Traditional building codes long mandated passive crawl space vents to allow outside air circulation, but modern building science often recommends sealing and encapsulating crawl spaces instead. Open vents in humid climates frequently draw in warm, moist outside air that condenses on cooler framing timbers, fostering rampant mold growth and wood rot. Consequently, modern best practices favor closed, conditioned crawl spaces equipped with vapor barriers and dehumidifiers.
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