Full Crawl Space Encapsulation System
A full system installs a 20-mil vapor barrier on floor and walls, seals foundation vents, adds a dehumidifier, and may include drainage.
NC R408 requires a mandatory 3-4 inch termite inspection gap on all closed crawl space conversions.
Cost: $5,000-$15,000.
Vapor Barrier Installation
20-mil reinforced polyethylene is the industry standard in NC.
Materials run $0.50-$0.70 per sq ft.
Must be combined with vent sealing and mechanical dehumidification for NC R408 compliance.
Crawl Space Dehumidifier Installation
Maintains humidity below 55% RH -- the threshold where mold and wood rot begin.
Cost: $780-$2,500 installed.
Required under NC R408 for closed crawl space compliance.
Vent Sealing
Foundation vents are sealed when converting to a closed crawl space.
A permit is required in Mecklenburg County and all NC counties.
Crawl Space Mold Remediation
Existing mold is addressed before encapsulation.
70-90% of older Southeast homes have moisture-damaged insulation or mold at first inspection.
Crawl Space Insulation
Insulation is installed on crawl space walls -- not subfloor joists -- in a closed system.
A 20-mil barrier plus closed-cell foam or rigid board on the walls is standard.
Sump Pump Installation
Required when standing water or groundwater intrusion is present.
Cost: approximately $1,100 installed.
Free Crawl Space Inspection
Inspections are free throughout Charlotte and Mecklenburg County.
A contractor assesses condition, identifies moisture sources, and provides a written estimate.
See our Charlotte crawl space encapsulation cost guide.