Polyiso foam in basement: a rim joist question
Love this site, great hints
Now Im in Rockland county a little north of NYC and have a 2007 2 story colonial
I have added to the R38 with another 8" of cellulose and now am looking at the basement.
It is unfinished but I has r19 batts in the ceiling (unfinished)
So I was looking at putting 2" Poly Iso board glued to the basement walls, the ceiling height is 8ft so perfect fit for the boards
My question is the rim joist I did a cheap job of putting blocks of 1" expanded polystyrene in and sealing with Great Stuff, now if I put up the Poly Iso do I need to add another 1" of say spray foam (no time for patience to cut all those board pieces again) or because the boards are flush with the ceiling and basement wall, there will be no more humid air touching the foam blocks I put in.
Im worried that I need to add more because before I put the blocks in the batt plugs the builder put in where wet.
So do I need to add anything else to the joist space or because the iso will be flush with the floor joists once I put up sheetrock on the framed walls and ceiling I should be ok
Id hate to make a mistake to find rotting sill plate in 10 years
Any advice would be appreciated
PS I will mention this again, I LOVE THIS SITE!!
Posted Tue, 02/11/2014 - 13:23
Edited Tue, 02/11/2014 - 13:51
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