Crawl Space Repair · Nashville, TN
Insulation & Air Sealing in Nashville
Wet fiberglass removed, rim joists sealed and perimeter walls insulated — the arrangement that actually works in this climate.
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What is going on under the house?
Straight to us, and a reply the same day.
Insulation & Air Sealing in Nashville, Tennessee
Wet fiberglass removed, rim joists sealed and perimeter walls insulated — the arrangement that actually works in this climate.
Nashville's Crawl Space Repair does insulation & air sealing for homeowners across Middle Tennessee — licensed, insured, with the price in writing before the work starts. Crawl space contractors who fix the water before they sell the plastic, and repair the wood that needs it rather than all of it.
Why homeowners call
What sends people under the house
- Musty smell you have stopped noticing
- Floors that dip toward the middle
- Insulation hanging down or on the ground
- Standing water under the house
- Hardwood above cupping in summer
- Buying and the inspector flagged the crawl
What is included
The work inside insulation & air sealing
- Wet and fallen fiberglass removed and disposed of
- Rim joists air-sealed, which is where most of the leakage is
- Perimeter walls insulated rather than the floor above
- Foam board or closed-cell applied to suit the space
- Ductwork sealed and insulated while access is open
- Pest and moisture damage flagged as it is found
Insulation & Air Sealing under a real house, step by step
Fiberglass batts stapled between the floor joists is the arrangement almost every crawl space in this region was built with, and it is the wrong one. It holds moisture against the subfloor, it falls down over time, and it rots the wood it was meant to protect.
Once the crawl is sealed and conditioned, the insulation belongs on the perimeter walls rather than the floor. That brings the space inside the envelope, which is the whole point — and it is why insulation and encapsulation are one decision rather than two.
Also available
More crawl space repairs we handle
Structural Repair
Sagging floors supported on adjustable steel jacks and proper footings, with rotten girders, joists and sill plates replaced.
Learn moreEncapsulation
Heavy vapor barrier across the floor and up the walls, vents sealed, and the space conditioned rather than ventilated.
Learn moreMoisture & Dehumidification
Dedicated crawl dehumidifiers sized to the volume, with humidity monitored rather than assumed.
Learn moreDrainage & Sump Systems
Interior drainage, sump pumps with battery backup and exterior grading, done before anything is sealed.
Learn moreInspections & Reports
A photographed report of what is under there, with moisture readings and a clear split between urgent and monitorable.
Learn moreService area
Crawl spaces repaired throughout Middle Tennessee
We go under houses in Nashville plus 64 towns more, across 12 counties; if you are in Middle Tennessee and around an hour from Nashville or closer, you are covered.
FAQ
Under the house: insulation & air sealing questions
Why is the insulation under my floor falling down and wet?
Fiberglass batts between the joists absorb the humidity in a vented crawl space, get heavy, sag and fall, and while they are up there they hold moisture against the wood. It is the standard arrangement in older houses and it is wrong for this climate. The fix is removing it, sealing the rim joists, and insulating the perimeter walls of a sealed crawl space instead.
Where should crawl space insulation go — floor or walls?
Walls, in a sealed crawl space. Insulating the perimeter walls and the rim joist brings the crawl space inside the house’s thermal envelope, keeps the ducts and pipes down there in conditioned air, and keeps the floors above warmer in winter. Floor insulation belongs in a crawl space that stays vented, and that is the arrangement being moved away from.
Free estimate
Need insulation & air sealing under your house?
Tell Nashville's Crawl Space Repair what you are noticing upstairs and what you know about the crawl. We go under with a meter and a light, then put a no-cost estimate in writing for the repair the readings call for.