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Hi, My new trussed rafter roof will join onto my existing purlin roof at 90 degrees i.e. on one slope. Will I need to sister/double up on every rafter or just in the areas where the reducing trusses will bear?? Any help on coach bolt diameters and spacings would help as well...

Hi, I need to lay a 65mm screed over insulation in two rooms. What sort of ratio should I be using? Is sharp sand or regular soft sand needed? Do I need to use any coarse aggregate like 10mm gravel in this? Thanks in advance, John. :)