CertainTeed Crawl Space Encapsulation Nationwide

CertainTeed Crawl Space Encapsulation: The San Antonio Owner’s Guide

We stock and install CertainTeed-compatible crawl space encapsulation materials in San Antonio, with most full encapsulations running $3,200 to $6,800 depending on square footage, access, and the condition of your existing vapor barrier. Most jobs are completed in one to two days, and we carry liner, seam tape, and fastening materials on the truck so we’re not making supply runs mid-job. The way most San Antonio homeowners discover a failed encapsulation is specific: they open the crawl space hatch in July and catch that musty, mushroomy smell, or they notice a floor that feels damp through the carpet in the hallway. That’s the liner telling you it’s torn, pulled loose, or was never properly sealed along the foundation walls in the first place.

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Key Takeaways

• We install CertainTeed and CertainTeed-compatible crawl space encapsulation systems, not just the liner but the full system: liner, seam tape, wall fastening, and pier wrapping.
• Typical installed cost in San Antonio runs $3,200 to $6,800, with your written price locked before we open the hatch.
• Most failures we see are liner tears from foot traffic during HVAC or plumbing work, not product defects.
• We’re an independent installer, not affiliated with CertainTeed, and we stock liner repair material on every truck.

Which CertainTeed Models This Applies To

CertainTeed doesn’t sell a single “crawl space encapsulation kit” under one model number. What they manufacture is the MemBrain vapor barrier line, the DryRight fiberglass insulation, and the Form-A-Drain foundation drainage products that often get used together in a crawl space build. We work with the MemBrain liner in 10-mil and 12-mil thicknesses, in rolls from 8 to 12 feet wide. The compatibility gotcha is the thickness: a 6-mil generic liner from a big-box store won’t hold up to the humidity swings in San Antonio, where crawl spaces in Alamo Heights or Terrell Hills can go from 45% relative humidity in January to 85% in August. When we quote a repair, we check the existing liner’s thickness with a micrometer before we recommend a patch versus a full re-line. If the liner is polyethylene-based and at least 10-mil, we can seam in CertainTeed-compatible material cleanly. If it’s a thin 6-mil that’s gone brittle, a patch is money you’ll spend twice.

We also stock Reflectix radiant barrier material for crawl space rim joist applications. Different job, but mentioned here because homeowners sometimes confuse the two.

Signs Your CertainTeed Crawl Space Encapsulation Is Failing

• Musty odor coming through floor registers or gaps around plumbing. This is the most common first sign in San Antonio. A torn liner lets soil moisture wick up, and what you smell is microbial growth feeding on humid air in the joist bays. The liner’s job is to block that moisture path, and once it’s breached, the crawl space starts behaving like a damp basement in July.
• Floor feels cool or damp through carpet in specific rooms. When the liner pulls away from a foundation wall, unconditioned air moves freely under the subfloor. In San Antonio’s shoulder seasons, that means a floor in the living room that feels 10 degrees cooler than the air in the room. It’s not a ghost. It’s a liner that’s pulled loose.
• Visible standing water or saturated soil under the house after rain. A functioning encapsulation system channels bulk water to a sump or perimeter drain. If you shine a flashlight under the house after a heavy June storm and see pools, the liner has either torn along the seams or the drainage path underneath has clogged. We see this constantly in older San Antonio neighborhoods like Jefferson and Monticello Park, where foundation drainage was an afterthought in the original build.
• Pier wraps hanging loose or missing. Crawl space piers get wrapped with the same liner material, and when those wraps sag or split, the piers wick moisture up from the soil and release it into the joist system. Look for liner that’s come off the top of the pier or is crumpled at the base.
• Insulation in the rim joist cavity is damp or falling down. If CertainTeed DryRight or any fiberglass is touching a wet liner or exposed soil, it’s pulling water. We pull the wet insulation, fix the liner, and re-install. The insulation itself is usually salvageable if we catch it within a season.

Replacement Cost & What’s Included

For a typical 1,200 to 1,800 square foot San Antonio crawl space, a full CertainTeed-compatible encapsulation runs $3,200 to $6,800 installed. That includes removing and disposing of the old liner, installing 10-mil or 12-mil reinforced polyethylene liner across the floor and up the foundation walls, sealing all seams with manufacturer-specified tape, wrapping any piers, and securing everything with mechanical fasteners, not adhesive alone. Smaller repair jobs, like patching a 6-foot tear or re-securing a pulled-away wall section, run $300 to $800. The two biggest price drivers are access and condition: a crawl space with 18 inches of clearance in an older bungalow off McCullough Avenue takes us twice as long as a 36-inch clearance in a newer build in Stone Oak, and a liner that’s been torn for years may have already let joist mold set in, which adds remediation time. Every quote we write is a line-item written price before we open the hatch. No ranges on the invoice, no “we’ll see what we find.” Neil Barron walks the property first and gives you the number in writing.

DIY or Call Us?

You can safely check the thickness of your existing liner, look for visible tears, and document where the liner has pulled away from foundation walls. What you should not do is attempt a DIY patch on a crawl space liner that’s been breached for more than a month. By the time the smell is in the house, there’s often enough moisture and microbial activity in the joist bays that you want a professional looking at the full picture, not just the hole. Crawl space work also means working at low height around plumbing, electrical runs, and sometimes sharp foundation edges, and that’s a job for someone with knee pads, a headlamp, and the right seam tape. If you’ve got a tear you can see from the access door and you want to know if it’s a $400 patch or a $5,000 re-line, call us at (903) 437-9164 and we’ll tell you honestly. Neil would rather talk you out of a bad patch than into a full job.

How Much Does CertainTeed Crawl Space Encapsulation Cost in San Antonio?

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