we have had bad condensation in our bathroom. made worse by the council knobs removing the fan.
we've installed a new fan and I'm making progress taking of the spot of flaky artex.
I have discovered 2 holes.
1 was from a previous shower installation. not very big, but was filled with tissue then filler on top.
the other is a mystery, but they used cardboard and poorly patched it. it's in the corner close to the pipe hole, a triangle about 2-3 inches each side.
I'm able to push the card board through to the attic.
what is the best way to fix it?