Hush Felt 25 - Acoustic Resilient Layer Joint Strip

Hush Felt 25 is an acoustic joist strip designed to reduce impact sound transmission through timber floor constructions.

It comprises a double layer of Hush Felt strip, 50 mm wide, factory stapled to 140 x 50 mm hardboard slats, each having a 25 mm gap to accommodate stapling, with 16 mm staples to joist tops. The slats present a firm, smooth surface to support the tongued and grooved short ends of the boards over the joist tops.

Chipboard, OSB or plywood tongued and grooved sheet flooring is preferred, laid across the treated joists.

Traditional wood strip flooring must be glued and screwed together on intermediate timber battens. Nailing is impracticable over a resilient layer, and it is extremely difficult to achieve a satisfactory 'squeak free' floating floor in this manner.

Alternatively, a hardwood veneer may be glued and pinned to a sheet floating layer. No nails or other fastenings penetrate the Hush Felt 25, and the floor must be permitted to float freely between walls and around door frames and pipes. A bead of water proof PVA adhesive is applied to the hardboard slats as the flooring is laid and also the tongued and grooved joints of each board (other than access panels).