Low Pitch Roofing Underlayment For Shingles

Despite its wide range of compatibility it still does offer a bit more whenever you re dealing with asphalt shingles.

Low pitch roofing underlayment for shingles.

Start with a 19 inch strip of 15 lb. Asphalt shingles can be used on roofs with a slope of 2 12 to 4 12 if double coverage underlayment is used. Most manufacturer and industry recommendations require or at the very least recommend special underlayment or other considerations on roofs between 2 12 and 4 12. When combined with the proper underlayment materials and application they are an excellent solution for a low slope roof with a pitch between 2 12 to 4 12.

As well a slope of 4 12 is most commonly considered the lowest slope for standard shingle installations. Asphalt saturated felt along the eaves and lap succeeding courses by 19 inches as shown in figure 2 3. The acceptable underlayment installation options for low slopes are described in the canadian standards association asphalt shingle application standard csa a123 51 as follows. The membrane will outlast the shingles and seal around all nail penetrations.

Cover the entire low sloped roof area with a self adhered modified bituminous membrane that will act as an ice and water. Product overview if you re looking for the best roof underlayment for asphalt shingles then the tyvek protec 120 should be on your wishlist. Then apply standard asphalt shingles over the membrane. Guide to roofing underlayment installation on low slope roofs with asphalt shingles.

For a low slope residential roof there are two main options.