Felt Flat Roof Construction Details

The underlying deck must be constructed of moisture tolerant materials such as 18mm wbp plywood or suitable chipboard stirling board on treated timber joists.

Felt flat roof construction details. Roofing felt is essential to ensure your outbuilding is ready for all weathers by providing a waterproof cover to the building s roof. 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. Installing the roofing felt does take care but can go very quickly. Some roofing felts are actually glued down.

Light weight shed roofing felt is not suitable for flat roof construction. So any timber joists that are used need to be strong enough to support this weight. Bitumen felt flat roofs are affordable in price and provide a great waterproofing result. To build a flat roof you ll want to have a thorough understanding of how the process of constructing the flat roof works and the different methods available.

Item 656632 model 0903000. This could mean flat roofs may not raise the same red flags they used to. Sizes of joists needed for flat roof construction. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology.

These thick layers of roofing felt are installed by heating the back of the felt with a butane torch and then carefully applying it to the roof. Gaf shingle mate 36 in x 144 ft 400 sq ft felt roof underlayment. Some observers suggest it s harder to replace a flat roof than a traditional pitched shingle roof because of the labor required to remove its layers especially on older flat roofs. That will help you remember certain factors and details to build the best possible flat roof.

Flat roofs are hard to replace. As you may imagine there is a fair amount of weight involved here in terms of boards felt etc. The longevity of the roof depends on the quality of the materials used. Old asbestos roofs are often replaced with flat roofs.

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. Insulation for the warm flat roof only the basic construction process. Bituminous felt is a form of waterproof sheeting that is used to cover flat roofs or as an underlay beneath slate or tile roofing. Step by step guide for felting a flat roof.

Follow the 10 steps below in order to felt a flat roof. Make sure the roof is clean dry and that all nail heads are flush with the deck. This guide will use the more durable 30 roofing felt although you can use 15 felt.