I have 4-5 inch space which I want to fill with fiberglass batts
I can put R13 in which takes about 3.5 inch or I can put down R19, - howwver R19 is 6.5 inch deep, and I Know but pressing it into smaller space I loose on insulation capacity - ie less than R19 ..... If I press R19 into 4-5 inch space - how much R does it represent?
Does R19 presssed down to 3.5 inch like R13 batts, have a higher insulation value than R13 - or might I install R13 right away...