The Glass Fibre Underlay is a durable, waterproof roofing membrane with an oxidised bitumen coating on a sturdy glass fibre base. Ideal for built-up felt roofing and underlay for bitumen shingles, it offers an economical solution with a dual sand-finished surface. Compliant with BS 747: 2000 Type 3 standards, these underlays are usually applied using hot or cold bitumen adhesive.
Product Description
This Glass Fibre Underlay is a robust waterproofing membrane that boasts an oxidised bitumen coating on a resilient glass fibre base. It offers a dual sand-finished surface and is primarily employed as an affordable underlay in built-up felt roofing, typically bonded fully in hot bitumen. Furthermore, it often finds use as an underlay for bitumen shingles in a pitched roof scenario. Such glass fibre roofing membranes generally comprise underlays and cap sheets, in line with former BS 747: 2000 Type 3 standards. Besides, they frequently feature an oxidised bitumen coating and either a sand or mineral surface. These underlays are typically applied using either hot bonding bitumen or cold bitumen adhesive.
