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Celotex between rafters, polstyrene over. Vapour barrier ?
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The Natural Philosopher
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Celotex between rafters, polstyrene over. Vapour barrier ?
Ian Stirling wrote:
wrote:
Hi,
Im in the process of insulating the roof of my garage.
I am planning on using 50mm Celotex between the rafters. Due to cost,
I was planning on using 25mm polysterene from B&Q over.
Would I still need the vapour barrier plasterboard ? Or if I ditch the
polysterene could I just tape up the joints where the Celotex meets the
rafters and use standard plasterboard ?
Take sheet of non-vapour barrier plasterboard.
Dilute PVA to milk-like consistency.
Arrange some way to prop up the sheet so that it's off the floor,
vertical, or sloping slghtly backwards, with the long side parallel to
the floor.
Spray a meter with the PVA solution from a small pump-up sprayer.
Lay two lines of kitchen foil, slightly overlapping.
Spray another meter, repeat.
This gets you a foil coated bit of plasterboard for well under 30p, and
in under 5 min or so.
Whereas the extra cost of the foil backed plasterboard is probably about
10p for the same area..
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