Your standard procedure for insulating basement walls is well explained - build a 2x4 wall 1.5 inches from the basement wall and use R20 Batts. One question - my R20 package indicates the batts are 15.5 inches wide - will this not lead to a .5 inch vertical gap between the batts at the basement wall if the 2x4 wall is 16 inches O.C.? If so can I assume any heat loss would be minor?
Answer:
Actually, the 2X4s are 1.5" thick so the gaps between them are 14.5" - this makes for negligible compression once the bats are installed.
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