How Many Layers Roofing Felt

Align this layer with the bottom of the roof.

How many layers 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. 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. A third layer of felt needs to be placed. For many years it was acceptable to put even the third layer.

There needs to be an overlap in the felt to help increase the water tight quality. 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. Five best practices reasons for using roofing felt underlayment. On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing.

However in almost all areas it is not acceptable to install more than two layers of roofing on any commercial building. Paint a thin layer of adhesive over the first felt layer. Of course how many rolls you need will depend on the size of the roof so ensure you measure correctly. Anderson tecnatorch sbs torch on mineral felt capsheet is used as the final layer of the felt roofing process.

Taking the time to properly prepare the sheathing will make all the difference in how quickly and easily the felt paper is installed. 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. 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. You will be placing the second layer of felt over this.

Thus you will repeat the earlier steps. So anywhere along the gable end that you can see the felt you ll see two layers. 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.

Before adding the second layer though spread a thin layer of adhesive on the first layer using your trowel. Additionally it prevents wind driven rain from getting under your shingles and causing damage to your roof structure or the inside of your. This felt or rubberized asphalt sheet provides an extra layer of protection between your shingles and your roof deck. Snap a chalk line the.

Add the second layer. 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. It helps reduce blow off by allowing your shingles to lay flatter and more uniformly. Installing the roofing felt does take care but can go very quickly.

This will help the two layers adhere to each other.