Summary
Local building codes determine exact requirements for adding crawlspace vents, so contact your inspector first. In general, unfinished crawl spaces require one vent within 3 feet of each corner, with openings covered by a 1/4‑inch screen or a grate. The total ventilation area should be at least 1 sq ft per 150 sq ft of crawlspace floor. These guidelines don’t apply if the crawlspace is finished with a vapor retarder, insulated walls, and conditioned air with mechanical ventilation, in which case extra vents aren’t usually needed. Always verify requirements with your municipality before starting work.
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