I have a small addition with a board and battan finish. Can i put a styrofoam insulation on the outside and refinish it with the b and b again. The inside has batt insulation and vapour barrior but is always colder in the addition. Will this work to increase r-value? Thanks for your responses.
The styorofoam is r10 or r12 to be going on the outside, and the inside are old batts in 2x4 wall. I would rather not take off old siding and just go over, much easier. Only thing is about vapour barrier issues, is this correct to have foam on the outside which is a vb itself and then batts and vb inside?