Soundpro solution - Timber platform floor

 
E4 Schools:
Airborne:Rw 59 dB Impact: 57 L_nw dB

Test Report ref. BTC 12397A

E1 Material change of use:
Airborne: Rw 48 dB (Rw 59 - 11 C_tr)

Impact: L_nw 57 dB

Laboratory test Report ref. BTC 12397A
Airborne: Rw 48 dB D_nTw + C_tr

Impact: 58 dB L_nTw

Site test Report no. 2271

Rockwool SoundPro guidance specification

. 18mm t&g flooring grade chipboard spot bonded on
. 15mm Lafarge dBcheck wallboard on (total mass 28Kg/m²)
. 30mm min Rockwool Rockfloor resilient layer on
. 15mm OSB floor deck on
. 195 x 45mm timber joists @ 450mm ctrs
. 100mm Rockwool Flexi between joists
. Resilient bars fixed at right angles to joists @ 400mm ctrs.
. Ceiling finish, 2 layers of 15mm Lafarge dBcheck wallboard (26 Kg/m²)

Points to note:
If the existing ceiling is being replaced, the sound performance of the floor can be further enhanced by fitting resilient bars which isolate the ceiling from the floor structure.

. The floating platform floor should be isolated from the perimeter walls
. Do not bridge between the floating layer and the base floor with services and fixings that penetrate the resilient layer
. Leave min. 5 mm gap between the floating layer and skirtings. Seal gap with Rockwool Acoustic Sealant
. Ensure all ceiling perimeters are sealed with tape or Rockwool Acoustic Sealant