Felt Flat Roof Construction Details

When framing a flat roof you will need to create a slight incline.

Felt flat roof construction details.

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. This will help you create a flat roof framing plan. Gaf shingle mate 36 in x 144 ft 400 sq ft felt roof underlayment. Bituminous felt is a form of waterproof sheeting that is used to cover flat roofs or as an underlay beneath slate or tile roofing.

For hip type shed roofs which include slopes on all 4 sides begin at the square hip at the top of the roof. Light weight shed roofing felt is not suitable for flat roof construction. Afterward roll the felt away from you lengthwise along the lower edge about 10 feet 120 in. The longevity of the roof depends on the quality of the materials used.

Ideal for an apex flat or pent roof shed felt and roofing membrane are durable and perfect for a newly built structure or to re cover existing roofing material. This flat roof covering can be roofing felt usually 3 layers with a mineral chipping topping to soak up the heat of the sun which protects the felt from both melting and breakdown under uv rays. As you roll it out make sure that it remains flat. Make sure the roof is clean dry and that all nail heads are flush with the deck.

Roofing felt is essential to ensure your outbuilding is ready for all weathers by providing a waterproof cover to the building s roof. This ethylene propylene diene monomer rubber covering is very versatile long lasting and very strong. Flat roofs are always built at a slight incline at least 1 8 inch per foot. The flat roof covering can also be epdm.

Bitumen felt flat roofs are affordable in price and provide a great waterproofing result. In the traditional poor and roll process bitumen is supplied in blocks broken up and heated on site in a boiler until molten. The substance itself is made from bitumen which comes from the distillation of crude oil that has been either mixed with sand or crushed limestone. The underlying deck must be constructed of moisture tolerant materials such as 18mm wbp plywood or suitable chipboard stirling board on treated timber joists.

Some roofs actually slope in several directions ensuring optimal water runoff. You can do this with a foam layer that exactly fits your roof. Begin at the bottom right or bottom left of the roof.