Flat Roof How Many Layers Of Felt

This could mean flat roofs may not raise the same red flags they used to.

Flat roof how many layers of felt. Installing the roofing felt does take care but can go very quickly. 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. The sequence of laying a felt roof is. For many years it was acceptable to put even the third layer.

Apply another layer of adhesive to the top for maximum waterproofing. Steep sloped roof products such as tile slate metal and shakes only allow one layer. Lay down felt and secure to roof. Asphalt shingles typically can have one more layer added over the top two roofs total.

Add the third layer. Align this layer with the bottom of the roof. What is torch on roofing felt. These applications are ideal for flat roofs or protective surfaces under roof level decks.

You will follow the same process as in step 2 for the last layer. There are many different types of flat roofing systems available each one with their own pros and cons. Flat roofs are hard to replace. Add the second layer.

Written by larry bohan on 15 may 2018. Prepare the second layer. 2 step by step guide for felting a flat roof. Repeat until roof is covered.

1 materials for felting a flat roof. Laying the first nailed layer of underlay felt. Prepare the third layer. 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.

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. Roofing felt is one of the oldest available options and advances made in the past decade or so have begun to move more towards the torch on approach. Laying the top bonded layer of top sheet felt. Installing any gutter drips.

A third layer of felt needs to be placed. Cover the edges of the roof with strips of felt before laying out the final layer. Overlay a second layer of felt 2 to 3 inches and fasten it through the overlay so it secures the top of the felt underneath. But now flat roofs often are constructed with fewer layers because of improved waterproofing technology.

Torch on roofing or torch down roofing as it is also known is a flat roof covering solution that involves three layers of modified bitumen felt melt welded onto the roof surface and each other with the use of a blowtorch to create an impenetrable waterproof seal. On 4 12 or greater slopes the balance of the roof shall be one layer of 15 felt. This layer is not bonded to the decking so that the decking can move without damaging the felt roof. It must be installed the full length of all valleys.

You can cover the surface of the felt with gravel for added strength. On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing.