Low-slope roofingfor the parts that don't shed water
TPO, modified bitumen and Polyglass cold-apply systems for flat and low-pitch roofs: on commercial buildings, and on the porches, additions and dormers that pitched-roof homes are full of.
Flat roofsare a different trade
A pitched roof keeps water out mostly with gravity. The shingles or panels slow the water down and the slope carries it away, so the covering never has to be genuinely watertight on its own. A low-slope roof does not get that help. The membrane is the waterproofing, and it has to hold with water sitting on it.
That single difference changes everything downstream: the materials, the way seams are joined, how penetrations are flashed, where drainage goes, and what maintenance the roof needs to reach its service life. It is why a good shingle crew is not automatically a good low-slope crew, and why TPO installation and Polyglass cold-apply systems are two of the topics we send our team to train on.
We install, replace and repair low-slope systems as standalone projects and as part of a full re-roof where a house has both.
Why low-slope roofsfail differently
Pitched roofs tend to fail in the field: granules wear off, panels loosen, the covering ages out. Low-slope roofs almost always fail at a detail: a seam that has lifted, a pipe boot that has hardened, a curb around an air handler, a drain that no longer drains. Water finds the one weak joint and then travels sideways under the membrane, so the stain on your ceiling is rarely under the actual hole.
Northeast Florida makes that worse in two directions at once. Frequent afternoon storms deliver water faster than a shallow roof can move it, and the sun then works on the membrane for the rest of the day. That combination is what turns a small detail failure into a wet roof assembly, and once the insulation under the membrane is saturated, patching it is no longer honest work.
Systems we installon low-slope roofs
Which one is right depends on the building, the drainage, what is already on the roof and how much foot traffic the surface gets. We price the realistic options rather than defaulting to whichever is easiest to install.
TPO single-ply membrane
A thermoplastic sheet rolled out over insulation and heat-welded at every seam, so the laps become one continuous surface rather than a glued joint. Its reflective white surface is why it is the default on flat commercial roofs in a climate like ours. TPO rewards precision, and it is one of the systems our crews train on with our suppliers every year.
Modified bitumen
An asphalt-based membrane reinforced with polyester or fibreglass and installed in plies, so the finished roof carries redundancy a single sheet does not. It is tough underfoot, forgiving around awkward penetrations, and a common choice where a low-slope section sees foot traffic for servicing rooftop equipment.
Polyglass cold-apply systems
Adhesive-applied build-ups that need no open flame on your roof, which matters on occupied buildings and anywhere a torch is a bad idea. These are specialty systems that require manufacturer-specific training, and we work directly with Polyglass so their products go down the way they intend.
Cold-apply systemsand the warranty behind them
Cold-apply and self-adhered membranes are the part of low-slope roofing that has changed most. A traditional built-up roof is installed hot, with a kettle and an open flame on your roof; a cold-apply build-up is bonded with adhesive, and a self-adhered sheet carries its own bond on the back of the roll. Nothing gets lit. On an occupied building (a daycare, a medical suite, a restaurant trading below) that is the difference between a roof you can do this week and one that needs a conversation with the fire marshal and the tenants first.
They are also less forgiving than they look. Adhesive systems care about surface preparation, about temperature and moisture on the day, about roller pressure and about the order the laps go down in. Get any of that wrong and the roof looks finished while the bond underneath is not. That is why these are manufacturer-trained systems rather than something a crew picks up on the job, and why our team trains directly with Polyglass on them.
Being a Polyglass Registered Contractor, registered contractor number 8557, is the other half of that. Registration is what allows us to offer Polyglass’s extended-term manufacturer warranties on qualifying systems and to register the warranty directly with Polyglass once your roof is on. Without it, an installer can buy the material and put it down, but the manufacturer warranty is not theirs to register. Ask for it in writing before you sign anything, on any low-slope roof, from anyone.
On houses
Covered porches, room additions, sunrooms, dormer tops, carports and patio covers are routinely framed too shallow for shingles. Homeowners are often surprised to learn they own a flat roof at all, right up until it leaks into the room below.
These sections are usually small, which makes them cheap to do properly and expensive to ignore. Where one is failing at the same time as your main roof, we handle both in one project.
On commercial buildings
Offices, medical suites, warehouses, daycares and retail buildings are mostly flat, mostly carry rooftop equipment, and mostly stay occupied while we work. Modified bitumen and TPO are the two systems we install most often on them.
We provide an installation schedule and plan before construction begins so tenants and property managers know what to expect and when.
Repair, coator replace?
Three different answers, and the right one depends on how far the roof has gone. A lifted seam or a failed penetration is a repair. A membrane that is aging but intact over a dry, sound assembly is often a coating candidate. A silicone coating adds years for a fraction of the cost of replacement. A saturated assembly is a replacement, and no coating will change that.
We inspect before we recommend, and you get the photos either way. Water testing and leak locating is its own skill on a low-slope roof, because the entry point and the stain are so rarely in the same place.
Other roofing servicesfrom the same crews
Flat roofs on apartment and condo communities run through our multi-family team, and owners with several buildings usually end up on a commercial maintenance programme rather than calling about one leak at a time.
Low-slope roofingquestions we get asked
Any roof shallow enough that water does not reliably run off it on its own: generally anything under about a 3-in-12 pitch, and certainly anything that looks flat from the ground. Shingle and metal manufacturers publish a minimum slope for their products, and below that line their warranties do not apply, which is why those areas need a membrane system instead. If you are unsure what you have, send us a photo and we will tell you.
Because most houses have at least one flat section even when the main roof is steep. Covered porches, room additions, sunroom and dormer roofs, carports and patio covers are frequently built at a pitch too shallow for shingles. Those areas are also where a surprising share of residential leaks start, so we treat them as their own system rather than an afterthought at the edge of a shingle job.
Because a low-slope roof holds water instead of shedding it. On a pitched roof gravity does most of the waterproofing and the covering only has to slow the water down; on a low-slope roof the membrane is the waterproofing, and every seam, lap, drain, curb and penetration has to hold under standing water. Ponding, ultraviolet exposure and thermal movement work on those details year after year, which is why low-slope roofs fail at the joints long before the field of the membrane wears out.
Often we can repair it. Membrane patching and coating work on low-slope and flat sections is one of the repairs we perform most, and a localised failure at a seam or a penetration is usually a repair rather than a re-roof. Where the membrane is failing across the whole field, or water has already got into the insulation below, replacement is the honest answer, and we will show you the inspection photos that led us there.
Frequently, yes. For an aging roof that carries a hefty price tag to replace, a silicone coating can extend the roof's life at a fraction of the cost of replacement, provided the deck and insulation underneath are still sound. It is not a fix for a saturated roof assembly. We inspect first and tell you which of the two your roof is a candidate for.
Yes. Shingle, metal, modified bitumen and TPO are all systems we install commercially, and we have worked in occupied buildings often enough to know the schedule matters as much as the roof. You get an installation plan and a timeline before anyone shows up so you can tell tenants what to expect.
Yes. We work with all county, city and municipality building departments across Northeast Florida for permits, and we will never perform unpermitted work on your property. Small repairs may fall under the threshold your building department sets, but anything that reaches it gets permitted and inspected.
Water sitting on your roof?We'll find where it's getting in
Call or text us about a flat or low-pitch section and we'll get out to inspect it. Free estimate, photos of what we find, and a straight answer on repair, coating or replacement.
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