Felt Flat Roof Construction Details

This will help you create a flat roof framing plan.

Felt flat roof construction details. Flat roofs are always built at a slight incline at least 1 8 inch per foot. The longevity of the roof depends on the quality of the materials used. From there the flat roof system you choose will determine the materials you apply. When framing a flat roof you will need to create a slight incline.

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. 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. Make sure the roof is clean dry and that all nail heads are flush with the deck. Bituminous felt is a form of waterproof sheeting that is used to cover flat roofs or as an underlay beneath slate or tile roofing.

Bitumen felt flat roofs are affordable in price and provide a great waterproofing result. Item 656632 model 0903000. 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.

Underneath the basics flat roofs are usually constructed with a ceiling nailed to joists which support a deck usually wood in residential construction a vapor barrier insulation and a roof board. For hip type shed roofs which include slopes on all 4 sides begin at the square hip at the top of the roof. In the traditional poor and roll process bitumen is supplied in blocks broken up and heated on site in a boiler until molten. Gaf shingle mate 36 in x 144 ft 400 sq ft felt roof underlayment.

Some roofs actually slope in several directions ensuring optimal water runoff. This ethylene propylene diene monomer rubber covering is very versatile long lasting and very strong. Roofing felt is essential to ensure your outbuilding is ready for all weathers by providing a waterproof cover to the building s roof. The underlying deck must be constructed of moisture tolerant materials such as 18mm wbp plywood or suitable chipboard stirling board on treated timber joists.

The flat roof covering can also be epdm. You can do this with a foam layer that exactly fits your roof. As you roll it out make sure that it remains flat.