Flat and low-slope roof replacement, that actually drains.
TPO, EPDM, and modified bitumen roof replacement for additions, porches, garages, and commercial buildings across Coweta County and the south side of metro Atlanta.
Griffintegrity Roof & Remod replaces flat and low-slope roofs on additions, porches, garages, and commercial buildings across Coweta County and the south side of metro Atlanta. This page covers low-slope roof replacement using membrane systems like TPO, EPDM, and modified bitumen, the materials we install alongside asphalt shingle, metal, and tile for the parts of a property that don't have enough pitch for standard roofing. We've served the area as a full-service roofing contractor for 10 years, including residential and commercial low-slope work.
Why can't you just install shingles on a flat or low-slope roof?
Shingles are designed to shed water down a steep enough pitch that it never sits on the surface, and a flat or low-slope roof doesn't give it anywhere to go fast enough. Water pools instead of running off, and it works its way under shingle laps and fastener holes that were never meant to hold up under standing water. That's why low-slope sections use membrane systems instead, sheets of TPO, EPDM, or modified bitumen that are sealed at the seams and built to handle water sitting on the surface until it drains. If a porch roof, addition, or garage on your property is flat or nearly flat, it needs one of these systems, not a shingle.
Signs your low-slope roof needs replacing
Standing water that doesn't drain
Water that sits on a flat roof for more than a day or two after rain means the drainage slope or the drains themselves aren't doing their job, and that ponding wears the membrane down faster.
Blistering, cracking, or seams pulling apart
Membrane roofing ages by cracking, blistering, or separating at the seams, and once the seams open, water gets underneath the whole system, not just one spot.
Leaks inside the room below
A low-slope roof over a porch, addition, or garage that's leaking inside usually means the membrane has failed somewhere on the surface or at a seam, not just at one obvious hole.
A membrane roof that's simply old
Low-slope membrane systems have a shorter service life than a steep-slope shingle roof, and one that's original to an older addition is often due even before it shows visible damage.
What we look at before recommending replacement
Drainage and slope
We check whether water is actually making it to the drains or downspouts, since poor slope is one of the most common reasons a low-slope roof fails early.
Membrane condition
We inspect the surface and every seam for cracking, blistering, and separation to judge how much life is left in the current system.
Decking and structure underneath
Standing water and old leaks can soften the decking below the membrane, and that gets checked and replaced as part of any low-slope re-roof.
Storm and impact damage
Hail and debris can puncture a membrane roof the same way they damage shingles, and that may fall under your insurance policy.
What to expect during the visit
We remove the old membrane and check the decking underneath for soft spots or damage before installing anything new. From there we install a new membrane system, TPO, EPDM, or modified bitumen depending on the application, sealing every seam and detailing the edges, drains, and any penetrations so water has nowhere to get underneath. We pay close attention to slope and drainage during the install, since standing water is what shortens the life of a low-slope roof in the first place. Timing depends on the size of the section and whether it's a residential addition or a larger commercial roof, and you'll get a clear timeline before we start.
Related services you may need
Low-slope sections are often part of a larger property that also has standard shingle or metal roofing, and we handle both under one roof, so to speak. If the same storm that damaged your membrane roof also hit the rest of the property, our Storm & Hail Damage Repair team can document everything together, and Gutters & Metal Fabrication can make sure drainage off the low-slope section ties in correctly with the rest of the gutter system.
The cost of waiting
A membrane roof with cracking seams or standing water doesn't stabilize on its own, it gets worse with every rain. Water that finds one open seam eventually finds the decking underneath, and a membrane replacement that could have been a controlled project turns into a decking repair and interior damage once it's been leaking a while. On a commercial building or an addition where the space below is in regular use, that delay costs more than the roof itself.
How long does a flat or low-slope roof replacement take?
It depends on the size of the section and whether it's residential or commercial, since membrane work involves careful seam sealing and drainage detailing. We walk you through a specific timeline once we've measured the roof.
What membrane options do you install on a flat roof?
We install TPO, EPDM, and modified bitumen systems on residential and commercial low-slope roofs, and we'll recommend the one that fits your application and budget during the inspection.
Can a flat roof be repaired instead of fully replaced?
Sometimes, if the damage is isolated to one seam or penetration and the rest of the membrane is still sound. Once a membrane is cracking or blistering across the surface, or standing water has been a recurring problem, replacement is usually the more lasting fix.
If a flat or low-slope section of your property is leaking or holding standing water, call Griffintegrity Roof & Remod for a free inspection. We install membrane roofing on additions, porches, and commercial buildings across Coweta County and the south side of metro Atlanta.
- Full tear-off and a new Owens Corning shingle or metal roof, installed by a crew that finishes most single-family homes in a single day.