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Old 02-16-2011, 10:06 PM   #1
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Another Rigid Insulation over Block Question


Hi. I just joined this forum and was hoping to find a quick answer to my questions. I searched and read thru about 12 pages of info on this topic but now I'm more confused than before. I have a 1955 house in Pennsylvania with a brick face over block exterior. I am remodeling room by room and see that the interior walls facing outside just have 3/4" furring strips attached to the block wall with 3/8" drywall attached to the strips. No insulation. I thought I'd add some 3/4" rigid insulation between the strips before screwing new drywall back into the wood strips. I did some research and decided to go with Dow Super Tuff-R since it has better R value than the other type (styrofoam or lowe's brand). i was just going to glue/caulk it to the block wall, maybe spray some Great Stuff from the can into any cracks, maybe tape the joints then install drywall. Then I was wondering which side of the Dow board faces the drywall, there is a foil side and non foil. DOW reccomends a 1/2" air gap between board and drywall, also 1/2" drywall. Then I started reading hear about possible moisture issues. So do I skip any insulation and just put up new drywall to keep it simple? Or am I OK with the Super-Tuff or some other type of digid insulation? Thanks.

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Old 02-16-2011, 10:25 PM   #2
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Another Rigid Insulation over Block Question


I forgot to add a few things...the house has central air and heated by gas forced air. Since DOW reccomends an air gap should I use 1/2" insulation and 1/4" gap? Should I use 1/2" drywall instead of the 3/8?

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