Recent research provides plenty of evidence that vents for crawlspaces don't work, and that sealed and conditioned crawlspaces are a better choice. But my business, the Healthy Building Company, is the first I know of to specialize in applying that science in the field. We've been sealing up crawlspaces in houses with moisture and mold problems for five years, and we're taking on an increasing volume of work building dry crawlspaces for new homes.

We've developed a set of simple, effective, and repeatable methods that produce predictable results. In this article, I'll describe what they are, and how we deal with various obstacles that may crop up along the way.

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