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.

That will help you remember certain factors and details to build the best possible flat roof. Roofing felt is essential to ensure your outbuilding is ready for all weathers by providing a waterproof cover to the building s roof. 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. 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.

In the traditional poor and roll process bitumen is supplied in blocks broken up and heated on site in a boiler until molten. Light weight shed roofing felt is not suitable for flat roof construction. Item 656632 model 0903000. So any timber joists that are used need to be strong enough to support this weight.

Flat roofs are hard to replace. Gaf shingle mate 36 in x 144 ft 400 sq ft felt roof underlayment. As you may imagine there is a fair amount of weight involved here in terms of boards felt etc. Sizes of joists needed for flat roof construction.

Old asbestos roofs are often replaced with flat roofs. Bituminous felt is a form of waterproof sheeting that is used to cover flat roofs or as an underlay beneath slate or tile roofing. Follow the 10 steps below in order to felt a flat roof. 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. This could mean flat roofs may not raise the same red flags they used to. Some roofing felts are actually glued down. Insulation for the warm flat roof only the basic construction process.

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. Installing the roofing felt does take care but can go very quickly. The longevity of the roof depends on the quality of the materials used. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology.

Bitumen felt flat roofs are affordable in price and provide a great waterproofing result. In terms of materials please note that there are several different weights for the roofing felt. 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.