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I have just purchased Celotex WR4000 150mm thick and plan to put this between the rafters in a new extension, I would then like to leave a 50mm gap from the Celotex to the underside of the rafters, with Celotex PL4025 fixed to the rafters underneath. The 50mm gap will provide me with a gap for...

We have recently built a new extension which includes a new bathroom adjacent to the new outside wall. The existing bathroom is close to the new bathroom but in the middle of the house, therefore no outside wall. Obviously I will be putting extractors in both, however instead of having two vents...

Hi there, I have recently built an extension and the roof meets the existing house slightly higher than the exsiting window sill level. Therefore there are two flat roofs under each window forming inverted dormers. The tiles to the roof are double romans and I'm not sure what will be the best...