The front door of your crawl space deserves to actually close.

What to know about crawl space doors, and when it's the right call.

A crawl space door works by closing the largest single opening in your foundation perimeter the same way an exterior door protects your house: with a fitted panel, a solid frame, and a seal between them. The door panel is sized to the masonry or framed opening, mounted so it sits flush, and sealed at the frame so wind-driven rain and humid air cannot slip around the edges. Durable materials, composite, treated, or corrosion resistant metal, keep the fit tight through years of sun, rain, and temperature swings that warp plywood and rust bare steel. A positive latch keeps the door closed in wind. The result is a perimeter that only lets in what you choose to let in, which is the foundation, literally, of keeping the space dry. The door is one piece of a sealed perimeter: it closes the largest opening while fitted covers close the vents that admit weather, and together they stop the rain and humid air that were using the openings. If the space behind the door already shows dampness or odor, start with the routes on our crawl space moisture page so the new door seals a space that is drying rather than one still being fed.

The symptoms that usually lead to crawl space doors are on the crawl space repair problem signs page, alongside the other signs that point to the same underlying cause.