Two Layers Of Felt On Roof

Before adding the second layer though spread a thin layer of adhesive on the first layer using your trowel.

Two layers of felt on roof.

Cover the edges of the roof with strips of felt before laying out the final layer. For decades roofers have fitted a layer of felt over a roof s sheathing or roof deck before installing shingles. It didn t come with any underlay but i have worked out i could felt the roof twice with the cap sheet felt they have supplied. Though the requirement is 2 layers 15 felt in my area northern california the roofers spec 30 whether for 2 layer low slope or 1 layer normal high slope.

This will help the two layers adhere to each other. You can cover the surface of the felt with gravel for added strength. It provides structure by tying. Wind driven rain or snow can trap water under your shingles putting your roof deck and inner residence at risk of moisture.

Add the second layer. Here are the layers of a roof in order of application bottom to top. 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. In northern climates ice or snow dams are another common.

Most often made out of plywood this roof layer is installed over the framing in a typical roof install. You will follow the same process as in step 2 for the last layer. Five best practices reasons for using roofing felt underlayment. Why use roofing felt paper.

The first course starts with an extra 1 2 wide run. On 4 12 or greater slopes the balance of the roof shall be one layer of 15 felt. I have been supplied with way too much felt. Roofing felt offers an additional layer of protection against the elements.

It provides backup protection in the event of ice or water damage. So anywhere along the gable end that you can see the felt you ll see two layers. Apply another layer of adhesive to the top for maximum waterproofing. Two layers of shingles trap more heat which in turn damages the shingles and shortens the life span of the roof.

I am aware of the best practise of at least one layer of underlay nailed to the deck before a cap sheet is glued to the top with cold adhesive. The key to weatherproofing your flat roof is adding a total of 3 layers. Thus you will repeat the earlier steps.