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Posted by marson on May 5, 2007, 8:14 pm
>
>
> >>I have an abundance of tar paper. Can I or should I use it as a vapor
> >>barrier?
>
> > Per the definition, no. Must be continuous.
>
> I am dealing with a cathedral ceiling and where the collar ties and where I
> have some cross beams It will be impossible to have a continuous vapor
> barrier... what is the way to deal with that?
You really ought to start a new thread. There are a few ways to deal
with this, depending on what exactly you have. you can cut rigid foam
to fit between the collar ties, and caulk (with acoustical sealant)
the poly to the rigid. You can also slit the poly around the collar
ties. In either case, caulk the foam or whatever to the collar ties.
Tape or caulk all seams. It's a bit of work, but it can be made
airtight.
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