Two Layers Of Felt On Roof

Thus you will repeat the earlier steps.

Two layers of felt on roof.

Why use roofing felt paper. You can cover the surface of the felt with gravel for added strength. You will follow the same process as in step 2 for the last layer. Wind driven rain or snow can trap water under your shingles putting your roof deck and inner residence at risk of moisture.

For decades roofers have fitted a layer of felt over a roof s sheathing or roof deck before installing shingles. In northern climates ice or snow dams are another common. Apply another layer of adhesive to the top for maximum waterproofing. 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.

The key to weatherproofing your flat roof is adding a total of 3 layers. This will help the two layers adhere to each other. I have been supplied with way too much felt. It provides structure by tying.

The first course starts with an extra 1 2 wide run. Add the second layer. 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. 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.

Before adding the second layer though spread a thin layer of adhesive on the first layer using your trowel. Saving on the initial shingle installation doesn t solve the long term cost of adding a second layer of shingles. Here are the layers of a roof in order of application bottom to top. If i were you i d at least follow up with that roofer on why they chose to spec 2 layers felt just for piece of mind and in case he turns out to be the better roofer or not.

It provides backup protection in the event of ice or water damage. Two layers of shingles trap more heat which in turn damages the shingles and shortens the life span of the roof. Most often made out of plywood this roof layer is installed over the framing in a typical roof install. Assuming your roofing contractor is using standard 36 wide 15 roofing felt double coverage means that each layer of felt put down across the roof laps 19 over the upper half of the previous course.

Cover the edges of the roof with strips of felt before laying out the final layer. Roofing felt offers an additional layer of protection against the elements. Five best practices reasons for using roofing felt underlayment.