Cover crawlspace floor

Insulation · Ventilation Systems · printed page 254 (PDF page 255)

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Text in the illustration

a crawlspace with an uncovered earth floor can contribute a very significant amount of moisture to the house environment - equivalent to several gallons
a vapor barrier (such as 6 mil polyethylene) should be laid down, sealed at the edges and joints, and ballasted with gravel
crawlspace
dirt floor
gravel
seal at edges
don't ventilate crawlspace

Generated explanation

A house cross-section compares an uncovered crawlspace earth floor on the left with a vapor-barrier-covered floor on the right. A red X, rising wavy lines, and pouring buckets illustrate the significant moisture contribution from exposed soil to the house environment. The right side, marked with a green check, shows a ground vapor barrier sealed at the edges and joints and ballasted with gravel. An annotation recommends a material such as 6 mil polyethylene. A prohibition symbol at the right foundation wall accompanies the instruction not to ventilate the crawlspace.

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Cover crawlspace floor

· p. 239

A schematic house section compares an uncovered crawlspace earth floor on the left with a vapor-barrier-covered floor on the right. Wavy lines rise from the exposed soil, and pouring buckets illustrate the significant am