CertainTeed Crawl Space Encapsulation Nationwide

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

CertainTeed crawl space encapsulation in San Francisco typically runs $4.50 to $9.00 per square foot installed, depending on whether you’re lining a 400-square-foot Sunset District crawl or a full Victorian basement in Noe Valley. We stock CertainTeed’s MemBrain and 10-mil reinforced liner options and can usually be on site within 24 to 48 hours. Most San Francisco homeowners discover the problem the hard way: a musty smell drifting up through the floorboards in March, or a puddle that never quite dries under the house after a week of North Bay fog.

Call (341) 247-0222

We’re an independent installer, not a CertainTeed subsidiary. That matters because we can match the right CertainTeed product to your specific crawl space without pushing you toward one brand’s catalog. If a CertainTeed liner has failed, we replace it properly. If the issue is actually a missing vapor barrier or a sump pump that gave up, we’ll tell you that instead of selling you an encapsulation you don’t need.

Which CertainTeed Models This Applies To

CertainTeed makes three main crawl space encapsulation product lines that show up in San Francisco homes: MemBrain (a smart vapor retarder that changes permeability with humidity, which matters in our fog belt), their 10-mil and 12-mil reinforced polyethylene liners, and Drainage Mat for below-grade wall applications. The compatibility gotcha we see constantly: MemBrain is not a liner replacement. It’s a vapor retarder meant to sit against foundation walls or over dirt floors, and it’s rated for specific humidity ranges that behave differently in a Pacific Heights 1906 basement than in a Daly City hillside crawl.

To identify what you have: look for the CertainTeed branding printed on the liner edge, usually in green or black ink with the product name and mil thickness. If the print has worn off, measure the thickness with a micrometer or a $5 mil gauge from any hardware store. A 10-mil liner in a wet crawl fails in ways a 12-mil won’t, and the difference shows up as pinhole tears along the seams first. For the OEM versus aftermarket decision: CertainTeed’s reinforced liners carry a 20-year material warranty, and most off-brand liners sold at big-box stores in San Francisco are 6-mil contractor grade that degrades within five years in our moisture cycle. We stock both OEM CertainTeed rolls and quality aftermarket equivalents, and we’ll show you the mil measurement before cutting a single square foot.

Signs Your CertainTeed Crawl Space Encapsulation Is Failing

• Musty or earthy smell in the living space above the crawl. This is the first symptom most families notice. The smell means moisture is bypassing the liner somewhere, usually at a seam or where the liner was cut around a pier. Once vapor gets past the barrier, it condenses on joists and feeds mold.
• Visible standing water or damp patches on the liner surface. A properly sealed CertainTeed liner should have water on top of it during wet months, especially in low-lying areas like the Marina or the Mission where the water table is shallow. If you see water under the liner or pooling at the edges, the seal has failed.
• Ripped, sagging, or pulled-away liner along the foundation walls. San Francisco’s expansion and contraction cycle works liner staples loose over time. In older homes with fieldstone foundations, the liner often detaches entirely at the top edge, letting soil gas and moisture rise straight into the floor assembly.
• Insulation hanging down or falling from the crawl space ceiling. When moisture gets past the encapsulation, fiberglass batts between floor joists absorb it like a sponge, get heavy, and fall. If you see pink or yellow insulation sagging under the house, you have a moisture problem, not an insulation problem.
• Higher than normal relative humidity in the home, condensing windows, or a cough that won’t clear up. This is the late-stage sign. By the time the humidity migrates into the living space, the crawl space has been unsealed for months. In San Francisco’s fog-driven climate, a failed encapsulation can push indoor relative humidity above 70% even in summer.

Replacement Cost & What’s Included

Here’s the honest San Francisco pricing picture, based on jobs we’ve done from the Richmond to Bernal Heights:

• Full encapsulation of a 300 – 500 sq ft crawl space: $1,350 – $4,500 installed. The range covers sealing the floor and foundation walls, taping all seams, and securing the liner to piers and supports.
• Partial liner replacement or seam repair: $400 – $1,200. If the CertainTeed liner is mostly sound and the failure is isolated to one wall or a run of pulled staples, this is the fix.
• Added vapor barrier over existing failed liner: $1.50 – $3.00 per sq ft. Sometimes the right call is a new 10-mil CertainTeed barrier laid over the old liner rather than a tear-out, especially in crawl spaces with low clearance where removal is slow work.
• Mold remediation before re-encapsulation: $800 – $2,500, depending on square footage and whether joists need treatment. We do this before any new liner goes down. Encapsulating over active mold traps the problem inside your house.

Every job includes the written price before we start, which is a Cedarwell Care Promise standard and not an optional add-on. You’ll know the exact number, the exact product, and the exact scope before our crew puts on shoe covers. The liner itself carries CertainTeed’s manufacturer warranty. Our installation work is backed by the 365-Day Done Right Promise: if something isn’t right within a year, we fix it without a debate.

DIY or Call Us?

You can safely inspect your own crawl space for the symptoms above. You can measure liner thickness, check for standing water, and look for gaps along the foundation wall. What you shouldn’t do is attempt a full re-encapsulation in a San Francisco crawl space with low clearance and questionable air. Crawl spaces in this city are often tight enough that working down there means hours on your stomach in damp, enclosed conditions, and if the space has mold, you’re breathing spores without proper respiration gear. Signs include electrical wiring run through the joists you’d be working around. We’ve seen more than one homeowner start a DIY liner job in the Richmond District and call us halfway through because the space was too wet, too tight, or the liner they bought at a hardware store was 6-mil and already tearing.

If you want to check your crawl space and report back what you find, call us. We’ll walk you through what to look for, what the measurements mean, and whether you actually need a full replacement or a targeted repair. The number is (341) 247-0222.

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