Question:

My new house has 1/2 pink rigid foam insulation (R2.5) glued to the perimeter walls of my basement (Ceiling to floor). I framed the walls and complimented the existing pink rigid foam with R14. I placed the R-14 snug aginst the pink (not compressing) do I need a vapour barrier and if I did use it, would it cause problems? Is this method of insulating a basement good?

Answer:

lUnoftunately you already have a VB and its on the wrong side of the insulation. Once rigid, high density foam is 1.5" thick, it serves as a VB. You'll be best off to take the foam off and start over because you'll want VB over the R-14 but if you have one also on the othere side, you'll attract condensation like you would not belive.

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