Crawl Space Questions, Answered

A vapor barrier (also called a ground cover or vapor retarder) is a sheet of heavy plastic laid over the soil in a crawl space. Bare soil releases moisture into the air under your home; covering it slows that down. Washington's residential code calls for a ground cover in vented crawl spaces — six-mil black polyethylene or an approved equal, with overlapped seams, extending to the foundation walls (WAC 51-51-0408). More about vapor barriers.

Encapsulation goes beyond a ground cover. A heavier liner is run over the ground and up the foundation walls, seams and edges are sealed, and openings to the outside are addressed so the crawl space is treated as a closed space. Some encapsulated crawl spaces also use a dehumidifier or another way of managing the air. We set the scope to your home and handle any existing water problem first. More about encapsulation.

Damp soil and humid air can lead to musty odors, wet or sagging insulation, rusting metal, and conditions where wood framing stays damp longer than it should. Over time, persistent moisture can contribute to rot and attract pests. We find the source and fix it with the right barrier, encapsulation, drainage or insulation.

Yes, when the odor comes from damp soil or moisture in the crawl space. Smells can also come from wet insulation, debris or pests, so we check the whole space and take care of every source.

When liquid water shows up — puddles, mud that never dries, water sitting on top of the plastic, or water lines on the foundation walls — especially if it returns every rainy season. A drain system collects that water and moves it to a sump pump or outlet. More about drain systems.

When water collects at a low point in the crawl space and can't drain away on its own, a sump pump moves it out. It is usually paired with drain pipes, and we'll point out any gutter or grading fixes outside that help too. More about sump pumps.

Common signs are insulation hanging down or lying on the ground, batts that look wet, matted or stained, missing sections, and floors that feel cold in winter. You may also notice it torn up by pests or by past work. More about insulation.

Usually not. Floors slope or bounce because of a damaged post, a sagging beam, a settled pier block, moisture damage to framing, or the way an older house was built. We inspect, find the cause and fix it. Why floors become uneven.

Post and beam repair fixes the wood (and connectors) that hold up your floor framing. Floor leveling is the goal of bringing a sloping floor closer to level, usually by adjusting or adding support. Foundation repairs deal with the concrete — stem walls, footings and piers. A single project can involve one, two or all three.

We talk through what you've noticed, inspect the crawl space, explain what we found in plain language, and give you a free, straightforward estimate for the work we recommend. You decide what happens next.

Every crawl space is different in size, condition and access, so we price each job to the work it needs. Your estimate is free and spells out the work so there are no surprises.

Getting started is easy. Call or text (360) 470-4956, or fill out our estimate request form. We'll learn what's going on beneath your home, schedule a time to take a look, and give you a straightforward estimate.

Yes. Crawlspace Pros is licensed, bonded and insured. Our Washington contractor license number is OUTSIOG746BH. You can look up any contractor through the Washington State Department of Labor & Industries "Verify a Contractor" tool.

We fix the moisture problems that lead to musty, damp crawl spaces: we clear out wet and contaminated materials, handle water with drainage, and seal the space with a new vapor barrier or encapsulation.