Crawl Space Encapsulation in Summertown, TN

A crawl space in Summertown might have a poured stem wall, dry-stacked block, or piers with skirting, sometimes all three under the same roof after decades of additions. Encapsulation has to start with what is actually there, not with a standard kit.

The second thing shaping the work is the water. The community is drained by the North and South Forks of Saw Creek, which run west into the Buffalo River, and the Buffalo runs northwest to the Duck.

A crawl space on a Saw Creek tributary hollow will carry damp soil from spring through autumn, and in a wet stretch it will hold standing water at the low end. Vents that were supposed to dry the space out do the opposite here for most of the year, pulling humid Tennessee air in under a cool floor where it condenses on the joists. We see the same results over and over: fallen fibreglass batts, mould on the underside of the subfloor, cupped hardwood above, and a musty smell that never quite leaves the house.

Sealing the vents and rim. Foundation vents are closed and sealed from the inside. The rim joist, which is usually the leakiest part of the whole floor system, gets sealed with foam at the same time. Once this is done, outside air stops moving through the space.

Drainage and sump where the ground water calls for it. On the wetter lots along the creek forks, a liner alone is not enough. If water enters the crawl space, it needs somewhere to go. That means interior drainage at the low points and a sump pump with a sealed basin, installed before the liner goes down. We will tell you straight whether your space needs this.

Conditioning the space. A sealed crawl space still needs its air managed. Depending on the house, that is a small duct from the existing system or a dedicated dehumidifier sized for the space. This is what keeps humidity down through a Lawrence County summer.

• Homes in the Saw Creek hollows. If your lot drains toward the North or South Fork, ground moisture is your main enemy and the liner plus drainage is where the money goes first.
• Older farmhouses with dirt floors. Bare earth under a house is a humidity source twelve months a year. Covering it changes the whole house.
• Pier and skirted homes. These are the hardest to keep dry because air moves freely. Sealing and lining makes the biggest single difference here.
• Homes with fallen or sagging floor insulation. The batts fell because the space is damp. Fix the space first, then the floor insulation becomes optional rather than essential.
• Musty smells indoors. If the house smells like the crawl space, the crawl space is part of your breathing air. That is the stack effect, and sealing the floor stops it.

The temptation is to do the easy eighty percent and leave the awkward corners. We photograph the finished space so you can see the parts you will never crawl under to check yourself, and we do the awkward corners first, not last.

See our full crawl space encapsulation service, our spray foam insulation work, or the complete service area.