Roof Underlayment Requirements For Low Pitched Roof

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.

Roof underlayment requirements for low pitched roof.

It was fashionable for modern style homes built in the 1960s to have little pitch just a barely negligible slope to help drain water. Guide to roofing underlayment installation on low slope roofs with asphalt shingles. 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. I ve been told by many i need a new roof and a particular style at that.

Corrugated roofing is an amazing choice for conventional pitched roof despite having the severe limitation about the pitch. 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. Think of a classic addams family haunted house with its soaring peaks and you have a. As in all construction work paying attention to the little details can make all the difference between a long lasting trouble free project and one that results in callbacks and early failure never a good option with a new england roof.

Minimum pitch for corrugated metal roof. Visually this roof appears flat. The standard of lower pitch actually ranges between 1 12 to 5 12. The other side is 2 12.

My roof at lowest is 75 12. Starting at the eave apply 36 inch wide 914. 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.

Roofing underlayment roofing felt requirements. 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. I have found the proper roof but the underlayment options and guidance has been scattered. In either case find a professional roofing contractor experienced with low slope roofs and these specific products.

Once the high temperature ice and water shield has been laid down you can now add the second underlayment layer. Is roofing felt required. Roofs on victorian era houses were often sharply angled with a steep pitch. The majority of north american residential roofs have historically been constructed with a slope between about 4 12 and 9 12.

Anything above that will require you to put out higher cost because they are already considered as higher pitch. Start with a 19 inch strip of 15 lb. A handy roof slope estimator can help you determine if your roof slope is likely too low for shingles. In steep slope roofs 4 12 and steeper the upper courses of felt underlayment should overlap lower courses by at least 2 inches.

Roofs at the lower end of the range about 4 12 to 6 12 are relatively easy to walk and work on. This pitch might be as low as 1 12.