Lorry, lorry polystyrene.
In article , Ian Stirling
writes
The tiles+battens+tar-paper on the roof of this house need replaced.
The boards beneath are sound.
I was considering replacing the tar-paper with 100mm polystyrene.
(with minor alterations to other stuff)
Do you lay roofing felt on top of the polystyrene as well, or just tile
straight on top?
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