OK, let’s hear how y’all handle this.
Slab about to be poured, I am now installing the moisture/vapor barrier and 2″ XPS. There are numerous pipe penetrations that mostly come up into walls, a few into cabinets. There are a few conduits also. It is of course impossible to cut the barrier material (Stego) perfectly, so the question is about sealing around them. The manufacturer offers 5 gallon pails of a mastic for this purpose. I would only need a tenth of that. As an alternate they say you can make a “boot” out of scrap pieces, tape it around the pipe, and to the main sheet.
Which do you do and/or see in practice? How much do you think it matters?
Also, what canned foam do you think works well to seal around the pipes as they come thru the XPS?
Replies
Use the scrap method. Tyvek tape to do the seams. I just use Great Stuff to patch/glue the XPS. That said, you won't get all that much vapor &/or heat transfer thru the small gaps in the membrane/foam that you'll be dealing with.
Mike Hennessy
Pittsburgh, PA
a bucket of tar
wrap scrap and duct tape for me
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I don't have any photos handy. Few of the penetrations are just one pipe all by itself. In more than one place I have a couple of pieces of pex plus an ABS drain... in another several PVC conduits all lined up to rise to the panel... I'm sure you get the picture. No way that tape will really seal around these things, but it will have to do.
spray foam in can
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foam pipe slevees...
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