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• British Standard glass fibre based products
• Applied single-ply in certain systems

Typical specification

Maxi-Torch 3B is a waterproofing membrane, consisting of a glass fibre base coated with oxidised bitumen. It is sand finished on both surfaces. It is used as an economical underlay (or intermediate layer) in a built-up felt roofing specification, and usually fully bonded in hot bitumen. This product is also used as an underlay to bitumen shingles in a pitched roof application.


Glass fibre based membranes should be installed in accordance with BS 8217: 2005, Code of practice for reinforced bitumen membranes for roofing. Glass fibre based roofing membranes are applied by traditional our and roll methods. Hot bitumen is poured in front of the roofing felt roll, which is then unrolled into the bitumen, spreading t to give a continuous coating for the full width. The membranes are applied with minimum 75mm side and end laps.

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