3 Layer Felt Roof

Giving the benefit of longer lasting resistance to uv rays this method of laying flat roofs has a lot of advantages and is sure to be a fine choice for your dormer extension or anywhere else you have a flat roof.

3 layer felt roof. For a complete replacement including new decking boards with a 3 layer system 1200 00. For a 3 layer felt only system required over habitable and insulated areas of the house 850 00 inc vat. It is then applied to a fibrous membrane which is typically made of fibreglass polyester or hessian. Typically it s applied as a 3 layer system usually consisting of a perforated underlay a 2mm underlay layer then thick 4 5mm felt.

The second layer is another layer of underlay felt but this one is bonded by adhesive to the first nailed layer. We haven t included the cost for replacement guttering fascias or soffits. The common substance used in this system is made from bitumen. This type of felt roof comes on rolls and is laid with the aid of a very large blow torch that heats and melts the rear of the felt melting it onto the roof structure below.

A three layer torch down roof features the same base and cap sheets as well as an additional cap sheet with a granulated surface. Three layer felt systems have come a long way from the early days. It is essential that the joins do not coincide with those of the first layer. They are no longer laid with hot bitumen and have stone chippings put on top.

Anderson toptorch sbs sb2 torch on underlay is a solid option with rolls that cover 16m length 1m width and have a thickness of 1 5mm available for a manageable outlay. They had a stereotypical belief they were only good enough for your shed or garage. The torch on felt solution relies on a three layer system which will require two levels of underlay underneath the cap sheet. The products used today are a 3 layer membrane system applied with the use of a gas gun.

Two layer torch down roofing may cost less to install but it doesn t last as long and doesn t offer as many benefits. This can be avoided by starting the second layer with a half width roll or if necessary a full width sheet can be cut down to suit after it has been cut to length. Offering an upgrade on the old fashioned bitumen and stone chip system of felt roofing the 3 layer felt roof system has changed the way these roofs are laid. Roofing felt offers one of the original options and modern advances have led to the creation of the 3 layer felt system.

What is a 3 layer felt roof system. Add 50 for firrings if needed.