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Preventing water penetration under framed wall on flat deck

Preventing water penetration under framed wall on flat deck

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  #1  
Old 02-26-13, 07:37 PM
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Preventing water penetration under framed wall on flat deck

I am planning to frame off part of a deck to make a mud room. The area in question (9' x 10') is under an existing roof - see crude mockup in image. At one side the frame will be along the deck edge and so water penetration will not be an issue if the siding ends below the deck surface. However, along the other wall (green arrows) the frame will rest directly on the deck. While water will drain between the decking, I am worried about the long term effects of water penetration at the bottom of the frame against the deck planks. I would use treated lumber for the base plate but I'd still like to somehow minimize water penetration - what's my best approach? should I just caulk or use something more elaborate, perhaps laid under the base plate.
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Old 02-26-13, 08:36 PM
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I would try to find some membrane strip to install under the base plate or against it.
 
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