By The steel construction Institute
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Additional info for Acoustic Detailing for Multi-Storey Residential Buildings
For additional performance, a 19 mm gypsum-based board may be included under the flooring board (optional). Services installed in floor should not bridge the resilient layer. Separate flanking strips should be used to isolate the walls from the floating floor system. Floor treatment must be installed in accordance with the manufacturer’s instructions. 2 Cradle and batten floor 18 mm (min) thick tongue and groove flooring board 60 mm min. Floor slab (In-situ concrete slab on profiled steel decking or pre-cast units) Proprietary battens on proprietary cradles on resilient pads Notes This floating floor treatment is a Robust Detail floor treatment (FFT 2) when used with 18 mm (minimum) tongue and groove flooring board and a resilient cradle and batten system at least 60 mm deep.
2. See Section 4 for floor and ceiling treatment options. Floor materials Precast unit mass should be at least 300 kg/m2. Screed mass should be at least 80 kg/m2. Precast units must butt tightly together and all voids between units must be grouted. Ceiling board should not be in direct contact with any steel beams or columns. Floor treatment should not be continuous under separating wall. Wall materials Concrete block density should be 1350 – 1600 kg/m3 or 1850 – 2300 kg/m3. Voids between the wall and floor must be filled with acoustic or flexible sealant.
No services should be installed in the floor system. Floor treatment must be installed in accordance with the manufacturer’s instructions. 2 Ceiling treatment details All separating floors should have a ceiling treatment of at least one layer of nominal 8 kg/m2 of gypsum-based board. Ceiling treatments to precast unit separating floors may require 10 kg/m2 of gypsum-based board depending on the size of the void between ceiling and precast unit (see details below for further guidance). The sound insulation performance of a ceiling treatment can be increased by placing a mineral wool quilt in the ceiling void (performance improved typically by 3 - 4 dB for airborne and 4 - 5 dB for impact sound) or by using two layers of gypsum-based board (performance improved typically by 2 - 4 dB for airborne and 3 - 5 dB for impact sound).
Acoustic Detailing for Multi-Storey Residential Buildings by The steel construction Institute