How Many Layers Roofing Felt

Taking the time to properly prepare the sheathing will make all the difference in how quickly and easily the felt paper is installed.

How many layers roofing felt.

Align this layer with the bottom of the roof. On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing. This felt or rubberized asphalt sheet provides an extra layer of protection between your shingles and your roof deck. You wan walk over the roof to remove any air bubbles that may form.

This will help the two layers adhere to each other. For many years it was acceptable to put even the third layer. However in almost all areas it is not acceptable to install more than two layers of roofing on any commercial building. A third layer of felt needs to be placed.

The key to weatherproofing your flat roof is adding a total of 3 layers. So anywhere along the gable end that you can see the felt you ll see two layers. 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. 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.

Snap a chalk line the. There needs to be an overlap in the felt to help increase the water tight quality. You will be placing the second layer of felt over this. Before adding the second layer though spread a thin layer of adhesive on the first layer using your trowel.

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. On 4 12 or greater slopes the balance of the roof shall be one layer of 15 felt. It s available in rolls that are 8m long and 1m wide with a thickness of 4 2mm mineral or 3 8mm sand. Of course how many rolls you need will depend on the size of the roof so ensure you measure correctly.

Installing the roofing felt does take care but can go very quickly. It helps reduce blow off by allowing your shingles to lay flatter and more uniformly. Additionally it prevents wind driven rain from getting under your shingles and causing damage to your roof structure or the inside of your. Paint a thin layer of adhesive over the first felt layer.

The first course starts with an extra 1 2 wide run. Add the second layer. Anderson tecnatorch sbs torch on mineral felt capsheet is used as the final layer of the felt roofing process. Five best practices reasons for using roofing felt underlayment.

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.