Low Pitch Roofing Underlayment For Shingles

Product overview if you re looking for the best roof underlayment for asphalt shingles then the tyvek protec 120 should be on your wishlist.

Low pitch roofing underlayment for shingles.

Asphalt shingles can be used on roofs with a slope of 2 12 to 4 12 if double coverage underlayment is used. For starters the textured underlayment isn t just weatherproof. As well a slope of 4 12 is most commonly considered the lowest slope for standard shingle installations. Despite its wide range of compatibility it still does offer a bit more whenever you re dealing with asphalt shingles.

For a low slope residential roof there are two main options. 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. 1 cover the entire surface with a self adhesive flashing membrane such as grace ice water shield there are many equivalent products.

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. Asphalt saturated felt along the eaves and lap succeeding courses by 19 inches as shown in figure 2 3. 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. Guide to roofing underlayment installation on low slope roofs with asphalt shingles.

Then apply standard asphalt shingles over the membrane.