March 2007
by Mike Guertin
A rain screen offers the ultimate defense against water intrusion, provided you get the details right. That's easy enough to do with lap siding but considerably more complex with shingles. Custom home builder and remodeler Mike Guertin, who is accustomed to wind-swept rains in his area of the Ocean State, explains the different venting options available and provides practical trim details for best-practice wall shingling in coastal situations.
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Best-Practice Wall Shingles A rain screen offers the ultimate defense against water intrusion, provided you get the details right Mike Guertin Figure 1. The author's first experiences with venting shingles relied on back-kerfed 1x3 furring strips. These back kerfs are essential for allowing water to drain out and air to flow between the horizontal strips, but cutting the kerfs with a dado blade in a radial arm saw proved too labor intensive. In the Ocean State — where wind-swept rains aren't restricted to nor'easters, tropical storms, and hurricanes — I count on a vented rain screen coupled with carefully detailed
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