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silly question but which way up should my breathable felt go? the label says coloured side up, it has a black slightly shinier side and a white holey side. it makes sense to me that the shinier side is more water resistant, whereas the porous looking side lets the moisture through. i was...

hi i am converting a single skin (3 sides) coal shed with pre cast concrete flat roof into a bath/shower room. what is the best way to insulate the walls, floor and ceiling to insure no damp, etc. i figured for the walls making a 100m stud inside, filling with 100mm celotex, etc...