GAF Commercial Roofing Systems in Greenville, TX
A white TPO sheet gone chalky at the edge is telling you something. The top layer is wearing thin. On a GAF roof in Greenville, TX, that is the day to start pricing, not the day a ceiling tile stains.
GAF is a major roofing manufacturer, and its commercial line covers TPO and PVC single-ply, modified bitumen and polyiso insulation. We install, repair and maintain GAF systems on low-slope roofs. Here is how they behave in this climate, what the work costs and where we would steer you somewhere else.
What does GAF actually make for a commercial roof?
Three things matter on a flat roof. The EverGuard TPO and PVC membranes, the modified bitumen sheets, and the insulation and cover board that go under them. GAF sells most of the pieces, so one maker can supply the whole assembly from deck to surface.
That matters because a roof is a stack. Deck, vapor control, insulation, cover board, membrane, flashing. Swap one layer for another brand and the manufacturer may read the warranty differently. We tell you that up front, before the order goes in.
Single-ply is the usual pick for a plant or warehouse. The pick between TPO roofing and PVC roofing usually turns on what the building exhausts onto the roof and what the budget allows. Modified bitumen suits roofs with heavy foot traffic and lots of detail work.
How does a GAF sheet take a Greenville summer?
Slowly, and mostly from the top. July 2022 brought 27 triple-digit days to DFW, and a dark flat roof runs far hotter than the air on days like those. A sun-baked sheet stiffens. Laps and flashing carry the strain.
At a property in Park West or the Shelby Avenue district, set the inspection route from measured area, safe access and observed exposure. We look for chalking, shrunk sheet at walls and curbs, and welds that have lifted at the edge. A loose lap is a half-day repair. A neglected one turns into a wet deck.
If the surface is baked but the insulation is dry, a coating can stretch the life of the sheet. We core before we say so. Holcim Elevate, the Firestone line, sells competing sheets that face the same sun.
What will hail do to a GAF roof out by SH 380?
It bruises. The June 2019 storm that dropped baseball-sized hail on Greenville also pushed wind near 85 mph through town, and it collapsed a roof in downtown Greenville. A thin sheet over soft insulation takes that hit and cracks later in the season.
Dense cover board under the membrane gives the stones something to bounce off. A thicker sheet buys more time too. Neither makes a roof hail proof, and we will not tell you otherwise.
After a storm we press the field with a thumb, mark every soft spot and photo it. Our hail damage roof repair write-up gives you the fix-now number next to the fix-later number, with cores for the worst spots.
Fully adhered, mechanically attached or self-adhering: which fits the building?
Mechanically attached is the quickest and usually the cheapest. Fasteners and plates go through the sheet into the deck, so the deck has to be sound. Fully adhered costs more in labor, but it holds better in wind and gives a smoother surface.
Wind is the real test here. One April 2014 EF1 tornado, clocked near 105 mph, struck east of Merit, where it pulled metal roof and wall panels loose on a single structure out by FM 1569 and FM 903. Edge metal and perimeter attachment get the most attention on any job we scope.
Self-adhering modified bitumen sheets skip the torch, which can help near occupied surgical and women’s services areas in the I-30 and Joe Ramsey commercial corridor. We pick the method after we see the deck and the neighbors.
What moves the price of a GAF replacement?
Square footage sets the base. After that it is the tear-off, any wet insulation, deck repair, the number of curbs and drains, and how tight the staging is. Orbis operates a 1.03-million-square-foot plant on Shelby Avenue. Price mobilization from measured roof area, access and material requirements. A small roof with ten curbs does not.
Recover versus tear-off is the biggest swing. If a moisture survey shows dry insulation, a roof recover skips the dump and the labor. If it shows wet, a full commercial roof replacement is the right call.
We price the dry-in and the punch list as separate line items, so you see where the money goes.
For each GAF section, record the membrane family, attachment, cover board and details at curbs. That lets a repair quote identify the assembly under the work area instead of carrying assumptions from a neighboring roof section.
Who writes the warranty, and what do we put on paper?
GAF writes its own warranty terms, and the roof has to meet the spec to qualify. Review the current requirements in the issued document before you award the job.
What we do put on paper is the scope: the layers, the fasteners, the flashing details, the drain work and the photos at each stage. That record is what you hand to the next owner or the adjuster, and it is the same file roof warranty management keeps current.
Keep the approved assembly, required installer documents, inspection history and repair authorizations together. Before a later penetration or equipment change, check whether notice or a manufacturer-approved detail is required. Those records make the coverage requirements easier to confirm.
Commercial Roofing Questions
Should I put a new GAF system over a roof that is already leaking?
Find the leak first. Most leaks come from a flashing, a drain or an open lap, not the whole field. We scan the roof, mark the wet insulation and decide if a repair or recover buys another few seasons. If the deck is rotting, new membrane over it is money gone. Get the moisture map before you sign a scope.
Can a GAF TPO sheet go over my old modified bitumen?
Sometimes. The old roof has to be dry, firm and flat enough to take a cover board. We cut cores and run a moisture scan on any building before we say yes. Where it passes, you skip the tear-off and the dump fees. Where it fails, we write the tear-off number plainly and show you why.
My GAF roof is only bad in one corner. Do I patch or replace?
Patch if the rest of the sheet is supple and the insulation is dry. We probe the seams and press the field to check. A corner that keeps leaking after two repairs usually points to wet insulation or a flashing that has moved. Then a larger repair or a partial replacement costs less than a third visit.
How do I compare a GAF bid with a Carlisle or Firestone bid?
Line up the layers, not the brand names. Same insulation thickness, same cover board, same fastener pattern, same flashing details, same scope of tear-off. A cheaper number usually means a layer got dropped. We can price the same roof under Carlisle SynTec so you see both on one sheet.
What do you check after hail on a GAF roof in Commerce or Rockwall?
We start at the field and press for soft spots, then check every lap, drain and curb. Bruises get marked and photographed, and the worst spots get cored. Hail can differ block to block in Commerce or Rockwall, so one building tells you nothing about the next. You get a written report you can hand to your adjuster.