Low Pitch Roofing Underlayment For Shingles

For starters the textured underlayment isn t just weatherproof.

Low pitch roofing underlayment for shingles.

Start with a 19 inch strip of 15 lb. Because of the non absorbent nature of asphalt the shingles themselves provide an element of waterproofing which is why they work well for low slopes. Product overview if you re looking for the best roof underlayment for asphalt shingles then the tyvek protec 120 should be on your wishlist. 1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many equivalent products.

Cover the entire low sloped roof area with a self adhered modified bituminous membrane that will act as an ice and water. 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. The membrane will outlast the shingles and seal around all nail penetrations. For a low slope residential roof there are two main options.

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. Then apply standard asphalt shingles over the membrane. The acceptable underlayment installation options for low slopes are described in the canadian standards association asphalt shingle application standard csa a123 51 as follows. Asphalt saturated felt along the eaves and lap succeeding courses by 19 inches as shown in figure 2 3.

Asphalt shingles can be used on roofs with a slope of 2 12 to 4 12 if double coverage underlayment is used.