[Greenbuilding] PU foam

[Vadurro, Rob, EMNRD]

Regarding vapor permeability and PU foam, I mentioned that PU foam was
vapor permeable because our local inspectors allow PU roofs to be
installed over un-vented roof joist space because they consider the PU
vapor permeable enough to not require the additional joist venting. I
don't know how this squares with the recent discussion here- perhaps
we're talking about two different properties that have similar names?

-Rob Vadurro



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