Hey there,
We have a split level home in climate zone 5 with an upstairs bathroom where one particular wall is 1/2 shared with the lower level, 1/4 shared with an uninsulated attic, and 1/4 completely exterior. Image below if it's not clear: https://imgur.com/a/lkk1kU0
Previous owners had multiple layers of 3.5" faced fiberglass stacked together between bathroom and crawlspace. Single 3.5" batts on the right hand exterior wall portion. The walls are 8" deep cavities.
The batts are old and need to be replaced. I was a little sketched out that there was nothing in between the batts and the crawlspace - some of the batts weren't properly stapled, so there was sag, and some voids.
My tho
