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Old 09-20-2009, 10:51 AM   #1
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Insulating from the outside?


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.

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Old 09-20-2009, 10:55 AM   #2
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Insulating from the outside?


Yes you can put foam board on the outside & then reside
Are you sure the wall cavity insulation is around R13 & not older R7 ?
And that it is fully insulated?

I'd be inclined to rip the old siding off if not sure of wall cacvity insulation

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Old 09-20-2009, 11:06 AM   #3
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Insulating from the outside?


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?
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