Party Wall Fire Closers are made from Semi-rigid stone wool and polythene.
The Party Wall Fire Closer should be installed in the external cavity wall with an equal overlap to either side of the party wall cavity. For 1 hour’s fire rating, the bearing on either side must be at least 75mm.
The Fire Closer should be fitted with the DPC overlap at the bottom. At the top of the Party Wall Fire Closers, the DPC should be extended to the inner leaf of the wall to form a cavity tray or sealed to the underside of the lintel.
The Party Wall Fire Closer has been designed to provide at least 1 hour’s resistance to the spread of fire past the party wall of adjoining buildings. It also significantly reduces flanking sound transmission within masonry wall cavities.
Party wall fire closures also help in achieving the building regulations and the NHBC requirements.