Owens Corning Crawl Space Encapsulation: The Schertz Owner’s Guide
We stock and install Owens Corning-compatible crawl space encapsulation systems in Schertz, with most complete jobs running between $3,800 and $7,200 depending on crawl square footage and existing moisture damage. Same-day service is available when we have your liner specification on the truck, which we do for the 6-mil and 12-mil reinforced poly lines that Owens Corning has distributed through regional building-supply channels in the San Antonio metro since roughly 2019. Most Schertz homeowners discover their encapsulation has failed when they notice a musty smell returning after months of absence, or when they spot pooling water on the vapor barrier during our humid late-spring months - typically May through June when the Glen Rose limestone under much of Schertz wicks groundwater upward through foundation vents.
Which Owens Corning Models This Applies To
Owens Corning does not manufacture crawl space vapor barriers under its own brand label; instead, the company distributes reinforced polyethylene liners through select regional supply houses, often bundled with its Foamular rigid foam board or PinkWrap housewrap systems. If your crawl space was encapsulated by a builder or previous contractor between 2017 and 2023, you likely have either a 6-mil white reinforced poly with an Owens Corning lot tag, or the heavier 12-mil woven string-reinforced line that was more common in new construction around the Schertz and Cibolo corridor during that period.
To identify what you have, check the white adhesive label on the liner seam tape, or look for a stamped code on the poly itself near the crawl access. The 6-mil line measures roughly 0.006 inches nominal thickness and tears by hand once punctured; the 12-mil woven line has visible crosshatch fibers and requires a blade to cut. We stock both on our Schertz truck, plus the 20-mil upgrade that we recommend for homes near the Wetmore Road drainage basin where seasonal water tables run higher. We are an independent service provider, not affiliated with Owens Corning, so we will match your existing spec or upgrade it based on what your crawl is actually doing, not what a brand catalog suggests.
The OEM-versus-aftermarket question here is straightforward: Owens Corning distributed poly is virgin polyethylene with UV inhibitors, while the aftermarket equivalent we carry meets the same ASTM E1745 Class A standard for vapor retarders. The difference is warranty chain of custody. If your original installer was an Owens Corning-certified contractor, replacing with the same lot-coded poly preserves any remaining material warranty. If not, the ASTM-rated aftermarket line performs identically at a lower parts cost, and we document the spec sheet in your job folder either way.
Signs Your Owens Corning Crawl Space Encapsulation Is Failing
- Musty odor returning in humid months. The vapor barrier’s seam tape has delaminated, or the poly has torn at a pier block, letting soil moisture evaporate into the crawl air. In Schertz, we see this most often where the clay-heavy soils near FM 3009 shift seasonally and abrade the liner at foundation points.
- Pooling water on top of the barrier. This means groundwater is entering faster than your sump or drainage can remove it, and the poly is acting as a bathtub rather than a cap. The 6-mil line will float and wrinkle; the 12-mil woven line stays put but traps water underneath, which breeds mold on floor joists.
- Insulation falling from band joists or subfloor. When relative humidity in the crawl climbs above 70%, fiberglass batts absorb moisture and lose their adhesive bond. Owens Corning Pink insulation is particularly visible when it sags, and it’s a reliable indicator that your encapsulation seal has been compromised for weeks.
- Increased energy bills with no HVAC change. A failed vapor barrier lets humid crawl air infiltrate through floor penetrations. Your air conditioner works harder to dehumidify what the encapsulation was supposed to isolate. We verify this with a blower-door test - a pressurization reading that shows, in one number, how much air your building envelope is losing.
- Pest activity in the crawl. Termites and rodents follow moisture. A torn liner creates damp pockets that attract them, and the poly itself becomes a harborage once soil contact resumes. We document this with crawl photos during our inspection, included in every visit.
Replacement Cost & What’s Included
Complete encapsulation replacement in Schertz typically runs $3,800 to $5,400 for a 1,200-square-foot crawl using 12-mil reinforced poly, and $5,800 to $7,200 for the 20-mil upgrade with full seam sealing and a mechanical dehumidifier tie-in. The range depends on four factors: crawl clearance height (less than 18 inches requires different crew scheduling), existing mold or wood rot remediation needed, whether the original liner was glued to foundation walls or merely laid on the ground, and if your home needs a new sump pump or drainage mat installation.
Every replacement includes removal and disposal of the failed liner, surface prep of the crawl floor, new poly cut and sealed to wall height, pier block wrapping, and seam taping with pressure-rolled adhesive. We also air-seal the rim joist and sill plate with closed-cell spray foam before the new liner goes in, because - and this is the sequencing that matters - sealing the leaks first, then insulating, is the only way the encapsulation performs as designed. The attic doesn’t care how thick the insulation is if the air is still moving through it, and the crawl space operates on the same principle. Under Haven Standard Clause 1, you get a written price before any work starts, a written scope, and a written warranty. Our 365-Day Done Right Promise covers the installation. Before-and-after blower-door numbers are provided on applicable jobs so you can verify the air-sealing result.
DIY or Call Us?
There is nothing electrically dangerous about crawl space vapor barrier replacement, and a homeowner with a headlamp, knee pads, and a tolerance for tight spaces can inspect their own liner for tears or failed tape. What goes wrong in DIY is the sequencing: we regularly find Schertz homeowners who laid new poly over wet soil, or sealed the crawl without addressing the rim joist air leaks, or used hardware-store painter’s tape instead of vapor-barrier-rated seam tape that holds at 180-degree peel strength. The result is a re-do within two years, often with mold remediation added to the bill.
If your crawl is dry, your access is generous, and you are comfortable cutting and sealing poly to pier blocks, you can handle the liner swap yourself. If there is standing water, musty joists, or any suspicion of structural rot, call us. We carry moisture meters, respirators, and the closed-cell foam to seal the envelope properly. Reach us at (830) 402-5240 for a free estimate, or bring us a competing written quote for our Free Second Opinion.
FAQs
Properly installed 12-mil reinforced poly lasts 15 to 20 years in Schertz’s climate, though the 6-mil line often shows seam tape failure or abrasion tears at year 8 to 12, especially in crawls with active pest traffic or seasonal groundwater. The 20-mil upgrade we stock typically exceeds 20 years. Call (830) 402-5240 and we will inspect your current liner and give you a written remaining-life assessment.
Localized tears smaller than a dinner plate can be patched with vapor-barrier tape and a poly patch if the surrounding material is still supple and the seam edges are clean. If the liner is brittle, extensively taped already, or if moisture has pooled underneath, replacement is the only lasting fix. We do not charge for the honest call on this - our inspection includes a Documented Photo Record so you can see what we see.
Most Schertz crawls up to 1,500 square feet are completed in one long day or two standard days, depending on whether we are adding rim-joist foam or replacing drainage components. We arrive with a named technician, text when we are on the way, and leave you with a printed scope completion sheet and photo log. Under Haven Standard: Arrive on schedule, you get a named technician and a text when they are on the way.
Yes - we carry 6-mil, 12-mil, and 20-mil reinforced poly, vapor-barrier seam tape, closed-cell spray foam for rim-joist sealing, and drainage matting on every Schertz truck. We also stock Reflectix radiant barrier for crawl ceiling applications where the homeowner wants to reflect summer heat off the subfloor. If your spec is unusual, we will source it overnight rather than substitute without your written approval.
Written by Wes Okafor, Owner, Topside Attic Insulation Schertz at Topside Attic Insulation Schertz, serving Schertz and nearby areas.