The biggest threat to a healthy, durable home is moisture. Billions of dollars a year are spent repairing moisture damage to homes.

Good indoor air quality is compromised by high humidity which encourages mold growth.

Homes dry when heated. Insulation slows the flow of heat, and air conditioning makes the interior cool when it’s hot outside.

Making materials cooler often makes them wetter so modern homes are more vulnerable to moisture.

Protecting them requires understanding the permeability of materials, avoiding vapor barriers.

Materials that are hygroscopic rather than hygrophobic or that help redistribute moisture can be quite useful.

Knowing how and when to employ construction methods that enhance drying can significantly contribute to the durability of a home.

The homes heating, cooling and air distribution system functions in direct relationship with the insulated enclosure to manage moisture.

The two should be considered and developed together in the design studio and not improvised during construction.

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If the enclosure fails to retard moisture, the cooling equipment can be overwhelmed
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Mold on crawlspace framing
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Mold near insulation gap at light fixture
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Mold inside duct work
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Wood floor absorbing moisture from the crawlspace and cupping
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Solar vapor drive through brick wall to over-cooled wainscot
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Crawlspace as "inside" space
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Crawlspace sealed and insulated
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Crawlspace as "inside"