Cavity Fire Seal
Sealmaster Cavity Fire Seal is suitable for use in cavities from 20 – 50mm wide, in all timber framed constructions. it may be used in a horizontal or vertical plane, i.e. at floor level or around window apertures. It is mounted directly to the inner cavity wall or on a splayed, treated softwood batten, if necessary, to provide a clear gap of 10mm between the seal and cavity outer wall. This batten may be continuous or interrupted by vertical battens, as needed.
The batten should be fixed through to the structure with 75mm galvanised nails at 250mm centres, staggered top to bottom, the seal is then fixed directly to the batten with 30mm galvanized nails, staggered at 150mm centres. Care should be taken to ensure that joints in the batten and cavity fire seal and / or fixings do not coincide. The Sealmaster Cavity Fire Seal does not require any intumescent mastic to joint or to bed against, nor does it require any paint or other protective coatings.