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Posted By: mattwpriceWhat colour is the 'tarp' material? Does it appear woven? This would be your rain screen/ breathable felt, mostly likely a 'Tyvek' material which most modern roofs use now to provide breathability to allow moisture out of a building in lieu of ventilation and there-by prevent interstitial condensation. Usually this would need to have an un-vented air gap beneath it so not be in contact with the insulation in order for it to work properly of around 50mm.
Posted By: PatrickSSI would expect that when the wind blows on a cold winter night, cold air will come in the cracks and blow through the rock wool, drastically reducing the effectiveness of the insulation.
Posted By: mattwpriceBuilding Regs AD C refers to BS 5250:2002 which requires a 50mm airgap below them, although most BBA certs will allow no gap what so ever.
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