How Many Layers Roofing Felt

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.

How many layers roofing felt.

Add the second layer. However in almost all areas it is not acceptable to install more than two layers of roofing on any commercial building. Snap a chalk line the. The key to weatherproofing your flat roof is adding a total of 3 layers.

It helps reduce blow off by allowing your shingles to lay flatter and more uniformly. Five best practices reasons for using roofing felt underlayment. The first course starts with an extra 1 2 wide run. 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.

Paint a thin layer of adhesive over the first felt layer. Thus you will repeat the earlier steps. On most flat roofs such as epdm tpo or modified it is perfectly acceptable to two layers of roofing. For many years it was acceptable to put even the third layer.

Installing the roofing felt does take care but can go very quickly. Anderson tecnatorch sbs torch on mineral felt capsheet is used as the final layer of the felt roofing process. You will be placing the second layer of felt over this. 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 s available in rolls that are 8m long and 1m wide with a thickness of 4 2mm mineral or 3 8mm sand. 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. You wan walk over the roof to remove any air bubbles that may form. This will help the two layers adhere to each other.

Align this layer with the bottom of the roof. Taking the time to properly prepare the sheathing will make all the difference in how quickly and easily the felt paper is installed. There needs to be an overlap in the felt to help increase the water tight quality. 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. This felt or rubberized asphalt sheet provides an extra layer of protection between your shingles and your roof deck. A third layer of felt needs to be placed. On 4 12 or greater slopes the balance of the roof shall be one layer of 15 felt.

Of course how many rolls you need will depend on the size of the roof so ensure you measure correctly.