Anyone have experience with sound proofing requirements for attic conversions? I've been specified double layers of 15mm soundbloc which is fair enough although one of the walls is already double Victorian brick with a 20cm cavity between and the spec requires a 50mm void to a stud with 100mm rockwool insulation followed by 2 layers of 15mm soundbloc then 67.5 mm kingspan insulated plasterboard. If the bloke on the other side of my attic decides to convert his the total wall thickness will approach 1m! This is an issue for me as I have to carry over 100 sheets (each weighing 44kg) up to the third floor!
50mm Rockwool bat in a 75mm softwood timber stud faced with plaster board was enough to satisfy my building regs ; that was for the internal walls around the New staircase. The party wall was a thermal upgrade requirement, I fixed 62.5mm insulated plasterboard to the party wall up the stairwell core. This was approved.
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