Description
20-Mil Liner: The Heart of a Sealed Crawl Space
Crawl space encapsulation means sealing the crawl space off from outside air and ground moisture: vents closed, floor and walls lined, seams taped, and humidity controlled by a dehumidifier. The liner takes the most abuse, and at 20 mil this polyethylene is more than three times as thick as basic ground cover. It stands up to crawling, stored items and years of service visits.
Specifications
| Material | Polyethylene |
|---|---|
| Thickness | 20 mil |
| Roll size | 20 ft x 100 ft |
| Coverage | 2,000 sq ft per roll |
A Complete Encapsulation System
- 20-mil liner on the floor and up the walls, seams taped.
- Foundation vents sealed.
- A crawl space dehumidifier to hold humidity around 50 to 60%.
- Drainage fixed first if water pools after rain.
Why Encapsulate?
Encapsulation stops musty odors, mold on joists, and damp air rising into the house. It’s the long-term fix for crawl spaces with recurring moisture problems.
Buy It or Have It Installed
Order rolls here, or let our licensed crew (CSLB #1139733) do the full job. See crawl space encapsulation in Los Angeles and our encapsulation cost guide.
CrawlGuard 20-Mil Polyethylene Vapor Barrier FAQ
- What thickness vapor barrier is best for encapsulation?
- Heavy liners such as 20-mil are preferred for encapsulation because they resist punctures from foot traffic and storage.
- Do I need a dehumidifier after encapsulation?
- In most sealed crawl spaces, yes. A dehumidifier keeps humidity in a safe range year-round.
