Guides
Crawl space guides
How vented and closed crawl spaces work, what encapsulation involves and what it costs, and what to do about humidity, water and mold under the floor.
How a crawl space works
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Start here
Crawl spaces: how they work and what can go wrong
What a crawl space is, how vented and closed designs differ, the signs worth checking twice a year, and who to call when something’s wrong.
Read the guide: Crawl spaces: how they work and what can go wrong -
Crawl space humidity and moisture
What crawl space humidity and wood moisture readings mean, how to measure them properly, why humidity rises and when to call someone.
Read the guide: Crawl space humidity and moisture -
Crawl space vents: open or closed?
Whether crawl space vents should be open or closed, what the code requires, why blocking them backfires and how to seal them properly.
Read the guide: Crawl space vents: open or closed? -
Crawl space insulation: floors, walls and rim joists
Where crawl space insulation goes in vented and closed crawl spaces, how much the code requires, rim joist insulation and the mistakes to avoid.
Read the guide: Crawl space insulation: floors, walls and rim joists
Encapsulation
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Crawl space encapsulation: what it is and when it’s worth it
What a complete crawl space encapsulation includes, when it’s worth it (and when it isn’t), what the code requires and how to read a quote.
Read the guide: Crawl space encapsulation: what it is and when it’s worth it -
Crawl space encapsulation cost and repair prices
What crawl space encapsulation and related repairs cost, from real Virginia jobs in 2026: what drives the price, running costs and structural repairs.
Read the guide: Crawl space encapsulation cost and repair prices -
Crawl space vapor barriers and liners
Which crawl space vapor barrier thickness to use, what the code requires, how to install it as one sealed sheet and when it needs replacing.
Read the guide: Crawl space vapor barriers and liners -
Crawl space dehumidifiers
When a crawl space needs a dehumidifier, how to size it from the code, how to install and drain it, and the mistakes that make it fail.
Read the guide: Crawl space dehumidifiers
Water and mold
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Water in the crawl space
Why there’s water in your crawl space, how to tell the four sources apart, which fixes match each one and what to do after a flood.
Read the guide: Water in the crawl space -
Crawl space mold removal: what you can clean and when to call a pro
When you can clean crawl space mold yourself, how professional remediation works, the shortcuts to avoid and how to keep it from coming back.
Read the guide: Crawl space mold removal: what you can clean and when to call a pro
