3B is an economical glass fibre underlay or intermediate layer in a built-up felt roofing system and is usually fully bonded in hot bitumen.
Glass fibre based Sand underlay
Intermediate layer in a built up roofing system
Ideal For Use Under Felt Shingles
36kg 20m rolls
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Specification Details for 3B (Liquid Applied Systems)

Please note that these product properties are not a replacement for the manufacturer's literature and it is always recommended that Rose Roofing is consulted before specifying.

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