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Pale_rider
I need to do the first fix of a flat roofed extension and am wondering what is the best way to do this, with regard to the insulation. The roof has M8 rafters and then the decking above, the resulting gaps will then be filled with solid insulation (Celotex). I need to run cables for LED Downlights and a smoke alarm. I am planning on running the cables through holes drilled centrally in the rafters, clipping them to the side of the joist and then to the underside of the roof decking in an inverted "U" fashion, then leaving the ends hanging down where the lights will be, so that the builder can drill 100mm holes in the Celotex and insert the insulation between the rafters and over the cables, coiling them up so I can drill through the plastered ceiling later. Obviously the positions will need to be accurately noted beforehand. Does anyone see anything wrong with this routing method? I can't see any other way to do it as once the insulation is in place it will be impossible to do. The lights are all LED so there is no problems regarding the de-rating of the cable as it will be covered in insulation over all it's run.
