26 Oct '11, 3pm

under slab vapor barrier and insulation taped? #green

Do I need to tape seams in the vapor barrier and xps that will be under my slab-on-grade house foundation? I read Joseph Lstiburek's article on concrete floor problems and his assertions regarding air movement and vapor diffusion lead me to assume that overlapping the barrier would be effective since there won't be much air movement at all under the slab. Also, tape the xps? I haven't found much in the way of tape that sticks well to it, particularly if it's cool and damp out - which is the dominant weather here now.

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