July 2007
by Steve Easley
Along the coast where wind-blown rain is a regular weather feature, it's no surprise to builders that the exterior of a home must be carefully detailed to manage water. Properly installed housewrap and flashing are the key elements of an effective water-resistive barrier. But rainwater is not the only moisture source, explains building-science consultant Steve Easley. The air itself, particularly the humid air associated with coastal regions, carries a significant moisture load as well. This means that sealing up air leaks is a vital step to managing moisture.
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Air Leaks: Hidden Moisture Movers While wind-driven rain is a primary source of problem moisture, air leaks run a close second Steve Easley Along the coast where wind-blown rain is a regular weather feature, it's no surprise to builders that the exterior of a home must be carefully detailed to manage water. Properly installed housewrap and flashing are the key elements of an effective water-resistive barrier, which is essential to protecting walls (see "Common Callbacks," January/February 2007; www.coastalcontractor.net). But rainwater is not the only moisture source. The air itself, particularly the humid air associated with coastal regions, carries a significant
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