Moisture can be the nemesis of today's more tightly-built wood-framed homes. Creating a tight building envelope is only one part of the equation in building high-performing, energy-efficient homes. If it's not coupled with strategies for letting accumulated moisture out of wall cavities, it can be a recipe for disaster. For several years, NAHB's Building Product Issues Committee has tracked the adverse effects of unwanted excess moisture in homes. Most of the recurring themes have been identified to be specific to certain regions of the country and exterior cladding systems. Building code requirements have changed in response to the need for more robust weather-resistance performance of exterior envelopes. Product specifications and performance requirements have changed as well, but it's often hard to keep on top of all the code and technology changes that are happening in the industry.
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