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  1. Blob the Builder
    I'm trying to decide on my roof make up. If i go with tradition and have sarking boards on my rafters, covered with a membrane and slates nailed directly through, then what ventilation should i provide? My rafters are 245mm depth (i have 1 and 1/2 storey room in roof) so i have scope with insulation. My original specification involved fibre cement slates, battens and counterbattens, ventilated above membrane, on OSB. Below OSB a 50mm vent gap, then 190 mm of PIR between rafters, 25 mm PIR internally across rafters, then plasterboard. But now i'm thinking of natural slate. Do i need ventilation gap beneath sarking boards? I've read some details which say i can full fill between rafters, which could open the way for Frametherm roll or equivalent, and internal PIR across rafters, possibly 50mm. And do i need ventilation above fascia and in ridge?
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