One Layer Roofing Felt

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.

One layer roofing felt.

You can t fit a dpm on the deck first and there is no advantage in it in any case. Bitumen felt is a layer system. While roofing felt isn t the cheapest it s one of the most effective systems. These applications are ideal for flat roofs or protective surfaces under roof level decks.

The prices are certainly within most people s budget. Some roofers install a layer of waterproof shingle underlayment wsu over the existing shingles at the eave end as would be done for a roof laid on bare sheathing. Let s say a shingle or a tile should break in a storm. Some roofing felts are actually glued down.

Water does not penetrate felt over time. Most building codes allow this but is it a good idea. 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. Windows on the roof photo by brent darby ipc images.

It provides extra weather protection although your shingles are your roof s first line of defense against the elements having a backup layer of weather protection underneath helps extend the life of your roof deck. Roofing felt underlayment layers. Felt done properly should last more than 10 and up to 25 years in the right place. One layer is bonded to the deck and then another one or two laid on that.

However roofing felt offers additional protection against leakage providing an extra layer of water resistance. Installing the roofing felt does take care but can go very quickly. If the roof has a layer of felt paper over it it has got some protection that will resist the driving rain at least for a little while. We explain when double coverage of felt underlayment is recommended and we describe how to figure out if your roofer installed a single layer or double coverage layer or maybe no layer of felt under the roof shingles.

For decades roofers have fitted a layer of felt over a roof s sheathing or roof deck before installing shingles. The average re roofing job will cost about 600 less than a tear off job. But you need a different weight of felt depending on the type of roofing product you re using. Roofs that feature insulation on the outside of the structure will require a vapour control layer to prevent the rise of condensation.

This provides added protection against ice dams. 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. Double layer or double coverage roofing underlayment are defined here.