I have to replace the original sheetrock in a bathroom ceiling. Attic
insulation is a little bit of 1950's era rock wool and trying to reuse
it is not worth the trouble, so I plan on throwing a couple of bats of
the pink stuff between the 2X6 joists.
Should I get faced insulation, installing the facing against the
ceiling sheetrock or should I go with unfaced? Does it make any
difference that it is a bathroom and any air escaping will be humid?
Use unfaced if you are adding to the existing insulation. Use faced
insulation otherwise, and get the thickest stuff you can find. Seal
around every opening crack you can find with caulk before you insulate
to prevent moist air escape.
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