above grade block insulation
Just finished reading this thread. Great info Dana. I have a couple of questions. I have a cement block wall above grade. This room is pretty cold in the winter. The wall was insulated with 2 inch unfaced fiberglass bat between the 2x2 furring that is nailed into the block, covered with plastic and 5/8" drywall. Ideally I would like to remove the wood strips and cover the wall with 2" xps foam and then studs and then drywall. However, i'm conserned on how to attach the wood to the block thru the foam since I can't see where the screws are going into the block (hollow part or web or mortar joint) and the damage to the block removal will cause. Other option is to leave the 2x2's in place and glue 1.5" xps in between (2x2's are really 1.5") and then drywall.
If the drywall is touching the xps will is absorb the moisture coming thru and get moldy?
Should I use 1" xps leaving 1/2" gap between the xps and drywall?
Any real benefit to doing any of this verses just leaving the 2'" unfaced fiberglass and plastic sheeting?
Any other ideas?
By the way the drywall is down.