Low Slope Metal Roof Underlayment

My roof at lowest is 75 12.

Low slope metal roof underlayment.

Determining which panel is the right choice for the slope on your project will depend on the manufacturer s minimum slope factor for that specific panel profile. At sheffield metals we also recognize low slope as 3 12 and below. Roll self adhered roofing underlayment 225 sq. Once the high temperature ice and water shield has been laid down you can now add the second underlayment layer.

Then apply standard asphalt shingles over the membrane. Gcp applied technologies grace ice and water shield 36 in. Minimum metal roof slope depends on the roof profile building design climate and site location. Low slope metal roofs require less material which reduces the overall load on the building s structure.

Ft coverage sbs modified asphalt polyester self adhered low slope roofing roll in black model lb323235. Some shingle manufacturers require ice and water shield on very low sloped decks between 2 12 and 4 12. The other side is 2 12. Asphalt shingles can be used on roofs with a slope of 2 12 to 4 12 if double coverage underlayment is used.

Structural metal panel roof systems can be used for low slope roofs because of their hydrostatic or water barrier characteristics. Ft model 5003002. A low slope roof is defined in the industry as a roof that has a pitch equal to 3 12 or less. I have found the proper roof but the underlayment options and guidance has been scattered.

The membrane will outlast the shingles and seal around all nail penetrations. Start with a 19 inch strip of 15 lb. Guide to roofing underlayment installation on low slope roofs with asphalt shingles. A metal roof mechanically seamed crimped and butyl injected at the seams designed to handle low slopes as low as 5 12.

For a low slope residential roof there are two main options. Low slope metal roofs have simple geometries and are easier and less expensive to install that medium to steep slope roofs. Also if you live in a climate such as the up in michigan and routinely get over a foot of snow standing on the roof you may want to consider it. These advantages and disadvantages do not apply to granulated synthetic underlayment as it is not to be used directly under metal roofing.

There is only one category of metal roof systems used in low slope applications structural metal panel. Asphalt saturated felt along the eaves and lap succeeding courses by 19 inches as shown in figure 2 3. In fact many synthetic underlayments are designed for specific roofing materials so be sure to check and verify beforehand. Lower slopes for low slope standing seam metal roof applications strictly peel and stick underlayment is a better choice.