Commercial Roofing Blog CT | Roofing Tips & Insights

Commercial Roof Maintenance Checklist: Prepare Your Building for Winter

Tue, 27 Oct 2026 13:12:54 GMT

Before a Connecticut winter, a commercial roof should be cleared of debris, have every drain, scupper, and gutter flowing freely, have its seams, flashings, and penetrations sealed, and have any soft spots, punctures, or ponding areas repaired while temperatures still allow. Rooftop equipment curbs, edge metal, and coping should be secured against winter wind, and a snow plan should be in place before the first storm. Fall is the last practical window to do this work: many membrane repairs, sealants, and adhesives need moderate temperatures and dry conditions that become hard to find after November.

International Roofing LLC is a commercial roofing contractor based in Berlin, Connecticut, and commercial roofing is all we do. We maintain, repair, and replace TPO, EPDM, PVC, modified bitumen, built-up, and metal roofs on warehouses, office buildings, retail plazas, manufacturing facilities, and multi-family properties across Central Connecticut and Hartford County, and we provide commercial roof snow removal in winter. This checklist reflects the pre-winter work our crews do every fall.

In This Guide

Why Fall Is the Deadline for Roof Maintenance : Temperature and timing.
The Pre-Winter Checklist at a Glance : Every task in one table.
Clear the Roof and Open Every Drain : The first priority.
Close Up the Membrane : Seams, punctures, and blisters.
Seal Flashings and Penetrations : Where winter leaks start.
Secure Edges and Rooftop Equipment : Wind and ice protection.
Plan for Snow Before It Falls : Access, removal, and monitoring.
Check Inside the Building : The roof from below.
Properties With Extra Winter Risk : Warehouses, retail, and more.
Who Should Do Pre-Winter Maintenance? : Staff vs. professionals.
Document Everything for Warranty and Insurance : Records that protect you.
Frequently Asked Questions : Quick answers.

Why Fall Is the Deadline for Roof Maintenance

Most commercial roof problems that show up in January started as small issues in September.

Materials Need the Right Conditions

Membrane welding, adhesives, primers, and sealants all have temperature and moisture limits. Many work best above roughly 40 to 50 degrees and on dry surfaces. Once Connecticut nights drop below freezing and roofs are wet with frost or snow, some repairs become temporary patches until spring.

Small Defects Grow in Winter

An open seam or a pinhole in flashing might let in a little water in October. In winter, that water freezes, expands, and works the opening wider. Meltwater during thaws then finds the same path. A repair that would have taken an hour in the fall can turn into ceiling damage, wet insulation, and a larger repair by March.

Contractor Schedules Fill Up

After the first major storm, every roofer in the region is responding to leaks. Scheduling maintenance in September and October means getting the work done on your timeline rather than waiting in an emergency queue.

The Pre-Winter Checklist at a Glance

Clear the Roof and Open Every Drain

If you only have time for one pre-winter task, make it this one. Flat and low-slope roofs depend on drains to move water, and winter makes every partial blockage worse.

What to Do

Remove leaves, branches, and debris from the entire roof surface, especially near parapets and inside corners.
Clear interior drains and check that drain strainers and domes are present and secure.
Flush scuppers and downspouts to confirm water moves freely all the way to the ground.
Clear overflow drains and overflow scuppers, which are your backup when primary drains freeze.
Look for ponding areas that have not drained within a couple of days after rain.

Why It Matters

A drain that is slow in October often freezes solid in January. Meltwater then pools and can back up under flashing at the low points of the roof. Our guide on how flat roofs drain explains how interior drains, scuppers, and gutters work together.

Close Up the Membrane

The roof membrane needs to go into winter without openings.

Single-Ply Roofs (TPO, PVC, EPDM)

Check seams and laps for separation, especially at corners and around penetrations. Look for punctures from foot traffic and dropped tools, shrinkage pulling the membrane away from walls and curbs, and surface cracking on older sheets. Patches on TPO and PVC are typically heat-welded, while EPDM repairs use compatible tapes and adhesives. Our comparison of TPO vs. EPDM explains how these systems differ.

Modified Bitumen and Built-Up Roofs

Look for blisters, splits, alligatored surfaces, and areas where granules or gravel have worn away. Open laps and cracked flashings should be repaired before cold weather makes the material brittle.

Soft Spots

Spongy areas underfoot usually mean wet insulation below the membrane. Wet insulation loses its insulating value, adds weight, and can freeze. It should be investigated and, if needed, replaced before winter.

If the Roof Is Near the End of Its Life

When repairs are adding up, fall is also the time to plan. A roof recoating , a roof overlay , or a spring replacement may make more sense than repeated patching.

Seal Flashings and Penetrations

Most winter leaks we respond to start at transitions, not in the middle of the roof.

Flashings

Check base flashing along parapet walls, curbs, and building walls for separation, open seams, and loose terminations. Inspect counterflashing and reglets for gaps where water can enter behind the flashing.

Penetrations

Inspect pipe boots, pitch pans, vent stacks, conduit penetrations, and skylight curbs. Sealant that looked fine in spring may have cracked over a hot summer. Pitch pans should be topped off with compatible filler.

Sealant Is a Maintenance Item

Caulk and sealant are not permanent repairs. Where the same flashing has been resealed several times, the flashing itself may need to be rebuilt.

Secure Edges and Rooftop Equipment

Edge Metal and Coping

Winter storms bring strong gusts, and loose edge metal is often where wind gets under the roof. Re-fasten loose sections and check joints in coping caps. Gaps at coping joints also let water run down behind the wall flashing.

HVAC Units and Curbs

Check that equipment curbs are properly flashed and that access panels are closed and secure. Make sure condensate lines drain where they should, not onto the membrane, where they can form ice.

Satellite Dishes, Signs, and Other Additions

Items added to the roof over the years are frequent sources of leaks and wind damage. Confirm they are anchored properly without penetrating the membrane in ways that were never flashed.

Walkway Pads and Hatches

Confirm walkway pads are in place along service routes, and that roof hatches open, close, and seal properly. Winter service calls and snow removal crews will rely on them.

Plan for Snow Before It Falls

You do not need to calculate snow loads in October, but you do need a plan.

Know Your Risk Areas

Snow tends to drift and pile up against parapets, around rooftop equipment, and on lower roof sections next to taller walls. Those are the areas that load up first in a heavy storm. Our snow removal team pays special attention to them after major storms.

Decide Who Will Respond

Identify who will monitor the roof after storms, when professional snow removal should be called, and how crews will safely access the roof. Having a contractor lined up before the season is far easier than finding one during a storm. Learn more about our commercial roof snow removal .

Protect the Membrane

Snow removal done carelessly can puncture or tear a roof. Plastic shovels, leaving a few inches of snow on the surface, and avoiding metal tools near seams and flashings help prevent damage.

Check Inside the Building

The underside of the roof often tells you more than the top.

What to Look For

Walk the top floor and look for stained or sagging ceiling tiles, damp or compressed insulation, rust on the steel deck or joists, and musty odors. Mark any stain on a simple roof plan so it can be matched to a location on the roof. Photos help too.

Why It Matters Before Winter

A slow leak you can live with in the fall can become a serious problem once ice dams and meltwater add volume. Finding it now gives you time to repair it before freezing weather.

Properties With Extra Winter Risk

Every flat roof needs pre-winter attention, but some buildings deserve a closer look.

Warehouses and Distribution Centers

Large, wide roofs collect a lot of water and snow, and a single blocked drain can affect a big area. Long spans also make it important to watch for ponding and deflection.

Retail Plazas

Multiple tenants often mean multiple HVAC units, signs, and penetrations added over the years by different contractors. Those additions are common leak points and should be checked one by one.

Manufacturing Facilities

Exhaust fans and process vents can discharge heat, moisture, or residue onto the roof. Those areas wear faster and can create localized ice in winter.

Multi-Family Buildings

Leaks in apartment buildings affect residents quickly. Roof drains, hatches, and areas above top-floor units should be prioritized.

Who Should Do Pre-Winter Maintenance?

Facility staff can handle simple tasks like checking interior ceilings and keeping an eye on drains after storms, if roof access is safe. Work on the roof itself, especially near edges, skylights, and hatches, involves fall hazards and should follow OSHA safety requirements. Membrane repairs, flashing work, and drain clearing at height are best handled by a commercial roofing contractor who can also document the roof's condition for your records.

Document Everything for Warranty and Insurance

Good records protect your roof investment.

Warranty Requirements

Many commercial roof warranties expect regular maintenance and may exclude damage caused by neglect. Dated photos and maintenance reports show the roof was cared for.

Insurance Claims

If winter weather damages the roof, a documented pre-winter inspection helps establish the roof's condition before the storm. Our guide to commercial roof storm damage covers what to do after severe weather.

Planning and Budgeting

Tracking repairs year over year helps you plan for recoating or replacement before a failure forces the decision. Our guides to commercial roof inspection cost and commercial roof replacement cost can help with budgeting.

Schedule Your Pre-Winter Roof Maintenance

If your building's roof has not been serviced since spring, now is the time. Our team can inspect the roof, clear drains, complete repairs while conditions allow, and document everything for your records. Learn more about our commercial roof maintenance and commercial roof repair services, or read our reviews .

Call International Roofing LLC at (860) 505-8506 or contact us . We serve commercial property owners and facility managers throughout Central Connecticut and Hartford County.

Frequently Asked Questions

How Do Flat Roofs Drain? Commercial Roof Drainage Systems Explained

Tue, 13 Oct 2026 12:46:03 GMT

Flat commercial roofs are not truly flat. They are built with a slight slope, often around a quarter inch per foot, that moves water toward one of three drainage paths: interior drains that carry water down through pipes inside the building, scuppers that let water out through openings in the parapet walls, or gutters and downspouts along the roof edge. Tapered insulation and crickets help steer water toward those outlets. When any part of that system is blocked, undersized, or pitched wrong, water collects in ponds, adds weight, wears out the membrane, and eventually finds its way inside.

International Roofing LLC is a commercial roofing contractor based in Berlin, Connecticut, focused entirely on commercial roofing. We install, repair, and maintain TPO, EPDM, PVC, modified bitumen, built-up, and metal roofs on warehouses, office buildings, retail plazas, manufacturing facilities, and multi-family properties across Central Connecticut and Hartford County. Drainage problems are among the most common issues we diagnose, and this guide explains how commercial roof drainage works and what goes wrong.

In This Guide

Why Flat Roofs Still Need Slope : How water is moved.
The Three Main Drainage Systems : Drains, scuppers, and gutters.
Interior Drains : How they work and fail.
Scuppers : Openings through the parapet.
Gutters and Downspouts : Edge drainage.
Tapered Insulation and Crickets : Shaping the roof.
Overflow and Secondary Drainage : The backup system.
Ponding Water: When Drainage Fails : Causes and risks.
How Roof Drainage Is Sized : Design basics.
Signs Your Roof Drainage Is Failing : What to watch for.
A Simple Drainage Maintenance Routine : Prevention.
Drainage in Connecticut Winters : Ice and meltwater.
Frequently Asked Questions : Quick answers.

Why Flat Roofs Still Need Slope

The term "flat roof" really means low-slope roof.

Minimum Slope

Building codes and roofing manufacturers generally call for a minimum slope on low-slope roofs, commonly a quarter inch of fall per foot, so water moves toward drains rather than sitting on the surface. That slope is barely visible, but it makes a big difference.

How Slope Is Created

Slope can be built into the structure, with the deck itself sloped, or created on top of a flat deck using tapered insulation boards. Many older Connecticut commercial buildings have structurally flat decks, so tapered insulation is often added during reroofing to improve drainage.

Why Some Roofs Drain Poorly

Roofs that were built dead flat, roofs where the structure has deflected over time, and roofs with added equipment or patched areas can develop low spots that hold water. These are often the first places to leak.

The Three Main Drainage Systems

Most commercial roofs use one or a combination of these systems.

Each has strengths and weaknesses, and the right choice depends on the building's size, shape, and structure.

Interior Drains

Interior drains are common on large commercial roofs because they can be placed in the middle of the roof where water naturally collects.

How They Work

A drain bowl is set into the roof deck at a low point, and the roof membrane is sealed to it with a clamping ring. A strainer or dome sits on top to keep debris out. Water flows into the bowl and down through drain pipes inside the building to the storm system. Because the pipes run through heated space, interior drains keep working in cold weather better than exterior outlets.

Advantages

Interior drains are protected from the weather, so they are less likely to freeze than exterior drainage. They are also out of sight and do not affect the building's appearance.

Common Problems

Clogged strainers from leaves, debris, and gravel.
Missing strainers, which lets debris enter the pipe and cause internal clogs.
Leaks at the clamping ring where the membrane meets the drain bowl.
Drains set too high, so water ponds around them instead of draining.
Damaged or disconnected interior piping that leaks inside the building.

Scuppers

Scuppers are openings through the parapet wall at roof level.

How They Work

Water flows across the roof to the parapet and out through the scupper. It usually drops into a collector box or conductor head mounted on the outside wall, then down a downspout.

Advantages

Scuppers are simple, visible, and easy to inspect. They are also commonly used as overflow outlets set slightly above the main roof level.

Common Problems

Scuppers can clog with debris and ice, and the flashing where the scupper passes through the wall is a common leak point. Undersized scuppers can also back up during heavy rain.

Gutters and Downspouts

Some commercial roofs drain off the edge into gutters, similar to a house but on a larger scale.

How They Work

The roof slopes toward one or more edges, where water runs into large commercial gutters and down through downspouts.

Advantages

Gutters are easy to access and inspect and are common on smaller commercial buildings, strip plazas, and multi-family properties.

Common Problems

Commercial gutters can clog, sag, or pull away from the building under the weight of ice and snow. Water overflowing at entrances can create ice hazards for tenants and customers.

Tapered Insulation and Crickets

Getting water to the drains is just as important as the drains themselves.

Tapered Insulation

Tapered insulation is installed in sloped boards that create a gradual pitch across the roof toward drains or scuppers. It adds insulation value while improving drainage, and it is one of the most effective ways to correct ponding on an older roof.

Crickets and Saddles

Crickets are small sloped sections that divert water around obstacles, such as rooftop HVAC curbs, or between drains. They are especially important behind large units and chimneys. Without crickets, water often collects on the uphill side of equipment and parapet walls.

When to Add Them

Tapered insulation and crickets are most often added during a full roof replacement or overlay. Our guide to what a roof overlay is explains when adding a new layer makes sense, and our commercial roof replacement page covers full replacement.

Overflow and Secondary Drainage

Primary drains can clog or freeze. Overflow drainage is the backup.

Why It Matters

If water cannot leave the roof, it builds up and adds weight. Building codes generally require secondary or overflow drainage on roofs with parapets or other edges that could trap water. Overflow drains or scuppers are set slightly higher than the primary drains so they only carry water when the main system cannot keep up.

Common Mistakes

Overflow scuppers that are blocked, covered during repairs, or set too high can leave a roof without protection when it is needed most. They should be inspected along with primary drains.

Ponding Water: When Drainage Fails

Ponding water is the most visible sign of a drainage problem.

What Counts as Ponding

The roofing industry generally considers water still standing on a roof about 48 hours after rain to be ponding. Small, shallow puddles that evaporate quickly are usually not a concern.

Why Ponding Is a Problem

Membrane wear. Standing water speeds up aging of many roofing materials.
Leaks. Ponds put constant pressure on seams and small defects.
Weight. Water is heavy, and large ponds add significant load to the structure.
Debris and growth. Ponds collect dirt and can support algae and vegetation.
Warranty issues. Some manufacturer warranties exclude damage from ponding.
Winter ice. Ponds freeze into ice sheets that stress the roof and create hazards for workers.

Fixing Ponding

Solutions include clearing and lowering drains, adding drains, installing tapered insulation or crickets, and correcting structural deflection. The right fix depends on why the water is collecting.

How Roof Drainage Is Sized

Drainage systems are designed, not guessed.

What Designers Consider

Roof drains, scuppers, and gutters are sized based on the area of roof they serve and the design rainfall intensity for the location, following the plumbing and building codes. Larger roof areas and heavier design storms require more or larger outlets.

Why Older Buildings Fall Short

Many older commercial buildings in Connecticut have been altered over the years. New rooftop equipment, additions, or reroofing can change how water flows, and drainage that once worked may no longer keep up. When a roof is replaced, it is a good time to have the drainage layout reviewed.

Adding Drains

Adding a new interior drain or scupper is a significant project involving the roof, the structure, and often interior piping. It is usually most practical during a replacement or major repair.

Signs Your Roof Drainage Is Failing

Watch for these signs on the roof and inside the building:

Water standing on the roof two days or more after rain.
Dirt rings or stains on the membrane where ponds have dried.
Vegetation or algae growing in low areas or around drains.
Water backing up at scuppers or overflowing gutters during storms.
Leaks near drains, scuppers, or along low parapet walls.
Ice buildup in the same areas every winter.
Interior stains directly below drain locations.

Any of these is a reason to have the drainage inspected before the next heavy storm or freeze.

A Simple Drainage Maintenance Routine

Most drainage problems can be prevented with routine attention. Check and clear drains, scuppers, and gutters at least in spring and fall, and again after major storms or heavy leaf drop. Make sure strainers and domes stay in place. Watch for ponding after rain and note any changes. Keep rooftop contractors from leaving debris near drains. A few minutes of attention a season can prevent the backups that cause most drainage-related leaks.

Drainage in Connecticut Winters

Winter is when drainage systems are tested hardest.

Frozen Outlets

Scuppers, collector boxes, gutters, and downspouts on the exterior of the building can freeze solid. When they do, meltwater backs up on the roof and can work its way under flashings.

Meltwater and Refreezing

Snow on a roof melts during sunny days and refreezes at night. If drains are blocked, that meltwater has nowhere to go and forms ice in low areas.

Preparing Before Winter

Clearing every drain, scupper, and gutter before winter is one of the most valuable tasks a building owner can schedule. Our commercial roof maintenance checklist explains the full pre-winter routine, and our team also offers commercial roof snow removal when snow builds up.

Drainage and Your Roofing System

Different membranes handle standing water differently, but none of them benefit from it. Single-ply membranes like TPO, PVC, and EPDM depend on sound seams, and ponding stresses those seams over time. Modified bitumen and built-up roofs can blister and deteriorate faster under water. Our comparison of TPO vs. EPDM and our pages on roofing systems explain how each material performs.

Get Your Roof Drainage Evaluated

If your roof has ponding water, slow drains, or recurring leaks near drains and scuppers, our team can inspect the drainage system, find the cause, and recommend a practical fix. Learn more about our commercial roof repair and roof maintenance services, or read our reviews .

Call International Roofing LLC at (860) 505-8506 or contact us . We serve commercial property owners and facility managers throughout Central Connecticut and Hartford County.

Frequently Asked Questions

What Is a Commercial Roof Overlay, and When Does It Make Sense?

Mon, 28 Sep 2026 19:21:29 GMT

Quick answer: A roof overlay, called a recover in the building code, means installing a new roof system directly over the existing one instead of removing it down to the deck. It typically costs meaningfully less than a full tear-off, skips the disposal and the demolition, and keeps your building operating with far less disruption. It makes sense on exactly one kind of roof: a structurally sound deck with dry insulation, no more than one existing roof covering, adequate drainage, and a structure that can carry the added weight. If any one of those is false, an overlay buys you a few cheap years and then costs you the tear-off anyway, plus the new roof you just paid for.

International Roofing LLC is a commercial-only roofing contractor in Berlin, Connecticut, serving property owners and facility managers across Hartford County and Central CT. We quote both recovers and tear-offs, and the reason we are specific about the disqualifying conditions below is that we have torn off plenty of failed overlays that never should have been installed.

In This Guide

What an overlay is, and what it is not

In a recover, the existing membrane stays in place. We install a new layer over it, usually with a cover board or separator and often with additional insulation, then rebuild the flashings, terminations, and drain details. You end up with a new roof system whose foundation is the old one.

Terminology causes real confusion in bid comparisons, so pin it down with every contractor:

Overlay or recover means a new system installed over the existing roof.
Tear-off or replacement means removing everything to the deck, repairing the deck, and building back up.
Reroofing is used by different companies to mean either of those, so it is a word to distrust in a proposal. Ask which one they mean.
Roof restoration or coating is neither. It is a fluid-applied membrane over a cleaned and prepped existing roof, which we cover in is silicone roof coating worth it .

The most important thing an overlay is not: it is not an inspection. Every problem under that old membrane stays under it, which is the entire reason for the conditions below.

When code allows a recover

Connecticut's State Building Code follows the International Building Code, which permits recovering but fences it with conditions rather than leaving it to preference. The general shape of the rules:

A recover is not permitted where the existing roof or the insulation beneath it is water-soaked or deteriorated, where the deck cannot support the new assembly, or where the building already carries two or more applications of roof covering. Certain existing coverings, including slate and clay or cement tile, are excluded from recovering entirely. The new system also has to be installed to the manufacturer's approved instructions, which effectively makes the membrane manufacturer's own requirements enforceable.

Two practical notes. First, the final word belongs to your local building official, and towns across Hartford County apply this with varying degrees of scrutiny, so the permit conversation should happen before you commit to a scope. Second, if a contractor proposes an overlay without asking how many layers are already up there, that is a question you should ask them.

The conditions that disqualify a building

Here is what we are actually checking when we assess a roof for recover eligibility:

More than one existing covering. Two layers already in place means tear-off, no discussion.
Wet insulation anywhere meaningful. Trapped moisture does not dry out. It corrodes steel deck, rots wood, destroys insulation R-value, and eventually finds its way into the new assembly.
A deteriorated deck. Rusted steel deck, spalling concrete, delaminated gypsum, or rotted wood needs to be seen and repaired, and you cannot see it through an overlay.
Inadequate structural capacity. If the framing has no margin for additional dead load, adding an assembly is not an option without engineering review.
Ponding water. An overlay follows the existing contours, so a roof that holds water today will hold water tomorrow at a slightly higher elevation.
Failed or undersized drainage. Drains, scuppers, and overflow provisions have to be reworked into the new assembly, and if the existing drainage was never adequate, a recover is the wrong time to leave it alone.
Extensive existing damage. Widespread blistering, splitting, or open seams mean the substrate you are building on is not stable.

One nuance worth knowing: partial removal is a legitimate middle path. When a moisture survey shows the wet areas are confined to, say, a quarter of the roof, we remove and rebuild those sections and recover the rest. That is often the best value on the table, and it almost never appears in a bid unless someone ran a survey first.

Why the moisture survey comes first

You cannot evaluate an overlay without knowing whether the insulation is dry, and you cannot know that by looking at the membrane. Wet insulation is usually invisible from the surface until the day it shows up on a ceiling tile.

There are three common ways to find it: infrared thermography, which reads the heat signature of wet areas after sunset, capacitance meters, and nuclear moisture gauges. Core cuts then verify the readings at specific spots and confirm exactly what layers are up there, which also answers the layer-count question for code purposes.

The survey costs a fraction of the roof, and it changes the decision more often than any other single input. We fold this into the assessment when an overlay is on the table, and our commercial roof inspection cost guide explains what a proper condition assessment includes.

Added weight and Connecticut snow load

This is where recovering a commercial roof differs fundamentally from shingling over a house, and where most of the online overlay advice does not apply.

A recover assembly adds dead load. Depending on what goes on, a new membrane with a cover board and additional insulation typically adds a few pounds per square foot. That sounds trivial until you put it on a mid-century industrial building framed with open-web steel bar joists designed to the standards of its era, then add Connecticut's ground snow load and the drifting that happens around parapets, mechanical screens, and roof-level additions.

The buildings where we look hardest at this are the ones with long joist spans, lightweight insulating concrete or gypsum decks, and prior roof work of unknown weight. When the margin looks thin, a structural engineer's review is the right call, and it is a far cheaper conversation than the alternative. The same load thinking applies during winter, which is why we treat roof snow removal as a structural service rather than a housekeeping one.

The energy code trigger nobody budgets for

Owners are routinely surprised by this one. Current energy code requires roof insulation to meet present-day minimum R-values when insulation above the deck is replaced, and the applicable threshold for our climate zone is considerably higher than what was installed on a building from the 1970s or 1980s.

What that means in practice is that the cheap version of an overlay, meaning a membrane laid over the old roof with nothing added, may not be the compliant version. Once insulation has to be brought up to current levels, you are adding board thickness, which raises material cost, raises the dead load discussed above, and raises every edge, curb, and drain on the roof, since flashing heights and drain assemblies all have to be extended.

None of that makes an overlay a bad idea. It does mean an overlay bid that is dramatically cheaper than the others may be quietly skipping insulation, and it is worth asking each bidder in writing what R-value they are delivering and how they are handling flashing heights.

Compatibility and separator layers

You cannot simply put any membrane on any existing roof. The most common Connecticut situation is a new single-ply going over an aged asphalt-based system, meaning built-up roofing or modified bitumen. Plasticizers and asphalt do not coexist well, so that assembly requires a separator sheet or cover board between the old and the new.

The same logic applies membrane to membrane. Recovering an EPDM roof with TPO, or the reverse, has specific manufacturer requirements, and skipping them is one of the fastest ways to void the warranty you are paying for. If you are weighing which membrane to put on top, our comparison of TPO and EPDM for commercial buildings covers how each performs in our climate.

Existing metal roofs are their own category and often good recover candidates, since a new system can be installed over the panels with the right sub-purlin or insulation approach. See our commercial metal roofing page for how we handle those.

Cost and service life compared

Roughly where the three paths land on a straightforward commercial building. Treat these as planning figures, not quotes.

The comparison that matters is cost per year of service, not sticker price. A recover on a qualified roof can deliver close to new-roof life at meaningfully less cost, which makes it the best value available. A recover on a roof with wet insulation delivers maybe five to eight years, and then you pay for the tear-off you avoided plus disposal of the system you just installed. That is the scenario that gives overlays their bad reputation, and it is entirely avoidable with a survey.

Warranty terms also differ. Manufacturer no-dollar-limit coverage is often available at a shorter term on a recover than on a tear-off, so ask for the specific term in writing rather than assuming parity. Our commercial roof replacement cost guide breaks down the full-replacement side of that math.

Overlay, coating, or tear-off

A quick way to orient before an assessment.

A coating fits a roof that is watertight or nearly so, with dry insulation and sound seams, where the goal is to extend life and reflect heat rather than rebuild the assembly. It is the least invasive and the least expensive, and it does nothing for drainage or insulation.

An overlay fits a roof at the end of its membrane life with a dry, sound substrate and only one existing layer, where you want new-roof performance without the disruption and expense of demolition.

A tear-off fits a roof with wet insulation, deck problems, two existing layers, structural constraints, or drainage that needs correcting with tapered insulation. It is also the right call when you plan to hold the building for decades and want the clock fully reset.

If your roof is actively leaking right now, none of these is the first step. Roof repair stops the water, and the capital decision gets made with a dry building and real data. And whichever path you take, a maintenance program is what determines whether the system reaches its rated life.

Find out which one your roof qualifies for

We will assess the existing assembly, run or arrange a moisture survey, take core cuts to confirm the layer count, look at the deck and the drainage, and tell you plainly whether your building is an overlay candidate. When it is not, we will show you why.

Call International Roofing at (860) 505-8506 or request an assessment . You can also review our commercial roof replacement and roof recoating services, or learn more about our commercial-only focus .

Roof overlay FAQs

TPO vs. EPDM Roofing: Which Is Better for a Commercial Building?

Mon, 14 Sep 2026 19:03:23 GMT

Quick answer: Neither membrane is better across the board, and for a Connecticut building the deciding factors are usually not the ones you will read about elsewhere. TPO gives you heat-welded seams that can be tested, repaired, and welded again years later, plus a reflective surface. EPDM gives you a long track record, excellent low-temperature flexibility, and fewer seams on wide-open roofs. The practical tiebreaker in our climate is seam serviceability in cold weather: a TPO seam can be hot-air welded on a January repair call, while EPDM seam tape and adhesives have minimum application temperatures that a Connecticut winter regularly falls below.

International Roofing LLC is a commercial roofing contractor based in Berlin, Connecticut. Commercial roofing is all we do, and we install and service both systems across Hartford County and Central CT, along with PVC, modified bitumen, built-up roofing, and commercial metal. That means we have no reason to push you toward one membrane, and we have been on enough 15-year-old roofs of both types to know how each one ages here.

In This Guide

What each membrane actually is

Both are single-ply membranes for low-slope commercial roofs, and both come in mechanically attached, fully adhered, and in EPDM's case ballasted configurations. That is where the similarity ends.

TPO

Thermoplastic polyolefin is a thermoplastic, which means it can be re-melted. Sheets are joined with a hot-air welder that fuses the two layers into a single mass, and the resulting seam is typically stronger than the field membrane itself. It is manufactured with a reflective white surface as standard, in thicknesses commonly running 45, 60, and 80 mil.

One piece of history worth knowing, because it still colors opinions: early-generation TPO from the late 1990s and 2000s had real formulation problems and some of those roofs failed prematurely. If someone in your organization remembers TPO badly, that is probably why. Current formulations are a substantially different product.

EPDM

Ethylene propylene diene monomer is a thermoset synthetic rubber, meaning it cures and cannot be re-melted. Sheets are joined with seam tape or adhesive rather than heat. It is black as standard, white is available at a premium, and it comes in wide rolls that cover large open areas with relatively few seams.

EPDM has been on American commercial roofs since the 1960s, so its aging behavior is thoroughly documented. It stays flexible at very low temperatures and handles thermal cycling well, which is exactly what a Connecticut roof does several hundred times a year.

Side-by-side comparison

The numbers in that table move with membrane thickness far more than with brand. A 45 mil roof and an 80 mil roof of the same product line are different purchases, and the thickness is where value engineering quietly happens when bids get compared on price alone.

Seams: the difference that matters most

If a single-ply roof leaks, the odds strongly favor a seam, a penetration detail, or a termination. Rarely is it a hole in the middle of the field. So how your membrane joins to itself is not a technical footnote, it is the main event.

A TPO weld is a fusion. Done correctly, at the right temperature and speed, the two sheets become one, and a technician can probe the seam with a hook to verify it on the spot. That testability is a genuine quality-control advantage during installation, and it means a future repair can be welded into the existing roof rather than adhered on top of it.

An EPDM seam is a bond between two cured surfaces using tape or adhesive. When the surface prep is right and the primer is applied properly, it performs for decades. When it is rushed, contaminated, or applied in marginal conditions, it becomes the maintenance item you revisit every few years. Older EPDM roofs installed before modern seam tape are the ones we most often find opening up along the laps.

This is also the reason we push back when an owner wants the cheapest bid on a roof with heavy rooftop equipment. More units means more flashings, more terminations, and more seams, and the seam system you chose becomes the thing you live with.

The Connecticut climate question

Every comparison article ends with the same line: TPO for warm climates, EPDM for cold ones. It is a tidy conclusion built on the idea that a black roof passively heats the building in winter. In our experience that reasoning deserves a much harder look on a Connecticut building.

The black-roof heating argument is weaker than it sounds

During the months when heating actually costs you money here, the roof is frequently under snow, the sun sits low and weak, and daylight hours are short. On top of that, current energy code puts a substantial layer of insulation between the membrane and the building, which is precisely the layer designed to decouple the roof surface from interior temperature. Whatever passive heat gain a black membrane delivers in January is largely intercepted by the insulation you are required to install underneath it.

Cool-roof requirements, meanwhile, are written mainly for the hot southern climate zones, so in Connecticut the reflective TPO surface is a choice rather than a code mandate. If your building has significant cooling load from process equipment, refrigeration, or a large conditioned interior, that white surface earns its keep in July. If your building is a warehouse with minimal cooling, it matters much less.

Winter serviceability is the argument that holds up

Here is what we notice every year. A roof takes a puncture in late January, which is also when snow removal crews and HVAC contractors are up there. On a TPO roof, we bring a welder and make a permanent repair in cold weather. On an EPDM roof, seam tape and adhesives have minimum application temperatures that Connecticut regularly sits below, so a proper permanent repair often waits for warmer weather while a temporary patch holds the line.

Neither system is disqualified by that. It is simply a real operational difference for a facility manager who needs same-week permanent fixes rather than a temporary patch and a spring callback. Our commercial roof repair work reflects that reality every winter, and it is worth weighing alongside our snow removal service , since foot traffic during snow events is a common source of the punctures in the first place.

Cost and lifespan expectations

Installed, both systems sit in the lower to middle part of the commercial range, with EPDM generally a little cheaper per square foot and TPO close behind. The insulation package, deck condition, and number of penetrations move a project budget far more than the choice between these two membranes. We break the whole picture down in our commercial roof replacement cost guide .

On lifespan, published expectations run roughly 20 to 30 years for TPO and 25 to 35 for EPDM, and both numbers assume something nobody advertises: that the roof gets inspected and maintained. A neglected 60 mil roof of either type will not outlive a maintained 45 mil one.

The maintenance that actually decides which of those numbers you get:

Clear the drains and strainers twice a year and after every major storm. Standing water is the fastest way to shorten either membrane.
Inspect the seams and terminations in spring and fall, since that is where both systems fail first.
Log and repair punctures promptly. A small puncture is a cheap repair and a wet insulation problem is not.
Control rooftop traffic. Walk pads at access points and around equipment prevent most of the damage we find on service calls.
Keep the paperwork. Most manufacturer warranties obligate you to document inspections, and a claim without records is a difficult claim.

When we specify neither one

Two situations come up often enough in Connecticut that they are worth naming.

If your building exhausts cooking grease, meaning a restaurant, a commercial kitchen, a food processing facility, or a tenant space with a hood system, both TPO and EPDM degrade on contact with animal fats and petroleum products. PVC is the membrane formulated to tolerate that exposure, which is why we specify PVC roofing on those buildings rather than trying to protect a TPO roof with splash pads.

If your existing roof is asphalt-based, meaning built-up roofing or modified bitumen , and you are recovering rather than tearing off, a separator or cover board is required between the old asphalt and a new single-ply. Putting a membrane directly on asphalt invites plasticizer migration and premature failure. We cover that in more depth in our guide to commercial roof overlays .

How to choose for your building

TPO usually wins when your building carries meaningful cooling load, the roof is crowded with HVAC units and penetrations where weldable detail work pays off, you want seams that can be probe-tested at installation, or you need permanent repairs available year-round.

EPDM usually wins when the roof is a large open expanse with few penetrations, the budget is tight and the building will be held long term, the deck and structure favor a ballasted assembly, or the building has low cooling demand and you value a membrane whose 40-year aging behavior is fully documented.

Either works when the roof is a straightforward low-slope deck on a conventional building, in which case the installing contractor and the maintenance program will determine the outcome more than the membrane will.

What to ask before you sign

Bids for these systems are easier to compare once you force the same disclosures:

Membrane thickness in mils , stated for each bid, since 45 and 60 mil are different products at different prices.
The insulation package , including R-value, board type, and whether a cover board is included.
Attachment method , meaning mechanically attached, fully adhered, or ballasted, and why that method suits your deck.
Warranty type and term. Ask specifically whether it is a manufacturer no-dollar-limit warranty or a material-only warranty, and what maintenance it obligates you to perform.
Who welds or seams. Manufacturer-certified crews are a warranty condition on most NDL programs.
What the drainage plan is. If your roof ponds today, a new membrane over the same slope will pond tomorrow unless tapered insulation is part of the scope.

Talk through your roof with us

We will walk your roof, look at the deck, the existing assembly, the penetrations, and the drainage, and tell you which system fits the building and the budget. If your current roof has more life in it than you think, we will say that too.

Call International Roofing at (860) 505-8506 or request an assessment . You can compare our TPO roofing systems and EPDM rubber roofing pages, see past commercial projects , or read what property managers say about working with us .

TPO and EPDM FAQs

Is Silicone Roof Coating Worth It for an Aging Commercial Roof?

Sun, 30 Aug 2026 04:14:50 GMT

For many aging but structurally sound commercial flat roofs, a silicone coating is well worth it. It seals leaks, creates a seamless waterproof surface that handles ponding water, reflects heat to cut cooling costs, and can add roughly 10 to 15 years of life, all at a fraction of the cost of a full replacement. It is not the right answer for a roof with wet insulation or structural damage, where replacement is the smarter investment.

At International Roofing LLC, commercial roofing is all we do, and we apply roof coatings across Connecticut and Hartford County. Based in Berlin, we help property owners and facility managers decide when a coating is the right move and when it only delays the inevitable. This guide lays out the real tradeoffs.

In This Guide

What Is a Silicone Roof Coating? : How it works.
The Benefits of Silicone Coating : Where it earns its keep.
The Downsides and Limits : What it cannot do.
When It's Worth It, and When It Isn't : Matching the fix to the roof.
Coating vs. Replacement Cost : How the numbers compare.
How a Silicone Coating Is Applied : The process in brief.
Silicone vs. Other Coatings : How it compares.
Silicone Coating and Connecticut Weather : Why it suits our climate.
Frequently Asked Questions : Quick answers for owners and managers.

What Is a Silicone Roof Coating?

A silicone roof coating is a fluid-applied membrane. Rather than tearing off the old roof, a roofer sprays or rolls a liquid silicone over the existing surface, where it cures into a seamless, waterproof layer bonded to the roof beneath. It is a restoration, not a replacement, designed to extend the life of a roof that still has good bones.

Silicone is especially well suited to flat commercial roofs because of how it handles standing water. Unlike some coatings that break down where water pools, silicone resists ponding water, which is one of the most common causes of failure on a flat roof. It goes over most existing systems, including aging TPO, EPDM, metal, modified bitumen, and built-up roofs, as long as the surface is sound.

The Benefits of Silicone Coating

When a roof is a good candidate, the advantages of coating over replacing are substantial. This is why coatings have become a standard tool for extending the life of commercial roofs.

Lower cost than replacement , often a fraction of the per-square-foot price of a full tear-off and reroof.
Seals leaks and existing seams , creating one continuous surface with no seams or fasteners for water to find.
Handles ponding water , since silicone holds up where standing water would degrade other materials.
Reflects heat , as a bright white coating lowers rooftop temperatures and can reduce summer cooling costs.
Less disruption and waste , because there is no tear-off, no dumpsters full of old roofing, and minimal interruption to the business below.

There is also a practical financial angle. Because a coating restores rather than replaces, it can often be treated differently from a capital replacement for budgeting purposes, and many coating systems come with their own manufacturer warranty. For a building owner trying to extend a roof a decade without a major capital outlay, those benefits add up quickly. The reduced disruption is worth emphasizing for occupied buildings, since a coating can often be applied while the business below keeps operating normally, with no tear-off noise, debris, or exposed roof deck to work around.

The Downsides and Limits

A coating is a restoration, and it can only restore a roof that is fundamentally sound. Knowing its limits is what separates a smart coating from money wasted on a roof that needed replacing.

The most important limit is what lies beneath the surface. If the insulation under the membrane is wet or saturated, a coating seals that moisture in rather than solving it, and the roof continues to deteriorate out of sight. A coating also cannot fix structural problems, significant membrane damage, or a roof at the very end of its life; it restores a surface, it does not rebuild a system. The existing roof has to be cleaned and prepared properly first, and any repairs made, or the coating will not adhere and perform. Finally, a coating is not permanent, and it will need to be recoated down the road, though that is a minor, low-cost step compared with replacement.

When It's Worth It, and When It Isn't

The value of a silicone coating comes down to the condition of the roof underneath. Running through the common scenarios makes the decision clear.

The pattern is simple: a coating is worth it when the roof is aging but still healthy underneath, and it is not worth it when the real problem is below the surface. An inspection that checks for trapped moisture is what tells you which situation you are in, and it is the step we never skip before recommending a coating.

Coating vs. Replacement Cost

The cost difference is the heart of why coatings are so appealing. A silicone coating typically runs in the range of roughly 1.50 to 4 dollars per square foot installed, while a full commercial roof replacement generally falls between 4 and 15 dollars per square foot. On a large roof, that gap represents significant capital.

The key is that the comparison only holds when the roof is a genuine coating candidate. Spending on a coating for a roof with wet insulation is not a saving, it is a delay that adds the coating cost on top of the replacement you will still need. When the roof qualifies, though, a coating buys a decade or more of life at a fraction of the price, which is why it is often the better first move for an aging roof. Our guide to commercial roof replacement cost lays out the replacement side of that comparison in detail.

How a Silicone Coating Is Applied

Understanding the process helps explain why preparation matters so much and why a coating is only as good as the work underneath it. A proper application is methodical, not just spraying liquid on a roof.

It starts with a thorough inspection, including a check for trapped moisture, to confirm the roof is a candidate. The surface is then cleaned, usually power washed, to remove dirt, debris, and anything that would keep the coating from bonding. Any existing damage, open seams, or failed flashing is repaired first, and seams and penetrations are often reinforced with a fabric or additional material for extra strength. A primer may be applied depending on the existing roof, and then the silicone is sprayed or rolled on to the manufacturer's required thickness, sometimes in more than one coat. Because the finished performance depends entirely on that prep and correct application thickness, this is not a job for shortcuts.

Silicone vs. Other Roof Coatings

Silicone is one of a few coating types, and it is worth knowing why it is often the choice for flat commercial roofs. The main alternatives are acrylic and urethane coatings, and each has a place.

Acrylic coatings are budget-friendly and reflective but tend to break down where water ponds, which is a real limitation on flat roofs that hold water. Urethane coatings are tough and handle foot traffic well, making them a good choice for roofs that see regular access. Silicone's standout strength is its resistance to ponding water and weathering, which is exactly the failure point that matters most on a flat roof, and it holds its waterproofing over time with minimal breakdown. The tradeoff is that silicone can hold dirt and become slippery when wet, and it requires its own products for any future recoat. For a flat commercial roof in a climate with real weather, silicone's ponding resistance is usually the deciding advantage.

Silicone Coating and Connecticut Weather

Our climate is hard on flat roofs, which makes the right restoration choice especially important here. Connecticut roofs deal with heavy rain, snow, and repeated freeze-thaw cycles, and the meltwater from snow often pools on a flat roof before it drains.

That ponding is precisely where many coatings and aging membranes fail, and it is where silicone's resistance to standing water pays off. A seamless silicone surface also removes the seams and fasteners that freeze-thaw works loose over a Connecticut winter. None of this replaces good drainage, and a roof with chronic ponding may need tapered insulation or drain work as part of the solution, but for an aging flat roof that still drains reasonably, a silicone coating is well matched to what our weather throws at it. It is also a restoration that can be scheduled in the milder months and then relied on through the following winter, which makes it a practical way to get an aging Connecticut roof through several more cold seasons without a disruptive tear-off.

Find Out If a Coating Is Right for Your Roof

A silicone coating can be one of the best values in commercial roofing, but only for the right roof. As Connecticut's commercial roofing specialists, we inspect the roof, check for hidden moisture, and give you a straight recommendation on whether coating or replacement is the better investment for your building.

Call International Roofing LLC at (860) 505-8506 or contact us for an assessment. Learn more about our commercial roof re-coating services across Connecticut and Hartford County.

Frequently Asked Questions

How Much Does a Commercial Roof Replacement Cost? (2026 Guide)

Sun, 30 Aug 2026 03:20:12 GMT

A commercial roof replacement typically runs somewhere in the range of 4 to 15 dollars per square foot installed, which means a mid-sized building often lands in the tens of thousands of dollars. The membrane you choose, the size of the roof, and whether the old roof is torn off or recovered are the biggest factors. Because every building is different, treat any figure as a ballpark until a roofer assesses your specific roof.

At International Roofing LLC, commercial roofing is all we do. Based in Berlin, Connecticut, we help property owners, property managers, and facility managers across Connecticut and Hartford County plan and complete roof replacements on commercial and industrial buildings. This guide breaks down what actually drives the cost so you can budget with realistic numbers.

In This Guide

What a Commercial Roof Replacement Costs : The overall range.
Cost by Roofing System : Prices by membrane type.
What Drives the Cost : The factors that move the number.
Tear-Off vs. Recover : Two ways to reroof.
Ways to Manage the Cost : Stretching your roofing budget.
How Long a Replacement Takes : Timeline and disruption.
Signs It's Time to Replace : Replace versus repair.
Frequently Asked Questions : Quick answers for owners and managers.

What a Commercial Roof Replacement Costs

Commercial roofing is priced per square foot, and for a full replacement the installed cost generally falls somewhere between 4 and 15 dollars per square foot. On a 20,000 square foot building, that spread translates into a very wide range, which is exactly why a single quoted number is meaningless without knowing the specifics of your roof.

The reason for the range is that a commercial roof is a system, not just a membrane. The price reflects the material, the insulation beneath it, the labor to remove the old roof, any deck repairs, and the complexity of the building. A simple, wide-open warehouse roof costs far less per square foot than a smaller roof crowded with HVAC units, drains, and penetrations. The figures below give you a realistic starting point, but an on-site assessment is the only way to get an accurate number. It also helps to think in terms of cost per year of service rather than sticker price alone, since a more expensive membrane that lasts ten years longer can be the better value over the life of the building.

Cost by Roofing System

The membrane is the single biggest driver of material cost, and each system carries a different price and lifespan. The ranges below are typical installed ballparks for a straightforward commercial roof and will shift with your building's size and complexity.

Metal roofing systems sit higher still, often in the range of 10 to 20 dollars or more per square foot installed, but they last much longer, so the cost per year of service can be competitive. The right system depends on your building, budget, and how long you plan to own it, which is a conversation worth having before you price anything.

What Drives the Cost

Beyond the membrane, several factors push a replacement toward the low or high end of the range. Understanding them helps you read an estimate and see where the money goes.

Roof Size and Complexity

Larger roofs cost more in total but often less per square foot, since crews work more efficiently over open area. Complexity works the other way: a roof packed with HVAC units, skylights, drains, and penetrations takes more labor and detail work, raising the per-foot price.

Tear-Off and Deck Repair

Removing the old roof adds labor and disposal cost, and once it is off, any damaged decking or wet insulation discovered underneath has to be replaced before the new system goes on. Hidden deck damage is one of the most common reasons a final cost lands above the initial estimate. A careful contractor accounts for this possibility upfront and, where the roof allows, may take core samples or use moisture scanning before the project so there are fewer surprises once the tear-off begins.

Insulation and Tapered Systems

Commercial roofs usually include insulation, and its type and thickness affect both cost and energy performance. Tapered insulation, used to build slope for drainage on a flat roof, adds cost but solves ponding problems that would otherwise shorten the roof's life.

Warranty and Code Upgrades

Longer manufacturer warranties often require specific materials and certified installation, which can raise the price but protect the investment. Bringing an older roof up to current building code, including added insulation or drainage requirements, can also add to the total.

Tear-Off vs. Recover

One of the biggest cost decisions is whether to tear off the old roof completely or install a new membrane over the existing one, known as a recover or overlay. A recover skips the tear-off labor and disposal, so it costs less and is faster, and it is often allowed when the building has only one existing roof layer and the substrate is dry and sound.

A tear-off costs more but is the right call when the existing roof has wet insulation, multiple layers already, or structural concerns, because covering those problems only traps them. Most building codes also limit how many roof layers a building can have, which can force a tear-off regardless of preference. For a roof that is aging but still fundamentally sound, a coating can be an even lower-cost way to extend its life, which we cover in our guide on whether a silicone roof coating is worth it . The best choice depends on the condition of what you already have, which an inspection determines.

Ways to Manage the Cost

A replacement is a major capital expense, but there are legitimate ways to control it and get the most from your budget. None of them involve cutting corners on the installation itself.

Act before the roof fails , since planning a replacement on your timeline is far cheaper than an emergency after leaks damage the interior.
Consider a coating for a sound aging roof , which can add years of life for a fraction of replacement cost and defer the larger spend.
Keep up with maintenance and inspections , because catching small issues early prevents the deck and insulation damage that inflates a replacement.
Match the system to your ownership horizon , choosing a longer-lasting membrane if you plan to hold the building for decades.
Get a thorough assessment , so the estimate reflects the real scope and you avoid surprises mid-project.

Regular attention to the roof is the throughline here. Our overview of commercial roof inspection costs explains how a modest inspection spend protects a far larger one. A documented maintenance history also strengthens any warranty claim and helps at resale, since a buyer or lender views a well-maintained roof as far less of a liability than an unknown one.

How Long Does a Commercial Roof Replacement Take?

For a facility manager, downtime and disruption matter as much as the price, so timeline is a fair part of the cost conversation. Most commercial roof replacements take anywhere from a few days to a few weeks, driven by the same factors that drive cost: the size of the roof, the system being installed, the weather, and the complexity of the building.

A modest single-membrane roof on a straightforward building can be completed in several days, while a large facility, a tear-off with significant deck repair, or a complex roof with many penetrations can stretch to two or three weeks. Weather is the biggest variable, since a safe, watertight installation cannot happen in rain or high wind, so a Connecticut project may pause and resume. A good contractor schedules the work to keep your operations running, staging the job so the building stays weather-tight and usable throughout, and builds a realistic timeline into the estimate.

Signs It's Time to Replace Rather Than Repair

Replacement is a major spend, so it is worth knowing when it is genuinely the right call versus continuing to repair. A few clear signals point toward replacement.

Widespread or recurring leaks , especially in multiple areas, which suggest the membrane has reached the end of its service life.
Wet or saturated insulation found during an inspection, which repairs and coatings cannot fix.
Age at or beyond the system's expected lifespan , where continued repairs become throwing money at a failing roof.
Extensive membrane deterioration , such as widespread cracking, blistering, or seam failure across the roof.
Rising repair frequency and cost , where the running total starts to approach the price of a new roof.

If your roof shows storm-related damage rather than age, the picture can be different, and our guide on commercial roof storm damage covers what to check. When the issue is age and wear, though, an assessment helps you weigh a replacement against another round of repairs.

Plan Your Commercial Roof Replacement With International Roofing

A commercial roof is one of your building's largest assets, and replacing it well protects everything underneath. As Connecticut's commercial roofing specialists, we assess your roof, walk you through the system options, and give you a clear, itemized estimate with no pressure.

Call International Roofing LLC at (860) 505-8506 or contact us for an assessment. Learn more about our commercial roof replacement services across Connecticut and Hartford County.

Frequently Asked Questions

Commercial Roof Storm Damage: What to Check After Severe Weather

Sun, 26 Jul 2026 22:12:00 GMT

After a severe storm, check your commercial roof for punctures and tears in the membrane, lifted or loose flashing, blocked or damaged drains, debris on the surface, ponding water, and interior signs like ceiling stains or leaks. The safest first step is a ground-level and interior check, followed by a professional inspection before you or anyone else walks the roof. Documenting the damage with photos right away is critical for insurance. Acting quickly keeps minor storm damage from turning into major water intrusion.

At International Roofing LLC, we inspect and repair commercial roofing systems across Connecticut, responding to storm damage on TPO, PVC, EPDM, modified bitumen, built-up, and metal roofs after the severe weather our region regularly sees. Because we handle these calls after every major storm, the checklist below reflects what actually matters most when assessing commercial roof damage here.

Start with the checklist, then work through what to look for and what to do.

In This Guide

The post-storm checklist : What to check, at a glance.
Signs of damage on the roof : Membrane, flashing, and drains.
Signs of damage from inside : Clues visible from the ground.
What causes commercial storm damage : Wind, hail, and debris.
Storm damage types at a glance : Damage, cause, and urgency.
Safe next steps after a storm : What to do and in what order.
Documenting damage for insurance : Protecting your claim.
Frequently asked questions : Quick answers to common questions.

The Post-Storm Checklist

Before the details, here is what to check after severe weather. Prioritize safety, and leave anything requiring roof access to a professional.

Your Post-Storm Checklist

Check interior ceilings and walls for new stains, drips, or leaks.
Look at the roof from the ground or a window for visible damage.
Clear and check drains and scuppers if safely accessible.
Note any debris that landed on or near the building.
Document everything with photos and dates.
Call a professional for a full roof-level inspection.

Working through this list right after a storm helps you catch damage early and start the insurance process on the right foot. The most important rule is to stay safe and off the roof itself.

Signs of Damage on the Roof

Storm damage to a commercial roof shows up in a few predictable places. A professional will check all of these safely from the roof, but knowing them helps you understand what to look for and what any inspection report is describing.

Membrane and Surface Damage

The roof membrane is the waterproof surface, and it is where wind and debris do the most visible harm. Punctures, tears, and lifted areas all let water into the roof assembly below.

Punctures or tears from flying debris.
Lifted or billowed membrane from wind uplift.
Bruising or splits from hail impact.

Even small breaches in the membrane can lead to significant water intrusion over time, which is why prompt assessment matters.

Wind uplift is especially damaging because it works from the edges inward. Once a corner or perimeter lifts, each subsequent gust can peel back more of the membrane, so what starts as a small loosened section can become a large exposed area if it is not secured quickly after the storm.

Flashing and Seam Damage

Flashing seals the edges and transitions where the roof meets walls, curbs, and penetrations, and it is a common storm casualty. High winds can lift or loosen it, opening a direct path for water into the building.

Seams between membrane sheets are another weak point. Storms can stress and separate seams, especially on older roofs, so these areas deserve close attention during any inspection.

Flashing and seams are also where damage is easiest to miss from the ground, since the change is often subtle rather than dramatic. A slightly lifted edge or a seam that has begun to open may look fine from below while already letting water track underneath, which is another reason a close professional inspection matters after a storm.

Drainage Problems

Storms often leave drains, gutters, and scuppers blocked with debris like leaves and branches. When drainage is compromised, water pools on the flat roof instead of flowing off as designed.

Ponding water adds weight and accelerates membrane breakdown, turning a drainage issue into a structural and waterproofing concern. Clearing and checking drainage is a key part of any post-storm assessment.

On a flat commercial roof, drainage is the whole ballgame, since there is no slope to shed water quickly. A drain clogged with storm debris can leave water standing for days, and that combination of added weight and constant moisture is one of the fastest ways to shorten a commercial roof's life.

Signs of Damage from Inside

You do not need to be on the roof to spot storm damage. Some of the clearest signs appear inside the building, where they are safe to check.

Interior Warning Signs

Water that gets past the roof shows up indoors, often before anyone sees the damage above. A walk through the top floor after a storm can reveal a lot, and it is the safest inspection you can do yourself.

New water stains on ceilings or walls.
Active drips or leaks during or after rain.
Bubbling paint or sagging ceiling tiles.
A musty smell signaling hidden moisture behind walls or above ceilings.

Why Interior Checks Matter

Interior signs are valuable because they are safe to check and they confirm that water has actually breached the roof. A stain that was not there before the storm is strong evidence of new damage.

Catching these signs early lets you get a professional assessment before a small leak damages inventory, equipment, or the building interior. In a commercial setting, that early catch can prevent costly business disruption.

It is worth checking the top floor and any spaces directly under the roof after every significant storm, even when the roof looks fine from outside. Water can travel along the underside of a roof deck and appear well away from the actual breach, so a stain in one spot does not always mean the damage is directly above it.

What Causes Commercial Storm Damage

Understanding what storms do to a roof helps explain what to look for. A few forces cause most commercial roof storm damage, and each leaves its own signature.

Wind and Uplift

High winds are one of the most common causes. Wind creates uplift forces that can loosen, lift, or peel back the membrane and flashing, especially at edges and corners where pressure is highest.

Once wind gets under the membrane or flashing, it can progressively worsen with each gust. This is why edges and corners deserve extra scrutiny after a windstorm.

Connecticut sees strong winds from nor'easters, thunderstorms, and the remnants of tropical systems, all of which can generate the uplift forces that damage flat commercial roofs. Buildings in exposed locations, or with older membranes nearing the end of their life, tend to see the worst of it.

Hail and Impact

Hail bruises and splits roofing membranes, sometimes in ways that are not obvious immediately but shorten the roof's life. Flying debris, from branches to loose materials off nearby structures, punctures and tears the surface on impact.

Rooftop equipment can become a hazard in high winds as well, since loose panels, vents, or units can shift and gouge the membrane. After a strong storm it is worth having an inspector check around all rooftop equipment, not just the open field of the roof.

Both leave physical damage that compromises the waterproof layer. Even when the harm looks minor from a distance, impact damage can create weak points that fail later, which is why professional assessment is worth it.

Storm Damage Types at a Glance

This table connects each type of damage to its cause and how urgent it is.

Anything letting water in, or an active interior leak, needs prompt attention. Hail bruising can be less obvious but still shortens the roof's life, so it is worth having assessed even when it looks minor.

Safe Next Steps After a Storm

Knowing what to do, and in what order, keeps a storm response safe and effective. The sequence matters as much as the actions, since rushing onto a damaged roof can turn a property problem into an injury.

Prioritize Safety First

Never walk a commercial roof after a storm to assess damage yourself. Wet membranes, hidden weak points, downed power lines, and structural uncertainty make it dangerous, and it should be left to professionals with proper equipment.

Do your checks from the ground, from windows, and from inside the building. If there is an active interior leak, contain it with buckets and move valuables, but do not attempt roof repairs yourself.

For a business, there is also a liability angle. Sending an untrained employee onto a storm-damaged roof puts both the person and the company at risk, so post-storm roof assessment is one task that belongs with insured professionals every time.

Call a Professional Promptly

After a major storm, schedule a professional inspection promptly, since roofers get busy quickly and hidden damage worsens with time. A qualified contractor can safely assess the full roof and identify damage you cannot see from below.

Prompt action can mean the difference between a simple repair and major water damage. Our commercial roof repair team responds to storm damage and can secure and repair the roof before the next weather event. For extensive damage, our roof replacement team can assess whether repair or replacement makes more sense.

A qualified contractor can also provide temporary protection, like tarping or sealing exposed areas, to prevent further water intrusion while a full repair or an insurance claim is arranged. In our climate, where storms can follow one another closely, that interim step often prevents a second round of damage.

Documenting Damage for Insurance

For a commercial building, the insurance process is a major part of storm recovery. Good documentation protects your claim, speeds up the outcome, and reduces the chance of a dispute over what the storm actually caused.

What to Document

Thorough documentation right after the storm strengthens your claim. The goal is a clear record of what happened and when, captured before any cleanup or temporary repairs change the scene.

Photos and videos of all visible damage, inside and out.
The date and details of the storm event.
Any interior damage to the building or contents.
Your inspection notes and the professional's report.

Working With Your Insurer

Report the damage to your insurer promptly and keep records of all communication. A professional inspection report documenting the storm damage supports your claim and helps establish that the damage was storm-related.

This is also where prior maintenance records help, since they show the roof was in good condition before the storm. Keeping up with routine roof maintenance and inspections gives you that baseline and makes storm claims far smoother.

Be aware of your policy's deadlines, too. Many commercial policies require that storm damage be reported within a set window, so acting promptly protects both the roof and your ability to claim. A professional report that clearly ties the damage to the storm event is often what keeps a claim moving without dispute.

Responding to Commercial Roof Storm Damage

After severe weather, check your commercial roof from the ground and inside for membrane damage, lifted flashing, blocked drains, and interior leaks, document everything for insurance, and call a professional for a safe roof-level inspection. Acting quickly keeps minor storm damage from becoming major water intrusion.

At International Roofing CT, we respond to commercial roof storm damage across Connecticut and help building owners assess, document, and repair it safely. When a storm hits, reach out to our team or learn more about our commercial roofing systems and services. We will help you protect your building before the next storm arrives.

Frequently Asked Questions

How Much Does a Commercial Roof Inspection Cost? (2026 Guide)

Sun, 26 Jul 2026 21:48:19 GMT

A commercial roof inspection typically costs somewhere in the low hundreds to around a thousand dollars for most buildings, with basic visual inspections at the lower end and detailed inspections using infrared or moisture scanning at the higher end. The biggest factors are the size of the roof, its complexity, the type of inspection, and accessibility. Many roofing contractors also offer free or low-cost visual inspections, especially when tied to maintenance or a suspected problem. Every number here is a ballpark, since your actual cost depends on your specific building.

At International Roofing LLC, we inspect, maintain, and replace commercial roofing systems across Connecticut, working with TPO, PVC, EPDM, modified bitumen, built-up, and metal roofs every week. Because we perform these inspections regularly on all kinds of commercial buildings, the ranges and factors below reflect how pricing actually works in our market, offered to set expectations rather than serve as a firm quote.

Start with the short answer, then see what drives the cost and what you get for it.

In This Guide

The short answer on cost : Typical ranges at a glance.
What affects the cost : The variables that move the price.
Types of commercial roof inspections : Visual, infrared, and more.
Inspection types at a glance : Type, detection, and cost.
What an inspection includes : What you are paying for.
When free inspections make sense : And when to pay for more.
Why inspections are worth the cost : Protecting a major asset.
Frequently asked questions : Quick answers to common questions.

The Short Answer on Cost

Commercial roof inspection pricing covers a wide range because inspections vary so much in scope. Still, most building owners want a starting number to plan around, so here is a realistic range before we get into the details.

Typical Ballpark Ranges

As a rough guide for a commercial building in our area, expect approximate figures like these:

Basic visual inspection: often free to a few hundred dollars.
Standard detailed inspection: typically in the low-to-mid hundreds.
Infrared or moisture-scan inspection: commonly several hundred to around a thousand dollars or more.

These are ballparks, not quotes. A small, simple flat roof and a large, complex roof with rooftop equipment can differ substantially for the same type of inspection.

Why the Range Is So Wide

The spread comes down to scope and building. A quick walk-and-look on a small roof is a very different job than a full moisture survey on a large industrial building with acres of membrane.

Roof size, the type of inspection, and how easy the roof is to access all move the number. The rest of this guide breaks those factors down so the ranges make sense for your property.

It also helps to separate two situations: a routine check on a roof you already own and maintain, versus a deep investigation tied to a leak, a purchase, or a replacement decision. The first is usually inexpensive or free, while the second justifies paying for more thorough methods.

What Affects the Cost

Understanding the variables helps explain why two quotes can differ and where your cost will likely land. A few factors do most of the work.

Roof Size and Complexity

The single biggest factor is the size of the roof, usually measured in square feet. A larger roof takes more time to inspect thoroughly and covers more area where problems can hide, which raises the cost.

Complexity matters just as much as size. A roof crowded with HVAC units, skylights, penetrations, and multiple levels takes longer to inspect than a simple, open flat roof of the same size.

The roofing system itself also plays a role. A single-ply membrane like TPO or EPDM is quicker to assess than a built-up or modified bitumen roof with multiple layers, and each system has its own common failure points an inspector needs to check.

Type of Inspection

The method drives a large part of the price. A basic visual inspection is the most affordable, while advanced techniques cost more because they require specialized equipment, training, and time to interpret the results.

Visual inspection: the most common and affordable option.
Infrared inspection: detects trapped moisture under the membrane.
Moisture surveys: map wet insulation across the roof.
Drone inspection: useful for very large or hard-to-access roofs.

Accessibility and Location

How easy the roof is to reach affects the labor involved. A roof with simple interior access through a hatch is quicker to inspect than one requiring special equipment to reach safely.

Height, the surrounding site, and safety requirements all factor in. A difficult or hazardous roof takes more time and precaution, which is reflected in the cost.

Safety compliance is not optional on commercial roofs, so an inspector may need fall protection, lifts, or additional crew to reach certain areas. Those requirements protect everyone involved but do add to the time and cost of a thorough inspection.

Types of Commercial Roof Inspections

Not all inspections are the same, and knowing the difference helps you choose the right one for your situation and budget.

Visual Inspections

A visual inspection is a trained professional physically examining the roof surface, flashings, drains, and penetrations for visible signs of damage or wear. It is the most common and affordable type.

This is often enough for routine checks and catching obvious issues. Many contractors offer these free or at low cost, particularly as part of maintenance or when you suspect a problem.

The value of a visual inspection depends heavily on the inspector's experience. A seasoned commercial roofer knows the specific weak points of each membrane type and can spot early warning signs that an untrained eye would walk right past, which is why who performs the inspection matters as much as the method.

Infrared and Moisture Inspections

Infrared inspections use thermal imaging to find moisture trapped beneath the roof membrane that is invisible from the surface. Moisture surveys map where insulation is wet across the roof, so repairs can target only the affected areas rather than the whole roof.

These detailed inspections cost more but are valuable for older roofs, leak investigations, or before a major decision like recoating or replacement. They reveal hidden problems that a visual check can miss.

Inspection Types at a Glance

This table compares the common inspection types by what they detect and their rough cost.

Most routine needs are covered by a visual inspection, with infrared and moisture surveys reserved for older roofs, leak hunts, and major decisions where hidden data matters.

What an Inspection Includes

Knowing what a proper inspection covers helps you judge whether a quote reflects real value or just a quick look.

The Core Checks

A thorough commercial roof inspection examines the whole system, not just the surface. A good inspector documents findings with photos and provides a written report you can actually use.

The membrane or surface for punctures, splits, blistering, and wear.
Seams and flashings where leaks most often begin.
Drains, gutters, and scuppers for blockages and proper drainage.
Penetrations around vents, HVAC units, and pipes.
Signs of ponding water that can shorten a roof's life and add weight.

On a flat commercial roof, drainage and ponding deserve special attention, since standing water accelerates membrane breakdown and adds weight. An inspector notes low spots and drainage problems that a pitched-roof inspection would never need to consider.

The Written Report

The deliverable that makes an inspection worthwhile is the report. It should document the roof's condition, note problem areas with photos, and recommend repairs or next steps.

A clear report lets you plan and budget, supports warranty and insurance needs, and gives you a baseline to track the roof's condition over time. Without it, an inspection is just a look.

When comparing inspection quotes, ask what the report includes. A one-line summary is very different from a detailed report with photos, condition ratings, and prioritized recommendations, and that difference often explains a price gap between two inspections that sound the same on paper.

When Free Inspections Make Sense

Free inspections are common in commercial roofing, and they have their place, but it helps to know when they are enough and when to invest in more.

When Free or Low-Cost Works

A free or low-cost visual inspection is often perfectly adequate for routine situations. It suits regular check-ins, a quick assessment of an obvious issue, or a general sense of the roof's condition.

Many contractors, including us, offer these because catching problems early benefits everyone. For a lot of routine needs, a professional visual inspection covers it.

One caveat worth knowing: a free inspection is often tied to a contractor hoping to earn repair or maintenance work. That is not a problem in itself, but it is worth getting the findings documented and, for major work, seeking a second opinion so the recommendation matches the roof's actual condition.

When to Pay for a Detailed Inspection

Paying for a detailed inspection makes sense when the stakes are higher. Before buying a building, investigating a persistent leak, or deciding on recoating versus replacement, the deeper data is worth the cost.

Infrared and moisture surveys find hidden wet insulation and subsurface problems that change major decisions. In those cases, the inspection cost is small next to the decision it informs. Our commercial roof maintenance program often bundles the right level of inspection into a regular schedule.

Due diligence before a property purchase is a classic example. Spending a few hundred dollars on a detailed inspection can reveal tens of thousands in hidden roof problems before you buy, which is exactly the kind of decision where the deeper inspection pays for itself many times over.

Why Inspections Are Worth the Cost

A commercial roof is one of a building's largest and most important assets, and inspections protect that investment for a relatively small cost. The math almost always favors inspecting.

Catching Problems Early

The main value of an inspection is finding small problems before they become big ones. A minor seam issue caught early is a cheap repair, while the same issue ignored can lead to interior damage and a costly emergency.

Regular inspections extend the life of the roof and prevent the surprises that disrupt a business. The cost of inspecting is minor next to the cost of a failed roof or an interior flood.

For a commercial building, a roof failure is rarely just a roof problem. It can mean damaged inventory, disrupted operations, and unhappy tenants, so the small, predictable cost of routine inspection buys protection against much larger and less predictable losses.

Supporting Warranties and Planning

Many commercial roof warranties require regular inspections and maintenance to stay valid. Skipping them can void coverage, turning a warranty claim into an out-of-pocket expense.

Inspections also let you budget and plan proactively rather than react to emergencies. If an inspection reveals the roof is near the end of its life, our commercial roof repair and replacement teams can help you weigh the options before a failure forces the decision.

Documented inspections also support insurance claims. If a storm damages the roof, a recent inspection report establishes the roof's prior condition, which can make the difference between an approved claim and a denied one. That paper trail is part of the quiet value an inspection provides.

Planning Your Commercial Roof Inspection

A commercial roof inspection usually costs from free for a basic visual check up to around a thousand dollars or more for detailed infrared or moisture work, driven mostly by roof size, complexity, inspection type, and access. For routine needs a visual inspection often suffices, while major decisions justify a deeper look.

At International Roofing CT, we inspect commercial roofing systems across Connecticut and give building owners clear, documented findings they can act on. When you are ready, reach out to our team or learn more about our commercial roofing services. We will recommend the right level of inspection for your building and goals.

Commercial Roofing Blog CT | Roofing Tips & Insights

Commercial Roof Maintenance Checklist: Prepare Your Building for Winter

In This Guide

Why Fall Is the Deadline for Roof Maintenance

Materials Need the Right Conditions

Small Defects Grow in Winter

Contractor Schedules Fill Up

The Pre-Winter Checklist at a Glance

Clear the Roof and Open Every Drain

What to Do

Why It Matters

Close Up the Membrane

Single-Ply Roofs (TPO, PVC, EPDM)

Modified Bitumen and Built-Up Roofs

Soft Spots

If the Roof Is Near the End of Its Life

Seal Flashings and Penetrations

Flashings

Penetrations

Sealant Is a Maintenance Item

Secure Edges and Rooftop Equipment

Edge Metal and Coping

HVAC Units and Curbs

Satellite Dishes, Signs, and Other Additions

Walkway Pads and Hatches

Plan for Snow Before It Falls

Know Your Risk Areas

Decide Who Will Respond

Protect the Membrane

Check Inside the Building

What to Look For

Why It Matters Before Winter

Properties With Extra Winter Risk

Warehouses and Distribution Centers

Retail Plazas

Manufacturing Facilities

Multi-Family Buildings

Who Should Do Pre-Winter Maintenance?

Document Everything for Warranty and Insurance

Warranty Requirements

Insurance Claims

Planning and Budgeting

Schedule Your Pre-Winter Roof Maintenance

Frequently Asked Questions

How Do Flat Roofs Drain? Commercial Roof Drainage Systems Explained

In This Guide ﻿

Why Flat Roofs Still Need Slope

Minimum Slope

How Slope Is Created

Why Some Roofs Drain Poorly

The Three Main Drainage Systems

Interior Drains

How They Work

Advantages

Common Problems

Scuppers

How They Work

Advantages

Common Problems

Gutters and Downspouts

How They Work

Advantages

Common Problems

Tapered Insulation and Crickets

Tapered Insulation

Crickets and Saddles

When to Add Them

Overflow and Secondary Drainage

Why It Matters

Common Mistakes

Ponding Water: When Drainage Fails

What Counts as Ponding

Why Ponding Is a Problem

Fixing Ponding

How Roof Drainage Is Sized

What Designers Consider

Why Older Buildings Fall Short

Adding Drains

Signs Your Roof Drainage Is Failing

A Simple Drainage Maintenance Routine

In This Guide

In This Guide