Free written scope consultation - allowances, timeline, and change-order rules on paper before a single trade is scheduled
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AfterGAF Construction in Houston, TX | Rowan Construction Group
We provide independent GAF roofing, waterproofing, and construction service across Houston, from Heights bungalows to Sugar Land tract homes. The one thing that makes our GAF work different here is that we plan every roof around Houston’s expansive clay soils, Chapter 42 lot rules, and post-Harvey floodplain codes, not just the shingle warranty. Call (470) 298-9650 for a written price before any work starts.
Since 2007, Rowan Construction Group has paired GAF’s Timberline HDZ shingles, EverGuard TPO membrane, StormGuard and WeatherWatch leak barriers with the wind and moisture realities of the Gulf Coast. We’re an independent GAF service provider, not manufacturer-affiliated or authorized, which means we specify what the roof actually needs, not what a factory program tells us to push. Grant Rowan, our owner, trained in construction technology at Los Angeles Trade-Technical College and has spent two decades on residential and light commercial work where the substrate matters more than the surface. We serve the full Houston service area, and you can read more about our broader GAF sales & service work here.
Why Houston Residents Choose Us for GAF Service
Houston homeowners don’t get to pick their weather. Fifty-plus inches of rain a year, hurricane-force wind events, and a heat index that sits above 110°F from June through September put real stress on every roofing component. We know which GAF products hold up under those conditions and which details fail first. Our crews have re-coursed Timberline HDZ shingles on gable ends in the Heights, replaced EverGuard TPO at parapet walls in the Energy Corridor, and re-flashed valleys on post-Harvey elevated homes in Meyerland.
What you get from us is documentation, not promises. Every GAF service visit includes a photo record of what we found and what we did. Every quote is a flat written price with a written scope and written warranty. Under Clause 1 of the Haven Standard, the price is written before anyone starts. No change proceeds without a signed change order. That’s the discipline that has kept our project costs within a few percent of the agreed number across 4,000-plus jobs since 2007.
Common GAF Construction Problems We Solve in Houston
- Lifted or torn Timberline HDZ shingle tabs after wind events. Houston’s hurricane-force gusts hit gable ends and roof-to-wall intersections hardest because roof geometry accelerates uplift there. We see the same failure pattern across the inner loop and Katy alike, and the fix is rarely just replacing the tab. It’s usually a starter-strip and fastener problem underneath.
- EverGuard TPO wrinkling and adhesive failure at parapet walls and curbs. Houston’s humidity and daily thermal cycling trap moisture at these details. The membrane expands, the adhesive lets go, and water finds the seam. We cut out the failed section, dry the substrate, and re-weld with TPO that’s rated for high-humidity exposure.
- Cracking and granule loss along the first course of shingles. Clogged gutters and missing drip edge let water wick back under the first course. The fiberglass mat decays, granules shed, and the shingle cracks. This shows up constantly on 1980s slab-on-grade homes in Pearland and Clear Lake where gutters haven’t been cleaned in years.
- Leak-barrier failure at valleys and eaves during sustained downpours. StormGuard and WeatherWatch are good products, but when they’re installed over wet or dirty decking, they don’t bond. Houston’s low-slope additions on 1980s tract homes concentrate water at valleys, and a failed barrier there means water in the soffit within one season.
- Fastener grip loss in humid, high-wind conditions. Harris County humidity corrodes fasteners and loosens their hold in decking. When multiple fasteners have lost grip across a roof plane, chasing individual leaks stops making sense. We recommend replacement, not patchwork, and we’ll show you the photos to prove why.
BeforeAfterGAF Service in Houston: What Local Conditions Mean for Your Roof
Houston is the only major U.S. city without traditional zoning, which means our GAF roof replacement crews routinely coordinate with Chapter 42 lot-platting rules and deed restrictions that set maximum ridge heights and eave setbacks, especially in deed-restricted suburbs like Sugar Land. A standard GAF Timberline HDZ roof on a 1990s brick-veneer tract home can require custom fascia-to-wall flashing details that a Houston Fence Installation specialist or a Dallas or Austin roofer would never have to think about. These deed restrictions often limit how much we can raise the ridge when adding ventilation or insulation at the eave line, so the flashing has to respect the existing geometry. It’s not harder work, but it’s different work. You want a crew that has already read the deed restrictions in your subdivision and factored them into the written quote before the tear-off starts.
One more Houston-specific reality: the expansive black clay under most of the city doesn’t move your roof directly, but it moves your walls, and your roof is tied to your walls. When a slab heaves in Katy or a pier-and-beam bungalow in the Heights settles unevenly, the roof plane distorts - the same ground movement that can crack Driveway & Pavers - Houston homeowners know well. That distortion is where GAF shingle seals break and TPO seams open. We’ve seen more failed seams caused by structural movement than by product defects. That’s why our GAF service includes looking at what the roof is attached to, not just what’s on top of it.
GAF Models & Products We Service in Houston
We work on the full GAF residential and commercial lineup that Houston builders actually use. That includes Timberline HDZ shingles, EverGuard TPO membrane, StormGuard film-surfaced leak barrier, and WeatherWatch mineral-surfaced leak barrier. For these active product lines, we specify genuine GAF accessory components, leak barriers, ridge vent, and starter strip, so the shingle warranty’s system requirements stay intact. For older discontinued GAF lines, we use high-quality aftermarket sealants, underlayments, and flashing materials that meet or exceed Miami-Dade wind-driven rain standards. We keep common GAF fasteners, sealants, and flashing stock on our trucks, which means most Houston repair visits are one trip, not two.
And the brands we stock aren’t a coincidence. We source across fifty-plus vetted material brands because the written quote should reflect honest numbers for what the roof actually needs, not whatever one supplier had on the shelf that month.
GAF Service Pricing in Houston
Here are the price ranges we quote for GAF roofing work in Houston. These numbers are for the roof system itself, structural decking repairs and Chapter 42 compliance work fall outside them.
| Service | Price Range |
|---|---|
| Roof Replacement | $8,000-$20,000 |
| Roof Repair | $400-$1,800 |
| Metal Roof Installation | $15,000-$40,000 |
What drives the cost: roof size, pitch, decking condition, number of existing shingle layers, and whether Harris County floodplain rules trigger substantial improvement requirements. Your free estimate includes a written scope, a flat price, and a written warranty. Call (470) 298-9650 for an exact quote. Estimates are free, and we’ll review any competitor’s written quote line by line at no charge.
Serving Houston, TX - Our Local Coverage Area
We’re based in the Houston area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs - GAF Construction in Houston
In most cases, no. Skip sheathing, the spaced 1x boards common on pre-1940s Houston bungalows, doesn’t provide the continuous nailing surface that Timberline HDZ shingles require to hold their wind warranty. Installing over skip sheathing usually means the shingle tabs can flex between the boards and tear in a wind event. The correct approach is to sheath over the skip boards with plywood or OSB before the underlayment goes down. That adds cost, but it’s the difference between a roof that survives the next hurricane and one that loses its first course of shingles. Call (470) 298-9650 and we’ll inspect your decking and give you a written plan with a fixed price.
It means a reroof may not be just a reroof. If the structure has been flooded and the cost of your repairs or improvements exceeds 50% of the assessed value, Harris County requires the entire building to be brought into current floodplain compliance, including elevating to the new Base Flood Elevation plus freeboard. If your reroof is part of a larger remodel that crosses that 50% threshold, you may be looking at a whole-house lift, not a shingle swap. We flag this before you spend money, not after the permit office does. Call (470) 298-9650 and we’ll help you figure out where your project sits relative to that line.
Yes, EverGuard TPO is designed for exactly those conditions, but installation quality matters more than the product. Houston’s humidity attacks TPO at every seam and curb detail where the membrane was welded over dirt, moisture, or unprimed substrate. We see intermittent standing water on low-slope commercial roofs across the city, and the TPO handles it fine when the seams are clean and the flashing details are correct. When they’re not, the membrane fails in two or three seasons. If you have a flat roof that’s holding water, call (470) 298-9650 and we’ll tell you whether it’s a repair or a re-weld job. The inspection and estimate are free.
Usually yes. Tile roofs in Sugar Land often only lose a field of tiles in the impact zone, not the entire roof. We can match the tile profile and color, replace the broken pieces, and inspect the underlayment beneath them for cracks the hail left behind. The underlayment is usually the real question. If the tile is cracked but the underlayment is intact, the repair is straightforward. If the underlayment is compromised, that section needs to be stripped and re-laid before new tile goes on. Call (470) 298-9650 and we’ll inspect the roof and give you a written repair scope with a flat price.
The difference is almost never the shingle. It’s the installation: missing starter strip, fasteners driven too high or at the wrong angle, insufficient nails per shingle, or a decking surface that lost its grip from moisture. Houston’s high humidity and repeated thermal cycling loosen fasteners over time, and when the wind hits a gable end or a roof-to-wall intersection, the weakest fasteners let go first. We see this pattern on homes throughout Harris County, and the fix is usually a re-course of the affected slope with correct fastening, not a new shingle line. If you’ve lost shingles, call (470) 298-9650 for an inspection and a written repair quote.
Service Areas Near Houston
Our crews work across Harris County and the surrounding metros. We serve Houston, Katy, Pearland, Sugar Land, and Clear Lake. If you’re in our GAF service in San Antonio territory or closer to GAF service in San Diego, we can point you to the right team or schedule a Houston-based crew where coverage allows.
Book Your GAF Service in Houston Today
If your GAF roof needs attention, don’t guess. Call (470) 298-9650 and we’ll schedule an inspection, write a flat price, and show you exactly what needs to be done before any work starts. Same-day response is available for storm damage calls. Your roof deserves a plan, not a patch.
Written by Grant Rowan, Owner at Rowan Construction Group, serving Houston since 2007. Measure twice, say it once, show your work.