Type 3b Roofing Felt

Item 656632 model 0903000.

Type 3b roofing felt. Used as an economical underlay or intermediate layer in a built up felt roofing and is usually fully bonded in hot bitumen. The product can be used as a waterproofing coating on asphalt fibre cement sheeting concrete and bituminous roofing membranes. It is also used as an underlay to bitumen shingles in a pitched roof application. A glass reinforced traditional bitumen membrane for use as an underlay.

It is recommended that an underlay such as 3b underlay is applied on roofs with a pitch between 15 degrees and 45 degrees. Although still widely cited for the specification of roofing underlays and membranes the much loved bs 747 was withdrawn in july 2007. Gaf shingle mate 36 in x 144 ft 400 sq ft felt roof underlayment. Installing the roofing felt does take care but can go very quickly.

It is sand finished on both surfaces. Guide to selection and specification 17 30357048 dc bs en 13707. Iko glass fibre underlay is a waterproofing membrane consisting of a strong glass fibre base coated with oxidised bitumen. Bs 8747 attempts to provide specific guidance for those.

It has been replaced by bs en 13707 and bs 8747. Some roofing felts are actually glued down. Reinforced bitumen sheets for roof waterproofing. This is similar to a standard roofing felt and if you are choosing to use a membrane we would recommend felt over the iko membrane.

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. Bs 8747 2007 reinforced bitumen membranes rbms for roofing. Roofing felt is comprised of a base made from natural materials such as wood cellulose or synthetic ones such as fiberglass or polyester and then coated or saturated with a protective coating such as bitumen asphalt which repels water but still allows the product to breathe. 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. Chesterfelt 3b underlay bonding felt 20mtr x 1mtr. Flexible sheets for waterproofing. The european standard bs en 13707 includes for the wide range of products found throughout the community.

We leave this up to you the customer to decide if you need an extra layer of felt or membrane under your shingles. Ikopro solvent free water proofer is an easy to use bitumen based emulsion for roofs.