CertainTeed Crawl Space Encapsulation Nationwide

CertainTeed Crawl Space Encapsulation: The West Hollywood Owner’s Guide

We stock and install CertainTeed-compatible crawl space encapsulation systems in West Hollywood, with most complete jobs running $3,800-$6,200 depending on square footage and whether the foundation needs active dehumidification. Same-day assessment is available when you call (213) 306-2607, and we carry CertainTeed vapor barrier rolls and seam tape on every truck. Most West Hollywood homeowners discover their encapsulation has failed when they notice a sharp musty smell returning after months of absence, or when their dehumidifier runs continuously without dropping the relative humidity below 65%.

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Which CertainTeed Models This Applies To

CertainTeed’s crawl space line centers on the CertaSeal vapor barrier system, available in 6-mil, 10-mil, and 16-mil reinforced polyethylene, plus the CertaWrap foundation wall insulation used in conditioned crawl applications. The model identifier is printed on the white tape strip running every 24 inches along the barrier edge, formatted as CT-6MIL-R, CT-10MIL-R, or CT-16MIL-R, with the “R” denoting reinforced scrim. If your existing barrier has gone cloudy, brittle, or the printed strip has worn off, measure the thickness with a micrometer at an unstressed corner, 10-mil reads 0.254 mm and is the most common spec we see in 1920s West Hollywood bungalows with partial dirt floors.

OEM CertainTeed barrier matches the original scrim pattern exactly, but we also stock StegoCrawl 10-mil and Crawlspace Depot 12-mil reinforced as quality aftermarket equivalents, both compatible with CertainTeed seam tape and mastic. The gotcha: CertainTeed’s 2017-2019 production run used a narrower 3-inch seam allowance, so 2020+ barrier with standard 6-inch overlap will bunch at the foundation wall if you’re patching rather than replacing full sections. We check this on every West Hollywood job because mixing seam widths creates channels where soil gas and moisture migrate upward.

Topside Attic Insulation West Hollywood is an independent service provider, not affiliated with CertainTeed Corporation.

Signs Your CertainTeed Crawl Space Encapsulation Is Failing

• Condensation beads on the barrier underside. This means the seal at the perimeter piers or wall footings has separated, letting warm exterior air meet the cooler conditioned crawl space. In West Hollywood’s marine-influenced climate, this happens faster on north-facing foundations where the ground stays damp longer into June.
• White mineral deposits (efflorescence) on the foundation walls above the barrier line. The vapor barrier is no longer blocking soil moisture migration; those salts are calcium and magnesium carried through the porous concrete by water vapor that should have been stopped at the dirt.
• Soft or bouncy floor joists when walked overhead. Moisture content in wood above 20% causes fungal decay, and a failed barrier is the most common culprit in encapsulated crawls. We bring a pinless moisture meter on every assessment and flag readings above 18%.
• Increased pest activity, particularly silverfish and springtails. These insects require relative humidity above 70% to reproduce. If they’re appearing in the living space above, the crawl space humidity has climbed past the encapsulation’s design threshold of 55%.
• Your dehumidifier’s condensate pump runs hourly instead of cycling. The equipment is compensating for a barrier breach it was never sized to handle. In West Hollywood’s smaller 800-1,200 square foot foundation footprints, we see this when the original 6-mil barrier has abraded at the access door threshold from repeated entry.

Before

After

Replacement Cost & What’s Included

Complete CertainTeed-compatible encapsulation in West Hollywood runs $3,800-$4,800 for partial replacement (barrier only, under 800 square feet) and $5,200-$6,200 for full encapsulation including foundation wall insulation, dehumidifier sizing, and new access door seal. The spread depends on three factors: crawl space height (less than 18 inches requires specialized equipment), whether we need to remove and dispose of failed fiberglass batt insulation from the joist bays, and if the existing piers need rewrapping with closed-cell spray foam at the base.

Every job includes our Documented Photo Record, before-and-after humidity readings with calibrated sensors, and the 365-Day Done Right Promise. We also publish blower-door numbers when the encapsulation ties into whole-house air sealing, which we recommend for any West Hollywood home built before 1980 with original top plate construction.

DIY or Call Us?

An owner can safely check three things: the dehumidifier’s filter and drain line, the access door’s weatherstrip condition, and whether the barrier has pulled free at obvious points like the sump pit or pier bases. What you cannot safely assess is the seam integrity across the full footprint, the vapor drive rate through the foundation walls, or whether your dehumidifier is properly sized for the latent load. Crawl spaces with active mold, deteriorated structural members, or gas appliance venting require professional evaluation, and California Energy Code Section 150.0(c) mandates specific clearances for combustion air that DIY barrier installation can inadvertently block.

We carry CertainTeed-compatible barrier, seam tape, and closed-cell foam on every truck, and we stock Reflectix radiant barrier for hybrid applications where the crawl has both conditioned and unconditioned zones. Call (213) 306-2607 for a written price before any work starts. Estimates are free, and we offer a Free Second Opinion on any written estimate you’ve already received.

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