Flat Roof How Many Layers Of Felt

Built up roofing bur was the most common type of flat roof before modified bitumen and membrane roofing were developed.

Flat roof how many layers of felt.

Finally you can save money on insulation mostly only applies to flat roof systems. You will be placing the second layer of felt over this. The durability of felt is one of its main plus points. 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.

This could mean flat roofs may not raise the same red flags they used to. It must be installed the full length of all valleys. Depending on the manufacturer the minimum guarantee you will receive is 10 years. Some roofing felts are actually glued down.

However it is commonly thought amongst roofing experts that torch on felt can last beyond 30 years in many cases. On roof slopes of 2 12 to 4 12 the remainder of the roof shall be two layers of 15 felt applied in shingle fashion or 1 layer of ice dam protection. There needs to be an overlap in the felt to help increase the water tight quality. Flat roofs are hard to replace.

But now flat roofs often are constructed with fewer layers because of improved waterproofing technology. Of course this is as long as the roof is well maintained. Paint a thin layer of adhesive over the first felt layer. By placing three even layers of felt and taking great care that there is enough overlap and that any seams don t create a straight line you can ensure that your flat roof will be optimally.

The rolls of felt are quite heavy and to avoid damage must be handled with care. 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. A bottom layer or two of insulation board multiple intermediate layers of tar or asphalt alternated with layers of roofing felt and a top layer of gravel. Not having to replace the existing insulation could be the biggest money saver.

Measure your roof and select an appropriately sized epdm membrane. The best time to lay a felt roof using cold applied adhesive is when the weather is warm but this means that working on a flat roof can be exhausting work with the sun s heat and the heat reflected from the felt already laid. Tearing off the old roofs does have many advantages as well. Laying down felt on a flat roof is an easy and effective way to improve the strength and durability of an outdoor structure like a garage or shed.

Installing the roofing felt does take care but can go very quickly. You wan walk over the roof to remove any air bubbles that may form. These applications are ideal for flat roofs or protective surfaces under roof level decks. A third layer of felt needs to be placed.

Bur consists of many layers. Use a measuring tape to measure the length and width of your flat roof.