Hi can anyone please advise me size, material and design of Beams/ rafter /joist for following slanting roof with high load because of sand filling. We are doing for a sound proof room.
Measurement : Length 6.6 M Width 3,6 M Height 3 M at one end and 2,6 meter at another end
Roofing layers 1) Bitumen or fibreglass waterproof membrane. 2) Marine ply or OSB 12-15mm 3) 50x100mm or greater timbers as builder decides is needed for the span. 4) 25x25mm battens 5) 12mm OSB 6) 50mm approx kiln dried sand 7) 25-50mm RW3 or RW 45 rockwool (60KG/M2) 8) 15mm plasterboard 9) 12mm OSB
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