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I always try to isolate lumber from any type of masonry whether it is pressure treated or not. I mean why not? The stuff is cheap. But we have a fairly big bug problem out West. I like to use tar paper, but any isolation membrane will work.
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I have a job coming up which requires installing treated SYP 2x over an exsisting exterior concrete slab, and adding a access ramp. My question is, should I take the time to use a vapor barrier between the slab and sleeper, or go over top without it.
*seems like a pretty good idea.
*Tom Pressure treated lumber is designed to be use in situations where lumber comes in contact with masonry. If you are putting PCT decking over your sleepers, I don't see the need for a vapor barrier. Just Guess'n Shakey Jake
*I always try to isolate lumber from any type of masonry whether it is pressure treated or not. I mean why not? The stuff is cheap. But we have a fairly big bug problem out West. I like to use tar paper, but any isolation membrane will work.
*Tom,If the application is outside, and you use treated SYP, I don't think the vapor barrier will do any good. I wouldn't worry about it.Ed. Williams