Factors influencing the moisture conditions in crawl spaces

The combined effect of ground cover and ventilation levels on the moisture content (MC) of wood framing members in crawl spaces was investigated. The experimental design included three ventilation and four ground cover levels. Temperature-compensated, resistance-type moisture probes were used to monitor MC. Results showed that, with venting reduced to 1 ft.2 per 1,500 ft.2 of floor area, adequate protection against high MCs could be obtained with as little as 90 percent ground cover. Results also showed that wood MCs could vary significantly within a relatively small crawl space.

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