Crawl space encapsulation in Murfreesboro
A sealed crawl space keeps humid air and ground moisture out from under your floors. On Central Basin limestone, it's usually paired with drainage.
Encapsulation closes off a vented crawl space and turns it into a sealed, dry part of the house. For Murfreesboro homeowners dealing with musty air, sweating ducts or damp insulation, a contractor seals the vents, covers the ground and walls with a heavy liner, and adds a dehumidifier or a supply of conditioned air to keep the humidity down.
What's included?
- Closing foundation vents and sealing gaps around pipes, wires and the access door
- A heavy ground liner with overlapped, sealed seams, fastened up the foundation walls and around piers
- An approved air control method, usually a dehumidifier
- Often, insulation moved from the floor to the walls and rim joists
When does it make sense?
- The house smells musty in summer
- Ducts or pipes drip under the floor
- Floor batts are wet or falling
- The existing plastic is torn or incomplete
- Mold has been cleaned before and came back
Why drainage usually comes first here
Rutherford County's thin clay soils over limestone send rain sideways along the rock, and some crawl spaces end up being the low point. A liner laid over a crawl space that floods will just hold the water. Contractors here often start with gutters, downspout extensions, regrading or an interior drain and sump pump before sealing anything.
What does the code say?
The City of Murfreesboro has adopted the 2024 International Residential Code. Its unvented crawl space section requires a continuous vapor retarder over the exposed earth with seams lapped and sealed, carried up and sealed to the stem wall, plus one approved air method: continuous exhaust, a conditioned air supply, using the space as a plenum, or dehumidification sized at 70 pints a day per 1,000 square feet. Outside city limits, ask Rutherford County Building Codes or your town's office which code edition applies.
How a job usually goes
- Inspection for water entry, mold, wood damage, pests and plumbing leaks
- Drainage work if water gets in
- Removing old plastic, wet insulation and debris
- Sealing vents and penetrations
- Installing the liner on the ground, walls and piers
- Setting up the dehumidifier or supply air, plus its drain
What changes the price?
- Size and height of the crawl space and how much rock or uneven ground there is
- Liner thickness and how much wall area is covered
- Drainage or sump work needed
- Mold cleanup or wood repairs
- The air control method and electrical work
The contractor you're connected with prices the job after an inspection. We don't publish prices.
Common questions
Can a crawl space with exposed rock be encapsulated?
Usually, yes. Contractors work the liner over and around rock, but uneven ground can take more time and material, which affects the price.
Does Murfreesboro allow sealed crawl spaces?
Yes. The city has adopted the 2024 International Residential Code, which includes rules for unvented crawl spaces.
Do I need a dehumidifier after encapsulation?
You need an approved air method. A dehumidifier is the most common choice, but a conditioned air supply or continuous exhaust are also options under the code.
Where this service is available
Related services
- Crawl space drainage and sump pumps
- Dehumidifier installation
- Crawl space mold cleanup
- Sagging floor repair
Background on Tennessee licensing, the city code and the limestone under Rutherford County is in the Rutherford County crawl space guide.
Water on the rock, a musty house, or a floor that dips?
Call and we'll put you in touch with an independent crawl space contractor who works in Murfreesboro and across Rutherford County.