Traditional Roofing Felt is composed of a fibre base saturated and then coated with bitumen and surfaced with either sand or a slate finish. Used in a single, two layer or three-layer application, these products are ideal for use as temporary waterproofing or for use on sheds or garden buildings. Traditional Roofing Felts are not recommended for use on habitable buildings, such as domestic extensions.

Zylex Reinforced and Zylex Aluminium Surfaced Reinforced slaters' felts are manufactured specifically for use as an underslating beneath tiles or slates in open rafter construction. Zylex Reinforced can also be used as a vapour retarder in built-up roofing.

Zylex has a felt fibre base combined with a layer of open weave hessian, saturated and coated with bitumen and surfaced with sand. Complies with BS747 Type 1F.