I have a 1968 raised ranch. The lower level is very cold. The walls are completely finished. There is only 1" between the cinder blocks and the drywall.

Q1: Is there any insulation that I can blow-in that is waterproof?

Q2: Can I blow it into the holes in the blocks? And will that help?

Q3: If not, is there a 1" thick insulation board that I can slide in between the blocks and drywall that is appropriate?

If I am totally off track, please let me know what I should be doing.

Thank you for your help.