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...Installation guidelines rockfloor acoustic tools required figure separating timber floor upgrade material change of use ade section insulation saw tape measure floors approved document e describes a range constructions that should achieve the standards if built correctly service runs can be accommodated by recessing and minimum thickness mm is to this t g flooring osb on ceiling upgraded grade chipboard joists kg m flexi rated between plasterboard resilient layer airborne dnt w ctr db or more impact l nt less floating layers board are provide total mass spot bonded together with joints staggered eg plank loose laid over rockwool existing deck used consists lath plaster it retained providing satisfies part b fire safety in doubt underdraw an additional firecheck before screwing into pre completion site testing note being replaced sound performance further enhanced fitting bars which isolate from structure adopting method test report no showed construction exceeded requirements rw dntw l...