LantacParty Wall & Fire Closers
AIM semi-rigid mineral wool to polyethylene DPC Cavity Closers
The mineral wool is non-combustible in accordance with BS476 part 4 (1970). The DPC conforms to BS6515 (1984).
The Cavity Closer conforms with the 1994 Building Regulations and the National House Building Council Requirements.
The AIM Party Wall Fire Closer has been designed to provide at least 1 hour resistance to the spread of fire past the party wall of adjoining buildings. Where a separating wall meets the cavity wall, Building Regulations require the use of a mineral wool closer for sound insulation purposes. The AIM Party Wall Fire Closer will also meet this requirement significantly reducing flanking transmission through masonry wall cavities.
Fixing Details
The AIM Party Wall Fire Closer should be installed in the external cavity wall with an equal overlap to either side of the separating wall cavity. The bearing on either side must be at least 75mm for 1 hour fire ratings or 100mm for 2 hour fire ratings.
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.
Fire Resistance
The performance of the AIM fire protection range has been tested to BS 476 part 20 and assessed by Warrington Fire Research Centre. The AIM Party Wall Fire Closer will provide a fire rating of 1 hour, provided that the bearing width of the closer on each side of the party wall is at least 75mm; 2 hours if the bearing width is 100mm. The minimum bearing widths may be reduced for small gaps. AIM mineral wool products are incombustible to BS 476 part 4, rated Class 1 Surface Spread of Flame to BS 476 part 7 and comply with the performance requirements of Class O of the Building Regulations (does not apply to the DPC).
