Crawl space encapsulation in Lexington, KY
A crawl space that smells, sweats or grows mold affects the whole house above it. Encapsulation is the most common fix.
Crawl space encapsulation means covering the soil floor and usually the walls of a crawl space with a heavy plastic liner, sealing the seams, closing off outside vents and air leaks, and controlling humidity with a dehumidifier or conditioned air. It's for Lexington-area homeowners whose crawl spaces are musty, damp or growing mold, or whose floors above feel cold and clammy. The goal is a crawl space that stays dry year-round instead of breathing humid summer air.
Signs your crawl space needs work
- A musty smell inside the house, worse in summer
- Condensation on ductwork, pipes or the underside of the floor
- Mold or dark staining on joists
- Sagging or torn insulation between joists
- Standing water or mud after rain
- Floors above that feel soft or cold
Why are Bluegrass crawl spaces damp?
Summers in central Kentucky are warm and humid, and the heaviest rain months fall in late spring and early summer. Humid outside air entering through foundation vents condenses on cooler surfaces underneath the house, and bare soil gives off moisture constantly. Where the crawl space sits lower than the surrounding yard, rain can also run in and stand. Encapsulation tackles both the air and the ground.
What goes into the job?
- Water first. If water enters, a perimeter drain and small sump may be needed before any liner goes down.
- Liner. A reinforced vapor barrier over the floor and up the walls, with taped seams.
- Air sealing. Closing vents, rim joist gaps and access doors.
- Humidity control. A crawl space dehumidifier or a supply of conditioned air.
- Insulation choices. Many encapsulated crawl spaces move insulation from between the floor joists to the walls.
Combustion appliances such as gas furnaces or water heaters in the crawl space need their air supply considered before vents are sealed, and Kentucky requires HVAC professionals to hold a state license or registration, so ask who will handle any HVAC changes.
What about radon?
University of Kentucky's BREATHE program says radon is a problem in many areas of Kentucky, including Fayette County, and that more homes there need testing. A sealed liner can be part of a radon system, but mitigation is a separate specialty. Testing before and after crawl space work is a good idea.
What affects the cost?
- Square footage and height of the crawl space
- Whether drainage or a sump is needed first
- Liner thickness and wall coverage
- Dehumidifier type and electrical needs
- Removal of old insulation or mold-damaged materials
The company you're connected with prices the job after an inspection. We don't quote prices.
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Common questions
Should crawl space vents be closed in Kentucky?
In an encapsulated crawl space they usually are, because humid summer air entering vents is a main source of moisture. Venting should only be changed as part of a full plan that accounts for any appliances there.
Does encapsulation help with radon?
It can be part of a radon reduction system, but it isn't the same thing. Test before and after, and use a radon specialist if levels are high.
Do I need a dehumidifier in an encapsulated crawl space?
Most encapsulated crawl spaces use either a dehumidifier or conditioned air to control humidity. The liner alone stops ground moisture but not humid air.
Related services
- Basement drainage systems
- Sump pumps and battery backups
- Foundation crack sealing
- Downspouts and surface drainage
More on sinkholes, permits and local rules: Fayette County karst basement guide.
Water at the footing, a leaking crack, or a crawl space that smells?
Call and a waterproofing company that works in the Bluegrass will come find the source.