Low Pitch Roofing Underlayment For Shingles

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.

Low pitch roofing underlayment for shingles.

For starters the textured underlayment isn t just weatherproof. Cover the entire low sloped roof area with a self adhered modified bituminous membrane that will act as an ice and water. Despite its wide range of compatibility it still does offer a bit more whenever you re dealing with asphalt shingles. Asphalt saturated felt along the eaves and lap succeeding courses by 19 inches as shown in figure 2 3.

Product overview if you re looking for the best roof underlayment for asphalt shingles then the tyvek protec 120 should be on your wishlist. Asphalt shingles can be used on roofs with a slope of 2 12 to 4 12 if double coverage underlayment is used. 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.

As well a slope of 4 12 is most commonly considered the lowest slope for standard shingle installations. The acceptable underlayment installation options for low slopes are described in the canadian standards association asphalt shingle application standard csa a123 51 as follows. Guide to roofing underlayment installation on low slope roofs with asphalt shingles. The membrane will outlast the shingles and seal around all nail penetrations.

1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many equivalent products.