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Flat & low-slopeFree roof inspection with deck photos before we talk money - GAF and Owens Corning certified installation
GAF Roofing in Pomona, CA | Van Nuys Roofing Co
We provide independent GAF roofing service across Pomona, including the 91767, 91768, 91769, and 91797 ZIP codes, and GAF service in Walnut as well. The thing that makes our GAF work here different is simple: we know how Pomona’s older wood-frame homes and Santa Ana winds interact with GAF shingle systems. A lot of roofers will slap new shingles over bad sheathing and call it done. We won’t. Call (866) 321-6172 and we’ll give you a straight answer about your roof.
Why Pomona Residents Choose Us for GAF Service
While we also handle GAF in Covina, most Pomona roofers pick one brand and push it hard. We install and repair GAF, CertainTeed, Owens Corning, IKO, Atlas, Tamko, and Boral. That matters because when you ask whether a GAF Timberline HDZ is the right roof for your Craftsman bungalow, we’re not protecting a single supplier relationship. We’re telling you what we’d put on our own house. If it doesn’t need replacing, we won’t tell you it does. That’s how Rick Dominguez runs this crew, and it’s how we’ve earned a reputation in Pomona for being straight about repair versus replacement decisions.
We use GAF OEM shingles and accessories whenever they’re available. For older Pomona homes with original skip sheathing, we may recommend aftermarket underlayment and fasteners that meet or exceed GAF specs. We inspect first, recommend second. That means you don’t pay for a full re-roof when three shingles blew off in a wind event. And when the decking is truly compromised, we’ll show you the evidence before we touch your checkbook. Our GAF sales & service expertise covers everything from Timberline HDZ to Liberty SBS self-adhered.
Styles & brands we work with
Common GAF Roofing Problems We Solve in Pomona
- Wind-lift and missing shingles on Timberline HDZ after Santa Ana events. West-facing slopes in the 91767 flats take the brunt of it. We regularly see GAF Timberline HDZ roofs lose shingles not because the shingle failed, but because the original 1×4 skip sheathing underneath didn’t hold the nails. Replacing the shingle without fixing the decking means you’ll call us again next season.
- Granule loss and UV degradation on older composition shingles. Pomona’s inland sun is brutal. We see GAF composition roofs where granule loss exposes the asphalt mat, leading to thermal cracking long before the shingle’s rated lifespan. This isn’t a manufacturer defect; it’s what Pomona’s UV index does to any asphalt-based roofing product over time.
- Ridge cap blow-off and separation. On GAF roofs where previous installers never re-nailed the original 1×4 skip sheathing, ridge caps separate and lift. The caps themselves are fine. The nailing substrate is the problem. We address both when we repair.
- Premature failure of Royal Sovereign roll roofing on low-slope sections. Pomona has a lot of low-slope porch and garage roofs covered in GAF Royal Sovereign mineral-surfaced roll roofing. Inadequate underlayment combined with thermal expansion causes splitting and cracking. We replace these with properly fastened systems that account for Pomona’s temperature swings.
- Leak repairs tied to aging decking. Older Pomona homes with skip sheathing often have nails that have pulled loose over 70 or 80 years. We don’t just caulk the leak. We fix the decking so the repair actually holds.
GAF Service in Pomona: What Local Conditions Mean for Your Equipment
The single biggest factor in GAF roofing work in Pomona is the skip sheathing. Homes built before 1950 in the 91766 and 91767 ZIP codes often have original 1×4 boards spaced with gaps, not solid plywood decking. GAF’s installation instructions assume code-compliant nailing into solid substrate. When a new GAF shingle is nailed over skip sheathing that’s brittle, uneven, or simply missing gaps where nails should land, you get wind-lift exactly where Pomona’s Santa Ana winds hit hardest. We’ve been called out after wind events to the same 91767 flats homes multiple seasons in a row because a previous contractor shingled over bad sheathing and walked away. We re-nail the 1×4 boards, replace or overlay decking where needed, and only then install the GAF shingle system. That’s the difference between a roof that lasts and a roof that looks good for one season.
GAF Models & Products We Service in Pomona
We work with the full GAF residential line: Timberline HDZ, Timberline UHDZ, Royal Sovereign, and Liberty SBS Self-Adhered. Repair work gets GAF OEM shingles and accessories whenever we can source them quickly, and we stock common Timberline HDZ colors to keep Pomona turnaround times short. For older homes where original product lines are discontinued, we’ll match as closely as possible and tell you upfront what we’re using. Sub-services we handle on GAF roofs include shingle replacement, leak repair, and roof decking replacement. If your roof needs decking work, we don’t sub it out. One crew, one responsibility.
See the difference
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AfterGAF Service Pricing in Pomona
Our Roof Repair – Pomona services for GAF shingles typically run $275 to $650 for targeted wind-lift or leak repairs, depending on access, slope, and whether sheathing repair is needed. Full GAF Timberline HDZ roof replacement on a Pomona home generally falls between $8,000 and $18,000, with decking replacement adding $2 to $4 per square foot where skip sheathing has failed. Every estimate includes a written line-item breakdown and a free inspection of the existing decking. No change orders on our work. Call (866) 321-6172 for your free estimate, and we’ll give you a precise number for your specific house.
Serving Pomona, CA — Our Local Coverage Area
We’re based in the Pomona area and also offer GAF in La Verne, so we know this community well. Use the map below to see our service coverage — if you’re nearby, we can almost certainly help.
FAQs – GAF Roofing in Pomona
Yes, in most cases we can. If the skip sheathing underneath is still holding nails and the damage is limited to a section of shingles, a targeted repair makes sense. We’ll re-nail any loose sheathing boards, replace the damaged shingles with matching GAF product, and inspect the rest of the roof for hidden lift. If the decking is compromised across large areas, we’ll tell you honestly and recommend replacement. Call (866) 321-6172 to schedule an inspection.
For most Pomona homes, GAF Timberline HDZ is a solid choice. Its heavier construction holds up better to Santa Ana wind gusts, and the HDZ layer-lock system improves nail-holding when installed over properly secured sheathing. Timberline UHDZ is worth considering if you want maximum wind resistance and a thicker profile. But the shingle is only half the answer; on older Pomona homes, the sheathing work underneath matters just as much.
Yes. GAF Liberty SBS Self-Adhered is often the right product for low-slope porch, patio, and garage roofs in Pomona. We install it with proper adhesive primer and seam detailing, which is where most installations go wrong. If your existing low-slope roof has Royal Sovereign roll roofing that’s cracking from thermal expansion, we can quote both repair and full replacement options.
Original 1×4 skip sheathing creates gaps where nails can land without biting into wood. GAF installation specs assume solid or closely spaced decking, so skip sheathing must be re-nailed, and often overlaid with plywood or OSB, before new shingles go on. Skipping this step voids warranty eligibility and leaves the roof vulnerable to wind-lift. We include sheathing assessment in every free estimate.
Yes. We document the full installation or repair, including sheathing condition, product used, and photos, so you have what you need for manufacturer warranty eligibility. We’re an independent GAF service provider, not factory-authorized or manufacturer-affiliated, but we know what documentation GAF requires. Call (866) 321-6172 and we’ll walk you through what we provide.
Service Areas Near Pomona
Our Pomona service area covers the eastern San Gabriel Valley and nearby communities. We also handle GAF roofing in GAF service in Yorba Linda and GAF service in Claremont, plus surrounding neighborhoods. If you’re not sure whether we reach you, call and ask. We’ll give you a straight answer.
Book Your GAF Service in Pomona Today
We’ll come out, inspect your roof, and tell you what’s actually going on. Call (866) 321-6172 to schedule your free estimate. If it doesn’t need replacing, we’ll tell you that too.
Written by Rick Dominguez, Owner at Van Nuys Roofing Co, serving Pomona and the San Gabriel Valley.