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thank you tony.building control visit today so see where i stand.

hi i am currently slowly building a 6060 x 4000 extension, brick @ block and would appreciate any help and advice. could any one help calculate the roof load.specified as - 50x170 C24 @ 400 centres 12mm ply on firrings to falls 115mm celotex 6mm external ply 3 layers felt...