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The whole roof will be coming off and re boarded in OSB, Between the current finished roof height and the top of the ridge tiles is only 50mm with ridge tiles bedded directly on the GRP. I don't have the ridge height to convert to a warm roof - the roof is constructed roughly like this - The...

I'm looking at EDPM or or liquid system such as permaroof 500 all boards have to go as there is a mix of OSB and ply with some completely rotten.

Hi, I am currently renewing a large cold roof which has rotted from the inside, no ventilation or vapour barrier with a GRP top. The roof is on a dormer where the roof joists joined directly onto to the ridge beam with no ventilation and no scope to convert to warm roof due to ridge height. The...