Iko Glass Fibre Underlay (Formally Type 3B) 20 x 1m
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A waterproofing membrane, manufactured to BS 747 Type 3B, consisting of a strong glass fibre base coated with oxidised bitumen.
- This product is used as an economical underlay (or intermediate layer) in a built-up felt roofing specification, and is usually fully bonded in hot bitumen
- It is also used as an underlay to bitumen shingles in a pitched roof application
- Straightforward installation using standard hot bitumen bonding
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