OK -
I have a dormer end wall that's as manky as s**te.
3x3" verticals at various spacings between 1-2 ft. Random noggins.Dodgey nailing and many previous repairs and extra bits of wood nailed in. Needs a bit of stiffening before it gets a new interior skin.
It now contains 50mm celotex between the beams and I aim to put another
50mm over the inside.The obvious solution would be to plate it with ply, glued (PU foaming glue) and screwed.
Then cover that with celotex, tape joints and then plasterboard.
The outside is covered with tyvek type breathable membrane and hung concrete tiles.
Could doing this lead to interstitial condensation?
The beams themselves can freely breath in and out of the tyvek.
The ply probably won't - because of both the glue and the fact that large areas of ply will be sandwiched between two layers of 50mm celotex.
Obviously not something I can really "try" and see how it goes.
Am I right that this would be a bad idea?