We have a house from 1963 with 2 out of 4 walls constructed as follows:
And the remaining two with panel instead of brick and air gap.
We have removed the inner porous fiberboard (Treetex) and plan to mount gypsum boards on all walls instead. The paper behind, YAC 400/150, has some holes in it and will get more as the electrical work is done. Should we replace it? I assume it should be replaced with something similar. What alternatives are there?
