ONSTRUCTION TYPE: Hardrock Multi-Fix (DD) Weighted Sound Reduction Index Metal Deck Weight sound reduction index Sound Reduction Index (SRI) Rw Laboratory Test 35 dB Rw Test Report Number Number of layers of 5 kg Acoustic Membrane Nil 1.5mm PVC membrane mechanically fixed ROCKWOOLHardrock® Multi-Fix (DD) .22mm polyethylene vapour control layer 0 Varying layers of ROCKWOOL Acoustic Membrane (quantities are shown) .7mm galvanised steel profile deck 0 Main image: Typical application of ROCKWOOL HARDROCK® (DD) and ROCKWOOL Acoustic Membrane
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