March 2008
Understanding Water Intrusion
First 100 Words:
Soundings: Understanding Water Intrusion The power of wind-driven rain may be more insidious than you think Rain falls from the sky. That's no news flash, but it's curious how conditioned we have become to expect that … and only that. Coming from above, we expect rainwater to flow downhill, and we detail the exterior accordingly: we lap roofing, housewrap, flashings, and siding with the bottom layers under the top, so the surfaces that will be presented to the weather shed water down and away from the structure. Reverse lapping (installing the bottom course over the top course) is a sin;
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