Scenario is a single skin concrete block wall between unheated garage and heated utility room. On the warm side I've studded it, added 50mm of foil faced insulation and plan to overboard this with 67.5mm backed plasterboard.
I've been advised that I need a vapour barrier between the wall and stud, but don't know if it's breathable or a simple polythene barrier?
Can anyone advise?
I've been advised that I need a vapour barrier between the wall and stud, but don't know if it's breathable or a simple polythene barrier?
Can anyone advise?