That s because on roofs like the one in the photo with slope of 4 12 or greater only a single layer of felt is required under asphalt shingles.
One layer roofing felt.
A second layer of shingles only complicates the job when a roofer is trying to fix a leak.
This felt will help prevent damage to your roof from wind driven rain and water from other sources.
Why use roofing felt paper.
Asphalt saturated material for excellent waterproofing heavy duty felt design lays flat and minimizes wrinkling.
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.
These applications are ideal for flat roofs or protective surfaces under roof level decks.
Often there is a problem with the first layer of shingles that was not apparent.
Bitumen felt is a layer system.
One layer is bonded to the deck and then another one or two laid on that.
For decades roofers have fitted a layer of felt over a roof s sheathing or roof deck before installing shingles.
It s available in rolls that are 8m long and 1m wide with a thickness of 4 2mm mineral or 3 8mm sand.
You can t fit a dpm on the deck first and there is no advantage in it in any case.
It gets in if a joint opens or the felt is punctured.
Don t let that cowboy job put you off felt.
Adding a second layer could compromise the structure of your roof.
Roofing experts have discovered that adding a layer of protection between your structural roof decking the layer of wood that covers your rafters and your roof shingles helps create a better looking and longer lasting roof.
In fact there are a number of important ways roofing felt not only protects your roof but also your residence.
Snap a chalk line the.
Installing the roofing felt does take care but can go very quickly.
Water does not penetrate felt over time.
Roofing felt commonly called tar paper is an important component of any roofing system.
Done right it will last.
Roofing felt offers an additional layer of protection against the elements.
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.
Of course how many rolls you need will depend on the size of the roof so ensure you measure correctly.
Many roof decks were designed to handle only one layer of shingles.
Felt roof deck protection.
Align this layer with the bottom of the roof.
In a single coverage felt installation the lower edge of each course overlaps the previous course by a minimum of 2.
Anderson tecnatorch sbs torch on mineral felt capsheet is used as the final layer of the felt roofing process.
Click to enlarge any image.
