The timber for the screen shall have a minimum density of 490kg/m3 with a minimum section size of 90mm by 40mm. Ash and beech are not acceptable.
The beads shall be a minimum of 37mm high by 28mm deep for Pyroshield and 20mm high for all other acceptable glasses, chamfered by 25o and fixed using 75mm long No 8s angled wood screws offset by 15mm from the opposite face screws and fixed at a maximum of 180mm centres.
The glass shall be glazed into the screen using FireGlaze 2000 intumescent strip 34mm by 5mm (uncompressed), between the glass and the beads. A FireGlaze Liner, 63mm by 2mm is required to line the apertures. Hardwood or non-combustible material setting blocks shall be used to achieve the required edge cover.
This Certificate of Approval relates to apertures of the sizes and using glasses shown in the table below when used in conjunction with FireGlaze 2000 and Liner glazing method:
