Crawl Space Mold Removal in Nashville, TN

Why Middle Tennessee crawl spaces grow mold

Many Nashville homes sit on vented crawl spaces. Vents were meant to let moisture out, but in a humid summer the outside air is often wetter than the space under the house. When that air meets wood and metal cooled by the ground and by air conditioning ducts, it condenses. Add a torn plastic sheet, a gutter that dumps water against the foundation, or a slow plumbing drip, and joists and subfloor can stay damp for months. Hillside lots and homes near creeks tend to have it worse.

What the inspector should look at under the house

• Joists, beams and subfloor, with moisture readings on the wood.
• The vapor barrier: full coverage, taped seams, no tears.
• Standing water, wet soil or staining that points to drainage or a leaking supply or drain line.
• Sagging or wet fiberglass batts, which are usually removed, not dried.
• Ductwork, its insulation and the air handler if it sits in the crawl space.
• Foundation vents, the access door and any dryer vent ending under the house.

Ask for photos and a written scope that explains where the water comes from, not only where the mold is.

How the remediation usually goes

1. Fix the water source first. EPA is clear that mold returns if the moisture problem is not solved.
2. Remove and bag wet or moldy insulation and debris.
3. HEPA-vacuum and clean the framing and subfloor. Wood that is soft or badly damaged gets repaired, and structural repairs may need a Metro Codes permit.
4. Dry the space and confirm the wood has come down to a normal moisture level before anything is sealed in.
5. Install the moisture control the space needs, from a new vapor barrier to full encapsulation with a dehumidifier.

Vapor barrier, dehumidifier or full encapsulation

A new ground barrier and better drainage may be enough for a crawl space that only has a damp floor. Encapsulation goes further: the vents are sealed, heavy liner covers the floor and walls, and the space is dried with a dehumidifier or conditioned air. Angi reports national ranges of about $500 to $2,000 for crawl space mold remediation and $1,500 to $15,000 for encapsulation. Middle Tennessee prices vary with square footage, clearance height, how much insulation has to come out, drainage work and whether a dehumidifier is included. Ask for the mold work and encapsulation to be itemized separately.

Ductwork in the crawl space

Sweating or moldy ducts under the house can spread spores indoors. EPA advises not running an HVAC system you know or suspect is contaminated, so have the ducts and air handler checked on the same visit.

Who should do the work

For crawl space jobs of $3,000 or more in Davidson County, the company needs the state Home Improvement license, and jobs of $25,000 or more need a Tennessee contractor's license with the right classification; mold remediation is the S-F classification. Check the company on TDCI's Verify a License search.