Type A and B External Walls, Fire Resisting Constructions Type A and B External Walls, Fire Resisting ConstructionsReflective Sarking / Wall Wrap and Vapour Permeable wall wrap for use in Non-combustible Constructions. Ametalin CeaseFire® FireSark® Micro-perforated VapourTech® RWC Roof Wall Commercial SilverSark® VapourTech® Wall FireSark®