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Commercial roofing: what changes when the deck goes flat

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Three workers in high-visibility vests installing white membrane on a flat commercial roof inside scaffolding

What the job involves

Commercial Roofing Services in Hartford, CT

What makes commercial different

A commercial roof deck is usually close to flat, not pitched like the roof over a house, and that one difference changes almost everything else about how the roof gets built, drained and kept watertight. A steep residential roof sheds water mostly through slope and overlapping courses of shingles — gravity does most of the work, and the roofing material's job is mainly to shed water fast enough that it never has time to find a way in. A low-slope commercial roof does not have that luxury. There is rarely enough pitch to move water off the surface quickly, so the roof surface itself has to be a continuous waterproof membrane rather than a series of overlapping pieces designed to shed rather than seal.

That distinction drives the drainage design too. Standing water on a low-slope roof accelerates membrane deterioration, so ponding is treated as a defect to correct through drainage or slope rather than a condition to coat over or ignore. On a pitched residential roof, a little water sitting after a rain is rarely a design problem — it runs off before it matters. On a commercial low-slope roof, where the surface is close enough to level that water can sit for a full day or more after a storm, drainage has to be engineered into the roof from the start: internal drains, scuppers, or a tapered insulation system that builds slope into an otherwise flat deck. Building that assembly correctly, from the deck up, is its own process — our new low-slope roof assemblies page covers that in full.

Rooftop equipment adds another layer that a typical house roof never deals with. Where a residential roof might have a chimney and a vent stack or two to flash around, a commercial roof routinely carries HVAC units on curbs, exhaust fans, conduit runs, and a walkway path for anyone servicing that equipment. Every one of those is a penetration or a point of foot traffic that has to be detailed and maintained separately from the open field of the roof, and the density of that equipment tends to scale with the size of the building rather than staying fixed the way a house's roof penetrations do.

Membrane systems in brief

Instead of overlapping shingle courses, a low-slope commercial section is usually covered in one continuous sheet membrane, seamed together across the field rather than layered course over course. EPDM, TPO, and PVC are the common single-ply options, and the choice between them comes down partly to how their seams get made. EPDM is a thermoset membrane, so its seams must be bonded with adhesive or seam tape, while TPO and PVC are thermoplastics whose seams are heat-welded instead — a welded thermoplastic seam, correctly made, is as strong as the membrane field itself. That is a real difference in how the roof gets built and later repaired, not just a manufacturing detail.

Seam chemistry is only one layer of the system, though. Insulation, cover board, and how the membrane is attached to the deck below it all affect how the finished roof performs, which is why membrane choice is a decision made alongside the rest of the assembly rather than picked on its own. A membrane well suited to a building with heavy rooftop equipment and foot traffic may not be the first choice for a building with none of that, and the reverse is just as true.

Rooftop equipment and access

Every piece of rooftop equipment is also an access point, and access points are where a commercial roof earns its reputation for being harder to keep watertight than a house roof. An HVAC unit sits on a curb that has to be flashed into the membrane on all four sides. A walkway pad protects the membrane field from foot traffic on the route technicians actually use to reach that unit, rather than relying on the membrane itself to hold up under repeated boot traffic. Conduit runs, exhaust fans, and roof hatches each add their own detail, and on a larger building those details can number in the dozens rather than the one or two penetrations a house roof typically carries.

Warranty coverage works differently on a system like this, too. A membrane roof's warranty is often tied to the installed system as a whole — the membrane, the insulation underneath it, and how the details around every piece of equipment were built — rather than covering the membrane material alone. That matters most once a roof starts showing its age: whether a given repair, coating, or partial replacement keeps an existing warranty intact, extends it, or voids it is a real question with real consequences, and it sits at the center of deciding whether extending the life of a roof that is still sound makes more sense than starting over. We walk through that decision in more depth on that page.

That density also changes how a roof gets checked over time. A house roof can usually be walked in a few minutes; a commercial roof with rooftop units scattered across it, tied together by walkway pads, simply takes longer to cover thoroughly, and more individual details means more places for a small failure to start going unnoticed between visits. None of that changes what causes a given leak — the underlying mechanics are the same at any scale — but it does change how much ground a walkthrough actually has to cover before anyone can call the roof sound.

None of this makes a commercial roof more failure-prone than a residential one by nature — it makes it a system with more individual details to get right, on a surface with less pitch to forgive a detail that was not. Understanding that distinction is most of what separates a commercial roofing conversation from a residential one before any specific service ever comes up.

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Commercial Roofing

Every commercial roofing service we cover

Through the year

How Hartford weather changes this job

Winter in Hartford

Ice dams build along the eaves when attic heat melts snow that then refreezes at the colder edge, backing water up under the shingles. Sustained snow load also stresses older framing and flat sections built with a lighter deck.

Spring in Hartford

Freeze-thaw cycling through late winter works ice into small cracks in flashing and sealant, so the first heavy spring rain is usually when a slow leak turns visible. Wind during spring storms lifts shingles that ice already loosened.

Summer in Hartford

UV exposure and heat cycling dry out asphalt shingles faster on south- and west-facing slopes. A roof that looked fine in June can show granule loss and curling edges by August.

Autumn in Hartford

The season for getting ahead of winter — gutters cleared, flashing checked, and a full inspection scheduled before the first hard freeze locks in whatever damage went unnoticed over summer.

What we handle

Roofing services in Hartford

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Where we go

Hartford and the surrounding towns

Hartford is the base; these are the neighboring communities our crews cover.

Hiring in one of these towns?

A separate guide for each town on what to check before you sign with any roofing contractor there — license and insurance, written scope, and what the warranty actually covers.

Straight answers

Common questions about roofing costs and service

Will homeowners insurance cover new gutters?

Gutter coverage depends on the policy and on how the need for new gutters came about — storm damage that cracked or tore a run off reads very differently to an insurer than gutters that simply wore out over the years, and an adjuster will usually want to see which of those two it actually was before approving anything. We work on commercial and low-slope roofs, where drainage more often means internal roof drains or scuppers than a gutter run along a fascia, so a residential gutter and insurance question is best directed to whoever holds that specific homeowners policy rather than answered in general here.

How can I remove an ice dam in Connecticut?

Ice dam removal is really a pitched-roof, shingle-and-eave problem, and this page covers low-slope commercial membrane roofs, which do not shed and refreeze water the same way a sloped residential roof does. If ice damming is turning up on a commercial building it usually points to something else going on with that roof's geometry or drainage, which is worth a direct look rather than a general removal method.

How much do new gutters cost for a 1500 sq ft house?

We don't have a verified pricing figure to offer, and house square footage isn't really the number that drives gutter cost anyway — linear footage of roofline, corner and downspout count, and material choice matter more, and none of those track cleanly with a single square footage figure. That's also a residential question outside what this page covers: commercial low-slope roofs typically move water through internal drains or scuppers built into the roof itself rather than a gutter run along the edge, which is a different sizing calculation entirely.

What is the best vinyl siding on the market today?

Siding is outside what we do — we focus on roofs, and on the commercial side specifically on low-slope and flat-roof systems rather than any wall assembly. What we can say is that a single 'best' siding claim rarely holds up across every building and climate the same way, which is the same caution worth applying to any roofing material marketed as a universal best choice: the right answer usually depends on the building it is going on, not a fixed ranking that applies everywhere.

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