Owens Corning Attic Air Sealing: The Boerne Owner’s Guide
Most Owens Corning attic air sealing jobs we handle in Boerne run between $1,800 and $3,400 installed, depending on attic square footage and how many top plates, can lights, and penetrations need sealing. We stock Owens Corning-compatible acrylic-latex sealants, rigid foam board, and weatherstripping on every truck, and we can usually inspect and start work same day if you call before noon. Homeowners typically figure out something’s wrong when rooms stay hot despite new insulation, or when their HVAC runs nonstop through a Boerne August afternoon.
Which Owens Corning Models This Applies To
Owens Corning doesn’t sell attic air sealing as a single branded system the way they sell ProPink or AttiCat blown-in insulation. Instead, the compatibility question is about which Owens Corning insulation products you’re pairing the seal with. If you’ve got ProPink L77 loose-fill or PINK Next Gen Fiberglas batts in your attic, we match the air sealing approach to that specific product line and the attic floor construction.
Here’s how to identify what you’ve got. Look for a paper label stapled to a rafter or a printed lot number on the insulation bag if any remain. ProPink L77 is a loose-fill product blown to R-38 or R-49; Next Gen batts are the denser, paper-faced rolls. The air sealing spec differs because loose-fill settles around irregular framing, while batts need a continuous air barrier beneath them. We use Owens Corning Foamular NGX rigid foam for thermal bridging blocks at the eaves, paired with their specified acrylic-latex sealant for top plate gaps. For homes with older Owens Corning FG-25 batts from the early 2000s, we check for degraded kraft facing before sealing over it.
Aftermarket equivalents exist, and we carry them. Johns Manville AP Foil-Faced foam board performs the same thermal-blocking function at the eaves, and we stock it as an alternative when Owens Corning supply runs thin. We don’t use generic caulk in place of the specified acrylic-latex; it cures too stiff for the expansion and contraction a Boerne attic sees between 40°F January nights and 140°F August roof deck temperatures.
Signs Your Owens Corning Attic Air Sealing Is Failing
- Hot second-floor rooms in summer despite running the AC constantly. Conditioned air is leaking into the attic through unsealed top plates and recessed can light housings. The insulation above doesn’t stop air movement; it only slows conductive heat gain. We see this most in Boerne’s 1990s and 2000s subdivisions near River Road, where builders blew insulation without sealing first.
- Dust streaks around ceiling registers or light fixtures. These dark lines are filtration soiling, airborne attic dust being pulled through gaps by the pressure differential between your conditioned space and the attic. It’s a reliable visual indicator that the attic floor isn’t airtight.
- Ice damming or heavy frost on roof sheathing in winter. Warm, moist interior air leaks upward, hits cold roof decking, and condenses. In Boerne’s occasional hard freezes, this shows up as frost that melts and stains ceiling drywall. The air sealing failed, not the insulation R-value.
- Spikes in summer electric bills with no rate change. A blower-door test we ran last year on a home near the Cibolo Nature Center read 3,800 CFM50 before sealing and 2,100 after. That homeowner’s August bill dropped 23 percent. The leakage was through plumbing and electrical penetrations the original builder had missed.
- Insulation that looks disturbed or settled unevenly. Air moving through the attic floor disturbs loose-fill over time, creating thin spots. If your ProPink looks like it has footprints or washboard patterns, air is moving through it. The seal is compromised somewhere below.
Replacement Cost & What’s Included
| Scope | Typical Range in Boerne |
|---|---|
| Small attic (under 1,200 sq ft), standard penetrations | $1,800 - $2,400 |
| Mid-size attic (1,200-2,200 sq ft), can lights, multiple top plates | $2,400 - $3,000 |
| Large or complex attic (2,200+ sq ft), vaulted sections, extensive wiring penetrations | $3,000 - $3,400+ |
What drives the range: attic square footage, accessibility, number of recessed light fixtures that need fire-rated covers, and whether we need to remove existing insulation to access the floor deck. Every quote is a flat price, written scope, written warranty before anyone lifts a tool. Haven Standard Clause 1. The price includes all sealant, rigid foam, weatherstripping, fire-rated covers for can lights, and the blower-door test to verify the result. We publish before-and-after numbers on every job. The 365-Day Done Right Promise covers all completed work.
DIY or Call Us?
There’s a short list of things a homeowner can safely check. Look for visible gaps around the attic hatch, light streaks coming through the floor from below, or disturbed insulation patterns. Take photos. That documentation helps us quote accurately without a preliminary visit.
What goes wrong with DIY: attic air sealing requires working around energized electrical boxes, identifying which can lights are IC-rated versus non-IC, and knowing where to stop sealing so you don’t trap moisture. The acrylic-latex sealant needs to be applied to a clean, dry surface at temperatures above 50°F, which means a Boerne attic in January isn’t the right conditions. And without a blower-door test, you’re guessing at whether you found the leaks that matter. We’ve been called in after DIY jobs where the homeowner sealed the wrong penetrations and missed the actual top plate gaps. Call (830) 529-7780. We’ll give you a written price and a documented photo record.
FAQs
Properly installed acrylic-latex sealant and rigid foam should last 20 to 30 years in a vented Boerne attic. The bigger variable is whether future electricians or HVAC techs disturb the seal when they run new wiring or ductwork. We document the sealed locations with photos so anyone working up there later knows where not to cut.
Partial repairs work if the original seal was done well and only specific areas failed, like around a new ceiling fan or bathroom vent. If the original job was skipped entirely or done with the wrong materials, spot repairs usually cost more in labor than doing it right once. Bring us any written estimate for a free second opinion.
Most Boerne homes are a single day, start to finish. A small attic with standard access might take four hours; a large home with extensive can lights and multiple HVAC zones could stretch to two days. We run the blower-door test, seal, then test again. You get the printed pressure-differential report before we leave.
We carry Owens Corning-compatible acrylic-latex sealant, Foamular NGX rigid foam, fire-rated can light covers, and weatherstripping on every truck. We also stock Johns Manville and Knauf equivalents. We’re an independent service provider, not affiliated with Owens Corning. If your job calls for a specific Owens Corning spec, we source it. Call (830) 529-7780 for an exact quote - estimates are free.
Written by Wes Okafor, Owner, Topside Attic Insulation Boerne at Topside Attic Insulation Boerne, serving Boerne and nearby areas.