Low Slope Roofing Underlayment

Gcp applied technologies grace ice and water shield 36 in.

Low slope roofing underlayment.

And this synthetic roof underlayment becomes famous due to its quality easy installation process and affordability. Ft coverage sbs modified asphalt polyester self adhered low slope roofing roll in black model lb323235 59 98 59 98. This will provide a double layer of underlayment across the entire roof. It is mainly used for garages and sheds that have a.

On low slope roofs like you have a water proof membrane like i ws is good insurance. Ft model 5003002 149 00 roll 149 00. Roll self adhered roofing underlayment 225 sq. Asphalt shingles can be used on roofs with a slope of 2 12 to 4 12 if double coverage underlayment is used.

If the roof slope is below 3 12 pitch see our previous post on how to determine a roof s pitch the entire roof should be covered but only if the roof is conventionally vented cold roof construction. I don t see any point in sealing the roof penetrations to the sheathing. Then apply standard asphalt shingles over the membrane. 1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many equivalent products.

It has just one layer so it goes on fast and can be installed by a homeowner with basic diy experience and tools. Roll roofing is different. Water that gets below both the roofing and underlayment will cause the same amount of problems whether it permeates the plywood or follows the pipe down. Set your store.

Asphalt saturated felt along the eaves and lap succeeding courses by 19 inches as shown in figure 2 3. Also if you live in a climate such as the up in michigan and routinely get over a foot of snow standing on the roof you may want to consider it. It provides long lasting protection for the low slope areas of your property. Liberty sbs self adhering base ply sheet is a self adhering roofing membrane designed for use with liberty sbs self adhering cap sheet.

The underlayment can make it through the summer heat winter snow and spring rain on a low slope roof without anything covering it. Guide to roofing underlayment installation on low slope roofs with asphalt shingles. In low slope roofs which include 2 12 up to 4 12 felt courses should overlap a minimum of 19 inches. Once the high temperature ice and water shield has been laid down you can now add the second underlayment layer.

Some shingle manufacturers require ice and water shield on very low sloped decks between 2 12 and 4 12. While this is an extremely rare necessity it is sometime called for. For a low slope residential roof there are two main options.