IKO Glass Fibre Underlay is a waterproofing membrane, manufactured to BS 747 Type 3B, consisting of a strong glass fibre base coated with oxidised bitumen. It is sand finished on both surfaces.
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.
- Glass Fibre Based Underlay.
- Ideal For Use Under Felt Shingles.
- Roll weight: 36kg.
Formerly BS747 Type 3B.