1

I have a city house that is over 100 years old and the bedroom has two exterior walls made of brick. Inside the walls are plastered over. Normally, I would just add 2” framing and use polyiso foam. This time under the paneling I see that used 1x3 furring strips and put fiberglass batts. Says it is R9 which is hard to believe being that the furring is actually less than an inch and fiberglass should not be packed.

My question is how much is lost by crushing the fiberglass and should I just replace it with 2” R13 polyiso foam board. Will it make that much more of an improvement?

Thanks

Improve this question

1 Answer 1

Reset to default
2

The chart I have shows the R values of compressed insulation. My take away on this is that you have only an R value of 3.3enter image description here

Going with the foam would be a nice step up.

Improve this answer

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.