Crawl Space Vapor Barrier Installation in Cary, NC
20-mil reinforced liner over bare Piedmont clay floors. Priced for Wake County homes on Cecil-Appling Sandy Clay Loam hardpan.
How much does crawl space vapor barrier installation cost in Cary, NC?
Crawl Space Vapor Barrier Installation in Cary, NC costs $5,500 to $11,500 for a typical home. A crawl space vapor barrier in the Triangle costs $1,800 to $4,200 and covers the dirt floor with a 20-mil reinforced polyethylene liner, seam-taped and mechanically fastened to foundation walls to block ground moisture from evaporating into floor joists.
Cary soil and why crawl spaces fail here
Cary's Cecil-Appling complex carries a sandy surface horizon over a stiff clay hardpan. Rain infiltrates the first several inches quickly, then stalls on the hardpan and spreads out under the home as a shallow perched table that never fully drains between storms.
Executive-scale footprints in Preston, Lochmere, and Amberly enclose enormous volumes of ground vapor. That vapor condenses on cool ductwork and drives moisture content in the subfloor above 18%, which shows up as cupped and crowned hardwood in formal living areas.
Cary homeowners typically hold their homes long term and expect documented humidity readings before and after work, not just a plastic liner.
Scope included in Cary
- 20-mil reinforced woven liner rated far above the builder-grade 6-mil poly used across Wake County subdivisions
- Seams double-taped and overlapped 12 inches, piers wrapped and sealed individually
- Termite inspection gap maintained per North Carolina building code
- Drainage matting added where Cecil clay perches water beneath the liner
Signs you need this
- Bare dirt or torn plastic under the house
- Musty odor rising into hallways and closets
- Condensation on ductwork in summer
Neighborhoods we cover in Cary
Other services in Cary
Vapor Barrier in nearby Triangle towns
See the full Cary crawl space guide or the Triangle-wide vapor barrier overview.
Vapor Barrier in Cary: common questions
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