Owens Corning Attic Air Sealing: The Georgetown Owner’s Guide
We stock and install Owens Corning-compatible attic air sealing systems in Georgetown, with most residential jobs running between $1,200 and $2,800 depending on attic square footage and penetration count. Same-day service is available when you call before noon, and we carry Owens Corning Foamular rigid foam board, ProPink sealing accessories, and compatible one-part foam on every truck. Most Georgetown homeowners discover their attic air sealing has failed when they notice rooms that won’t stay cool in July despite new insulation, or when their HVAC runs continuously during our 100-degree stretches without ever cycling off.
Which Owens Corning Models This Applies To
Owens Corning does not sell a standalone “attic air sealing kit” under a single model number. Instead, their building science approach combines Foamular NGX rigid foam board (the 150 and 250 psi densities most common in residential work), ProPink L77 loose-fill as the cap layer, and proprietary AccuFit or IntuSeal accessories for top-plate and penetration sealing. The compatibility gotcha in Georgetown’s 2015-2025 builds is this: many attics were pre-cut for Foamular 150, but the builder spec’d 3/4-inch when 1-inch was required by 2018 IECC code for our Climate Zone 2. We check this on every job.
To identify what you have, look for the pink Foamular boards on your attic floor or against the hatch. The density rating and thickness are printed in black ink every 24 inches. If you see yellowed, crumbling foam or boards that have pulled away from framing, that’s your failure point. For OEM-versus-aftermarket: Owens Corning Foamular is a closed-cell XPS product with a stated R-5 per inch at 75°F mean temperature. Aftermarket XPS from other manufacturers runs closer to R-4.7 per inch and can off-gas differently in Georgetown’s 140°F attic peaks. We source Foamular directly through Owens Corning distribution, though we also stock Johns Manville, Knauf, and Rockwool equivalents when the job calls for it. Topside Attic Insulation Georgetown is an independent service provider, not affiliated with Owens Corning.
Signs Your Owens Corning Attic Air Sealing Is Failing
- Uneven room temperatures upstairs. When Foamular boards shrink at the seams or pull away from top plates, conditioned air escapes into the attic at the rate your blower-door test will quantify. We regularly find 800 CFM50 or more leaking through attic bypasses alone in Georgetown homes built between 2016 and 2020.
- Ice damming or moisture staining on ceiling drywall. Warm, humid interior air hits cold roof sheathing in winter, condenses, and stains the drywall below. In Georgetown’s variable winters, this shows up as ring-shaped stains around can lights and bath fans where the air seal failed first.
- Insulation that looks settled or disturbed near penetrations. If your ProPink cap layer has a “blow hole” or bare spot around a duct chase or plumbing vent, the underlying Foamular or one-part foam seal has cracked or never fully adhered. Rodents exploit these gaps; we document them with thermal imaging.
- HVAC runtime exceeding 18 hours daily in summer. Your unit is replacing air that’s leaving as fast as it’s cooled. A properly sealed Georgetown attic with updated air sealing typically drops cooling runtime by 25-35% measured across a full August billing cycle.
- Dust accumulation on attic-side surfaces. Air leaks carry household dust into the attic, where it deposits on the cold side of the Foamular or on roof decking. If your attic looks like a vacuum bag tore open near a top plate, you have a significant bypass.
Before
AfterReplacement Cost & What’s Included
Most Owens Corning attic air sealing jobs in Georgetown run $1,200-$2,800 for attics between 1,200 and 3,000 square feet. The low end covers single-story homes with straightforward access, 8-12 top plates to seal, and standard can-light covers. The high end includes multi-penetration chases, multiple HVAC platforms, and homes in neighborhoods like Sun City or along the San Gabriel River corridor where truss design complicates access.
Every job includes: removal of failed or inadequate existing sealant; Foamular NGX or specified equivalent cut and fitted to all top plates, penetrations, and the attic hatch; one-part foam seal at all joints; before-and-after blower-door test with documented CFM50 readings; thermal imaging before and after; and a written scope with flat price delivered before work starts. Under our 365-Day Done Right Promise, if any sealed joint fails within a year, we return and fix it. No renegotiation.
DIY or Call Us?
What you can safely check: verify your attic hatch has weatherstripping, look for daylight visible through top plates (kill the attic lights and check from below), and confirm bath fan housings are covered with rigid foam, not just loose-fill piled on top. These checks cost nothing and tell you plenty.
Where DIY goes wrong: working in a Georgetown attic in summer means heat stress above 140°F, and stepping through drywall is a real risk in homes with 24-inch truss spacing. More importantly, most homeowners miss the thermal bypass at the top of interior walls, where electrical wiring creates a chimney effect that only a blower-door test will reveal. Wes Okafor picked up his first blower-door numbers at Olive-Harvey College in Chicago, and we’ve learned that what looks sealed rarely is. Call (254) 970-2136 for a free estimate with written price before any work starts.
FAQs
Properly installed Foamular and one-part foam systems last 20-25 years in our climate, though the extreme attic heat of Central Texas summers can accelerate adhesive degradation at joints. We inspect sealed joints at the 5-year mark as part of our Done Right Promise follow-up. Call (254) 970-2136 to schedule a check.
Spot repair is possible if the failure is isolated to one or two penetrations, but partial fixes often miss the root cause, which is usually systemic pressure imbalance revealed by the blower-door test. We quote both options with written scope so you can compare. Most Georgetown homeowners choose full re-sealing once they see the CFM50 numbers.
A typical Georgetown attic air sealing job takes 4-6 hours for a crew of two, including the blower-door test and thermal imaging. We arrive with materials on the truck, and you’ll have your documented photo record and before-and-after numbers before we leave. Same-day scheduling is available when you call before noon.
Yes. We carry Foamular NGX in 3/4-inch and 1-inch thicknesses, AccuFit sealing accessories, one-part foam in high-temp formulation for Georgetown attics, and can-light covers rated for IC and non-IC housings. If your attic requires a specific Owens Corning accessory we don’t have loaded, we source it within 24 hours through Austin distribution.
Written by Wes Okafor, Owner, Topside Attic Insulation Georgetown at Topside Attic Insulation Georgetown, serving Georgetown and nearby areas.