I would like to run a soil pipe through a pitched roof void so i would be grateful for your advice to help me work out if i can get it done and still have have enough room for insulation. The roof void is 180mm deep and the soil pipe is 110mm in diameter. How much gap do i need to leave for ventilation between the insulation and the roof tiles? Would 10mm be enough? if so that leaves 30mm of insulation over and under the soil pipe. Does that sound like it is enough?
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