Owens Corning Crawl Space Encapsulation & Vapor Barrier in Converse: What to Know First
We provide independent Owens Corning crawl space encapsulation and vapor barrier service in Converse, with most jobs completed in one to two days and pricing written before any work starts. As an independent Owens Corning service provider, we carry no manufacturer affiliation, which means we source parts based on what fixes your specific failure, not what moves a dealer’s inventory. Most Converse crawl space encapsulation jobs run between $2,800 and $6,500 depending on liner grade, square footage, and whether the foundation needs sealing before the barrier goes down. Call (830) 420-0953 for a written estimate, or bring us a competing quote for a free second opinion.
This page is for homeowners in Converse and nearby Bexar County communities who have an Owens Corning product in their crawl space, or who are considering one, and need honest information about how it performs in our local climate, what fails, and what it costs to fix or install right.
How Owens Corning Products Fail - and How We Fix Them
- Owens Corning Foamular NGX 250 below-grade board - In Converse’s clay-heavy soils, this XPS insulation absorbs ground moisture through cut edges when the vapor barrier laps aren’t heat-sealed at seams. We’ve pulled saturated NGX 250 boards in Live Oak and Converse homes where the original installer taped seams with foil tape that failed in year three. We remove the wet board, dry the space with commercial dehumidification, and reinstall with 6-mil minimum overlap seams welded with a heat gun, not tape.
- Owens Corning ProPink loose-fill blown over damp crawl space floors - ProPink is an attic product, but we regularly find it misapplied in Converse crawl spaces by crews who treated the job as “insulate the floor” without addressing the moisture source first. The fiberglass mats, compresses, and grows mold on the paper facing. We remove the contaminated material, install a ground vapor barrier, then use only moisture-resistant products like closed-cell spray foam or rigid board rated for below-grade use.
- Owens Corning Duration shingles overhead (indirect crawl damage) - When Duration shingles fail at the eaves due to improper drip edge flashing, water runs down the fascia and into the crawl space through the band joist. In Converse’s sudden summer downpours, this can saturate a crawl space before the homeowner notices. We fix the water intrusion path first, then address the crawl space encapsulation. Seal the leaks first. Then insulate. The numbers will tell you if it worked.
- Owens Corning EcoTouch batts on crawl space walls - The kraft facing on EcoTouch batts is not a vapor barrier; it’s a vapor retarder. In Converse’s humid shoulder seasons, when outdoor dew points stay above indoor crawl space temperatures for weeks, condensation forms behind the facing and rots the sill plate. We remove the batts, inspect the sill for decay, and replace with a true encapsulation system: rigid foam board with taped seams, or closed-cell spray foam that acts as both insulation and air barrier.
- Owens Corning Basement Wall System misapplied to crawl spaces - This semi-rigid fiberglass panel system is designed for full basements with controlled humidity. In Converse’s vented crawl spaces, the fabric surface traps airborne moisture and becomes a mold substrate. We’ve removed these systems from several homes near Randolph Air Force Base where the installation was sold as “encapsulation” without humidity control. We replace with a full ground-to-sill polyethylene encapsulation, sealed at all penetrations, with a dedicated dehumidification strategy.
Our Owens Corning Crawl Space Encapsulation & Vapor Barrier Process
- 1
Site assessment and moisture mapping. We inspect the crawl space with a moisture meter and infrared camera to find active leaks, capillary rise, and thermal bridges. You get photos of every finding.
- 2
Blower-door test if the home hasn’t been tested. We pressurize the house to measure air leakage in CFM50 (cubic feet per minute at 50 pascals) so we know how much conditioned air is being pulled through the crawl space. This establishes the baseline.
- 3
Written scope and price. Under Haven Standard Clause 1, you receive a flat price, written scope, and written warranty before anyone lifts a tool. No work starts without it.
- 4
Water management first. We address drainage, grade, and any plumbing leaks before encapsulation. Installing a vapor barrier over wet ground is optimism, not encapsulation.
- 5
Encapsulation installation. We install a 12-mil or 20-mil reinforced polyethylene ground liner, sealed at seams with heat welding, extended up foundation walls to the sill plate, and sealed at penetrations. Rigid foam or closed-cell spray foam is applied to walls if specified in the scope.
- 6
Dehumidification and final documentation. We size and install a dedicated crawl space dehumidifier, run a post-encapsulation blower-door test, and deliver your Documented Photo Record and performance report.
Before
AfterWhat Owens Corning Crawl Space Encapsulation & Vapor Barrier Costs in Converse
| Scenario | Typical Range |
|---|---|
| Basic ground vapor barrier only (12-mil, no wall insulation) | $2,800 - $4,200 |
| Full encapsulation with 20-mil liner, wall foam, sealed sill | $4,500 - $6,500 |
| Removal of failed Owens Corning product + re-encapsulation | Add $800 - $1,800 |
| Dedicated dehumidifier installation | $1,200 - $2,400 |
| Sill plate repair or sistering (if rot found) | $400 - $1,200 per section |
What moves the price: crawl space height (less than 18 inches adds labor), existing debris or rodent damage, accessibility from the exterior, and whether the home has active water intrusion that needs management before encapsulation. Every job gets a written price before work starts. Call (830) 420-0953 for an exact quote, estimates are free, and we provide free second opinions on any written estimate you bring us.
Why Converse Homeowners Call Topside Attic Insulation Converse for Owens Corning Work
We’ve sealed and insulated over 9,000 homes since 2016, every one with a written price before work started and a documented record when the crew left. Our technicians are background-checked and uniformed; calls are answered by a live person 24/7. We don’t carry proprietary product lock-in, we source from Owens Corning, Johns Manville, Knauf, Rockwool, CertainTeed, Icynene, Demilec, and GreenFiber, plus Reflectix when radiant barriers make sense. The 365-Day Done Right Promise applies to all completed work. If it’s not done right, we make it right.
Wes Okafor runs a blower-door test before and after every applicable job so customers leave with a printed report showing exactly how much the envelope tightened. He keeps a dog-eared notebook of job photos on his phone, not for marketing, just because a picture of a thermal bridge caught on infrared is easier to explain than a paragraph.
FAQs
No, proper crawl space encapsulation does not void Owens Corning product warranties, though modifying or removing Owens Corning materials to install encapsulation may affect coverage on those specific products. We document the condition of any existing Owens Corning materials before we start, and we can install encapsulation around rather than through intact products when appropriate. Call (830) 420-0953 if you have warranty paperwork you’d like us to review with you.
We source Owens Corning materials through standard distribution channels, but for crawl space encapsulation, we typically use cross-compatible vapor barrier and rigid foam products that meet or exceed Owens Corning specifications. We don’t claim exclusive or preferred status with any brand. If your job specifically requires an Owens Corning SKU, we’ll note it in the written scope and source it.
Repair is cheaper in the short term, but rarely in the long term. Patching a failed vapor barrier or replacing wet fiberglass batts without addressing the moisture source means you’ll pay again. In Converse’s climate, where summer ground temperatures stay warm and humidity stays high, partial repairs typically fail within two to four years. Full encapsulation with humidity control costs more upfront but eliminates the cycle. We price both approaches in our written estimate so you can compare.
We schedule inspections within one to three business days for non-emergency calls, and same-day for active water intrusion or structural concerns. A live person answers calls 24/7, so you’ll know the timeline when you call, not after a callback. The inspection itself takes 45 minutes to an hour for a typical Converse crawl space, and you receive the written price before we leave.
In Converse, yes. A vapor barrier alone slows ground moisture evaporation but doesn’t control airborne humidity, and our outdoor dew points exceed 70°F for months each year. Without mechanical dehumidification, relative humidity in a sealed crawl space still climbs above 60 percent, the threshold for mold growth. We size dehumidifiers to the crawl space volume and include them in most full encapsulation scopes. Call (830) 420-0953 and we’ll run the load calculation with your estimate.
Written by Wes Okafor, Owner & Lead Insulation Technician, Topside Attic Insulation Converse at Topside Attic Insulation Converse, serving Converse and nearby areas.