A
Anonymous
Guest
I have bought an 1890's mews house, the upstairs of which is one big room with exposed beams and roof joists. The roof tiles are fixed to tongue & groove boards, which are fixed to the joists. The only insulation is a 15mm layer of some sort of polystyrene against the boards between the joists, with painted plasterboard on top (again between the joists) held in place by battens nailed to the sides of the joists. This leaves about 60/70mm of each joist exposed to the room, which gives quite a nice effect (the joists are 4" deep). Can anyone tell me whether there's a way of getting decent (if not perfect) insulation between the joists, still leaving them part-exposed (i.e. insulation less than 4" thick in total, including any necessary gap for ventilation) rather than filling the gaps between them entirely and platerboarding the whole ceiling? Many thanks.