Owens Corning Attic Air Sealing Nationwide

Owens Corning Attic Air Sealing: The Schertz Owner’s Guide

Most Owens Corning attic air sealing jobs in Schertz run between $1,400 and $2,800 installed, depending on attic square footage and how many top plates, can lights, and duct chases need sealing. We stock Owens Corning Foamular rigid foam board, ProPink sealants, and compatible one-part foam on every truck, and we can usually inspect and start the same day you call. Homeowners typically figure out something’s wrong when their upstairs bedrooms won’t cool below 78°F in July despite a new AC unit, or when they pull down the attic ladder and feel a sauna blast that shouldn’t be there.

Call (830) 402-5240

Which Owens Corning Models This Applies To

Owens Corning doesn’t sell attic air sealing as a single named “system” the way they sell insulation batts by R-value. What we’re talking about here is the Owens Corning building envelope approach: Foamular NGX rigid foam board cut to block open soffits and kneewalls, ProPink Gap Sealant for drywall-to-top-plate joints, and the one-part polyurethane foam (often the “ProPink” labeled cans) for penetrations. If your attic was insulated by an Owens Corning-certified contractor between 2015 and 2023, you likely have orange-labeled Foamular board blocking your soffits and pink-tinted sealant at your top plates.

Here’s how to tell what you’ve got. Check the attic hatch framing for a dated insulation certificate; Owens Corning-certified jobs usually include one. The Foamular board will have “NGX” or “XPS” stamped on the edge, typically 1-inch or 2-inch thickness. The sealant, if it’s theirs, cures to a slightly pink color and remains flexible. We don’t need you to identify every material before we arrive; that’s what the inspection is for. Topside Attic Insulation Schertz is an independent service provider, not affiliated with Owens Corning, but we’ve worked with their materials long enough to know the compatibility quirks: Foamular NGX (the current line) has a slightly different R-value per inch than the older Foamular 150, so patch repairs need to match or the thermal bridge shows up on our FLIR camera every time.

Signs Your Owens Corning Attic Air Sealing Is Failing

• Hot second floor despite good insulation depth. In Schertz, we see this most in homes built 2005 to 2015 where the original builder-grade sealant at the top plates has shrunk or detached. The R-38 blown-in fiberglass is doing its job, but conditioned air is still riding the wall cavities straight to the attic. Your insulation is fine; the air barrier isn’t.
• Dust streaks around ceiling can lights or bathroom fans. Those dark rings are filtration marks, conditioned air being pulled through the fixture housing because the foam gasket or sealant boot failed. Owens Corning-compatible ten-inch airtight covers solve this, but only if the original penetration was mapped correctly.
• Ice damming or heavy frost on nails in winter. Even Schertz gets a hard freeze every few years. Warm, moist air leaking through a failed top-plate seal condenses on cold nail shanks. The frost melts in February and you get a ceiling stain that looks like a roof leak but isn’t.
• Spikes in your CPS Energy bill that don’t track with temperature. A blower-door test will show this plainly: we regularly find Schertz homes at 3,500 CFM50 or higher that should be under 2,000 after proper sealing. The conditioned air you’re paying to cool is leaving faster than the duct system can replace it.
• New insulation settling unevenly near eaves or chases. Air movement through a failed soffit block or duct chase will vibrate and redistribute loose-fill fiberglass. You’ll see bare spots where the air is moving, not where mice have been at it.

Replacement Cost & What’s Included

What drives the range: attic square footage is only part of it. The real variable is how many penetrations, how accessible the top plates are (cathedral ceilings with limited headroom take longer), and whether we’re removing existing insulation to seal the deck properly before reinstalling. Our price includes all Owens Corning-compatible materials, labor, cleanup, and the post-job documentation. Every job gets a written price before any work starts, per Haven Standard Clause 1. No exceptions. The 365-Day Done Right Promise covers the workmanship; material defects fall to the manufacturer’s warranty, which we handle the paperwork for.

DIY or Call Us?

There’s a safe middle ground here, and then there’s the point where you need the truck.

What you can check yourself: pull your attic hatch and look for obvious gaps with a flashlight. Check if the Foamular soffit blocks are still in place or if they’ve been kicked aside by a cable installer. Look for gaps around chimney chases or plumbing vents where the original foam has crumbled. Take photos. That’s useful information, and it costs nothing.

Where DIY goes wrong: air sealing is sequencing work, not just caulk-gun work. You need a blower-door test to know which leaks matter most; without it, you’re sealing the easy-to-reach gaps and missing the ones that actually move air. The top plates in a typical Schertz home run at 140°F surface temperature in August; one-part foam cans left in a hot attic can overpressurize and rupture. And if you’re working around can lights, you need to know whether they’re IC-rated before you bury them in foam. Wes Okafor has seen more than one homeowner create a fire hazard by sealing the wrong fixture. We carry thermal barriers, fire-rated covers, and the knowledge of which Owens Corning assemblies require them. Call (830) 402-5240 when you’re ready for the inspection; the estimate is free, and the written price comes before any work starts.

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