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Is a crawl space required by code?

Access to the crawl space must be provided through openings that are no smaller than 18 x 24 inches if they are in the floor, or 16 x 24 inches if they are the perimeter walls of the crawlspace.

Why is a crawl space necessary?

What is the Purpose of a Crawl Space? A home built over a crawl space sucks up water vapor from the earth and allows it to enter the home. Crawl spaces were built to provide a buffer between the house and its inhabitants and the damp, wet earth below.