Roof Underlayment Requirements For Low Pitched Roof

In steep slope roofs 4 12 and steeper the upper courses of felt underlayment should overlap lower courses by at least 2 inches.

Roof underlayment requirements for low pitched roof.

Asphalt shingles can be used on roofs with a slope of 2 12 to 4 12 if double coverage underlayment is used. Guide to roofing underlayment installation on low slope roofs with asphalt shingles. For roof slopes from two units vertical in 12 units horizontal 17 percent slope up to four units vertical in 12 units horizontal 33 percent slope underlayment shall be two layers applied in the following manner. Is roofing felt required.

Visually this roof appears flat. This pitch might be as low as 1 12. I have found the proper roof but the underlayment options and guidance has been scattered. The standard of lower pitch actually ranges between 1 12 to 5 12.

I ve been told by many i need a new roof and a particular style at that. Felt details for various roof slopes amp. Asphalt saturated felt along the eaves and lap succeeding courses by 19 inches as shown in figure 2 3. Start with a 19 inch strip of 15 lb.

Apply a 19 inch 483 mm strip of underlayment felt parallel to and starting at the eaves fastened sufficiently to hold in place. You can see the difference between the underlayment overlapped 19 inches on the roof to the right and overlapped 2 inches on the roof to the left. My roof at lowest is 75 12. Once the high temperature ice and water shield has been laid down you can now add the second underlayment layer.

In either case find a professional roofing contractor experienced with low slope roofs and these specific products. A handy roof slope estimator can help you determine if your roof slope is likely too low for shingles. The other side is 2 12. Roofs at the lower end of the range about 4 12 to 6 12 are relatively easy to walk and work on.

Think of a classic addams family haunted house with its soaring peaks and you have a. 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. It was fashionable for modern style homes built in the 1960s to have little pitch just a barely negligible slope to help drain water. Anything above that will require you to put out higher cost because they are already considered as higher pitch.

Minimum pitch for corrugated metal roof. This article series discusses roofing felt specifically addressing the roofing code or roofing manufacturer s requirements for use of an underlayment such as roofing felt tarpaper or other underlayment products beneath asphalt shingles and other. Corrugated roofing is an amazing choice for conventional pitched roof despite having the severe limitation about the pitch. The majority of north american residential roofs have historically been constructed with a slope between about 4 12 and 9 12.

Roofing underlayment roofing felt requirements. A metal roof mechanically seamed crimped and butyl injected at the seams designed to handle low slopes as low as 5 12.