Floating floor (a) - timber raft with resilient layer specification

Floating floor (a) should meet the following specification – timber raft of board material (with bonded edges, e.g. tongued and grooved) of minimum mass per unit area 12 kg/m2, fixed to 45 mm x 45 mm battens; timber raft to be laid loose on the resilient layer, battens should not be laid along any joints in the resilient layer; resilient layer of mineral wool with density 36 kg/m3 and minimum thickness 25 mm. The resilient layer may be paper faced on the underside.