Drying out the space under the floor

Most of what goes wrong under a house in this city is slow. No event, no phone call the night it happens, just a floor that feels cold, a musty smell in one room, and insulation that quietly fell out of the joists two winters ago. The cause is almost always water that should have been sent somewhere else outdoors.

Riverbottom clay does not drain

Ground along the Arkansas River, Lee Creek and Frog Bayou around Van Buren is bottomland: low, broad, and clayey from eroded shale. Water that gets into it leaves slowly. A crawl space cut into that ground sits in a bowl, and it stays damp for weeks after the yard surface looks dry.

The soil map explains why two neighbors have different problems. The county holds river bottom, creek valley and mountain soil, all in one jurisdiction. Uphill in the Boston Mountains foothills, thin soil over sandstone drains fast and the crawl space problem is bulk water arriving during a storm and leaving after it. Down in the bottoms it is standing moisture that never really leaves, and the two need different repairs.

1. You callOne number per county. The dispatcher takes the address, the ZIP and a short description of what happened.
2. A local crew calls backAn independent restoration contractor already working that county rings you directly and sets a time.
3. They look, then scope itNothing is priced from a phone call. The crew walks the building, takes readings, and writes a scope you can hand to your adjuster.

The usual culprits, in the order they should be checked

Downspouts are first, because they are free to fix and they are wrong more often than anything else. A downspout dumping at the corner of a house delivers hundreds of gallons off a roof to exactly the spot you least want it. Extending it six or eight feet solves a surprising share of crawl space calls outright, and any honest crew will say so rather than sell equipment.

Grade is second. Soil that has settled toward the foundation over twenty years sends every rain under the house. Third is the vents: blocked by shrubs, packed with debris, or on a house where the vents were closed one winter and never reopened. Fourth is plumbing, a supply line drip or a leaking drain that has been running under the floor unnoticed. Only after all four is it worth talking about groundwater or the river.

• Downspouts discharging within a few feet of the foundation
• Grade fallen back toward the house so surface water runs under it
• Crawl space vents blocked, buried or closed and forgotten
• A slow supply or drain leak running under the floor
• Missing or torn ground cover over bare soil
• Ductwork sweating in summer and dripping onto the ground below

What drying the space involves

Bulk water comes out first, pumped if there is standing water and mopped or vacuumed from low spots. Wet fiberglass batts that have fallen or sagged are removed rather than pushed back up, because compressed wet insulation does not recover and it holds moisture against the subfloor. Debris and old construction scrap on the soil comes out with it.

Then the space is dried with air movement and dehumidification, with readings taken on the joists and the underside of the subfloor rather than on the air alone. Wood is the thing being dried; the air is just the vehicle. When the framing reaches normal moisture content, the equipment comes out and the reason it got wet gets fixed, in that order.

A ground cover of sheet polyethylene over bare soil, lapped and held down, does more for long-term dryness than any machine, because it stops evaporation from the dirt into the wood above it. Whether the space should then be sealed and conditioned or left vented is a judgment that depends on the house, and it is worth a conversation rather than a default.

When the river is actually involved

Sometimes it genuinely is. In December 2015 the Arkansas near Van Buren crested at 34.63 feet and pushed backwater into mobile home parks near Lee Creek, and in June 2019 it reached 40.79 feet with Lee Creek at 416.90 the same day. On a bottoms address, floodwater under a house is dirty water, and it is handled as such: insulation out, the underside cleaned, the framing dried and the soil covered afterward.

The distinction is worth insisting on. A crawl space wet from a gutter is a maintenance problem. A crawl space that took river water is a contamination problem, and treating one like the other either wastes money or leaves the job unfinished.

Common questions

Photograph what you can, move what is loose, and call the county number.