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There appear to be two guidelines when insulating between the rafter space on a pitched slate roof. One guideline says to leave a 50mm gap to the top of the rafter the other guideline says fill to the top of the rafter. Which is right?

Prior to having my electrics checked out I have been told that I need to put an earthing bond on my metal bath, towel rail, lights and pipework. Can you tell me in simple terms, the size of conduit to order 1.5mm2 2.5mm2 4.0mm2 Leaning towards the 4.0 is this correct?

Hi there! New to the forum and have the following query. :cry: Do Grade B Samaca slates curl up like a piece of dry bread the longer they are left on the roof as they seem to be getting worse week by week.