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Crawl Space Don'ts - Crawl Space Bad Building

  • Don't put a vapor barrier or rigid insulation board on the ceiling of your crawl space (unless your home is on stilts).
  • Don't close vents without sealing the earth off.
  • Don't seal the earth off without closing the vents.
  • Never use a fan to blow outside air into your crawl space.
  • Never use a fan to blow air out of your crawl space if the make up air is coming from outside.
  • Don't install a liner or concrete without removing organic material such as wood, cardboard, insulation, etc., from the dirt floor first.
  • Don't depressurize a space that has combustion appliances (more than one pascal)

How Stuff Works - Explanation of how a crawl space is built and why a crawl space has several advantages over basement and slabs.

Wikipedia - Description of different types of basements including crawl spaces.