BSk (British Sisalkraft) has developed a new vapour barrier, so advanced that its fire-retardant properties far outweigh anything previously available in the uk. Originally developed for housing in Alpine regions, Sisalex 580 is made to the rigorous standards demanded in other parts of Europe. Waterproof, strong and easy to form, fix and seal, it exceeds Class V fire tests. It is designed for use in buildings with a high degree of insulation, especially those with timber frames. It is also ideal where there is a risk of accidental ignition, or in corrosive environments.