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Pjartsmile 09-11-2010 10:56 PM

Adding to existing wall insulation in basement?
 
Hi, I live in a 70's bilevel. The walls in the basement are finished halfway up with wood panelling 7R insulation with 2x2's and no vapour barrier. Then from the middle up to the ceiling is gyprock and the same beneath. Can I just add a 2x4 with R12 and vapour barrier then gyprock on top of that? I just want to increase the R value to make it more energy efficient with out the extra cost and work? It is cement half way up. (not blocks). I live in a very cold climate. Canada (:

Gary in WA 09-15-2010 06:34 PM

Search: basement wall insulation, above. You need to isolate the concrete from the basement air with foam board: http://www.buildingscience.com/docum...ent-insulation

http://www.buildingscience.com/docum...gs?full_view=1

Gary

Pjartsmile 09-19-2010 02:06 PM

isolating the conrete from the basement air...
 
As of now the cement wall has fiberglass insulation against it with 2x2, and then the ugly wood panelling. Doesn't seem to be any moisture issues even after all these years. I thought if I left that on an added the 2x4 with R 12 then vapour barrie that would keep it from leaking air to the conrete. Remember this is only a 4 foot wall. This would save demolition work. Where would the inside air come from if it is sealed well? Thanks


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