Hi,
I am converting my flat roofed garage into a games room. It has 6m long rafters at 400mm centres with noggings halfway (at 3m). I plan to line the ceiling with plasterboard and insulate between the rafters (with a min 50mm gap between the insulaton and the flat roof), with a vapour barrier on the warm side.
The question is, do I need to provide cross ventilation in the roof space? The roof has fascia boards nailed onto the side of the rafters (no soffits etc). How do I vent the roof space? Which vents should I use? Is venting the roof space an absolute requirement if I use a vapour barrier?
Would it be better to use insulated plasterboard with an integral vapour barrier?
I am converting my flat roofed garage into a games room. It has 6m long rafters at 400mm centres with noggings halfway (at 3m). I plan to line the ceiling with plasterboard and insulate between the rafters (with a min 50mm gap between the insulaton and the flat roof), with a vapour barrier on the warm side.
The question is, do I need to provide cross ventilation in the roof space? The roof has fascia boards nailed onto the side of the rafters (no soffits etc). How do I vent the roof space? Which vents should I use? Is venting the roof space an absolute requirement if I use a vapour barrier?
Would it be better to use insulated plasterboard with an integral vapour barrier?