Vapor barrier installation in Charleston, SC
A vapor barrier is a plastic liner over the crawl space floor that slows ground moisture from rising into the space. It costs much less than a full encapsulation and is often the first upgrade for homes with torn, thin or missing plastic.
Barrier only vs. full encapsulation
A ground barrier covers the floor. Encapsulation adds wall liner, pier wraps, sealed vents and humidity control. Ask which one your quote is for.
Published Charleston prices
| Item | Published range | Source |
|---|---|---|
| 10 mil barrier, installed, seams taped | $0.70 per sq ft | Coastal Crawlspaces (Charleston installer), published price list |
| 14 mil reinforced barrier | $1.00 per sq ft | Coastal Crawlspaces (Charleston installer), published price list |
| 20 mil barrier | $1.40 per sq ft | Coastal Crawlspaces (Charleston installer), published price list |
| Example: 1,500 sq ft, ground barrier only | about $1,050 (10 mil) to $2,100 (20 mil) | Coastal Crawlspaces (Charleston installer), published price list |
| Vapor barrier installation, national | $1,200–$4,000 | HomeGuide, How Much Does Crawl Space Encapsulation Cost? (Jan 14, 2026) |
Coastal Crawlspaces' posted prices cover the ground barrier only; cleanout, wall liner, pier wraps, drainage and dehumidifiers are extra (Coastal Crawlspaces (Charleston installer), published price list).
Vapor barrier installation FAQ
What thickness of vapor barrier should I get?
Is a vapor barrier enough?
Where we can match you
Vapor barrier installation requests are accepted across the Charleston area:
Related services
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