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Any harm in adding varied thickness of rigid foam?
I have a 2x4 framed 70's house undergoing a small addition.
I was thinking of wrapping the outside of the original house in rigid foam board and air sealing to gain insulation.
To fur the wall out so it is plumb, I will have varying thicknesses of foam. Is that a problem? Can I do damage moisture wise if I use too little or too much foam on the outside?
If you gain several inches of foam on the outside wall of an existing house. Can you leave the old windows "inset", or should
you reinstall with plywood framing around the edges of the window like in new foam wall construction. If you leave them inset what would that flashing process look like?
Wow! lots of questions for a retrofit foam job.
Thanks for your thoughts.