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On the starter strip it says to leave a gap for drainage if water does get behind the siding. How big does this gap need to be and what is the spacing between them?
 

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For a starter strip I rip a piece of siding into two inch (2") strips. I then cut these into three feet (3" or 36") sections and leave about 1/4" to 3/8" gap between these starter strips. In this area I was taught that this was more for ventilation or breathing purposes. I can't imagine how water would get behind properly installed lap siding. Thanks, David
 
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