Semi-rigid Rockwool stone wool to polythene damp proof course cavity closers for the junctions at party walls.
Designed to provide at least one hour resistance to the spread of fire past the party wall of adjoining buildings. It also significantly reduces flanking sound transmission within masonry wall cavities.
Fire performance to BS 476-20:
One hour (provided the bearing width of the closer on each side of the cavity wall is at least 100 mm), assessed by Warrington Fire Reach Centre.
Surface spread of flame to BS 476-7:
Class 1 rated.
Can be used to prevent the passage of flanking sound within masonry cavities and complies with Building Regulations (E&W) Approved Document E 2003 and the requirements of Robust Details.
Ozone depletion potential of zero. No CFCs or HCFCs used in manufacture.
Party Wall Fire Closers