Low Slope Roof Underlayment For Standing Seam Roof

There are some opinions that standing seam metal roof minimum slope is 12 but it increases the possibility of leaking on the few first days of snow arrival.

Low slope roof underlayment for standing seam roof.

Low slope metal roofs require less material which reduces the overall load on the building s structure. These advantages and disadvantages do not apply to granulated synthetic underlayment as it is not to be used directly under metal roofing. Start with a 19 inch strip of 15 lb. Peel and stick is only needed for low slope or if your roof has a issues with ice dams 4a doesn t sound like a climate for that.

Clay or cement tiles can be used on a wide range of roof pitches. Low slope metal roofs have simple geometries and are easier and less expensive to install that medium to steep slope roofs. Their fasteners are either concealed or screwed at the top of a ridge which makes them less likely to leak. For pitches of 2 5 12 up to 4 12 the roof requires double underlayment.

Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12. Underlayment is important for a metal roof you get night time condensation on the underside of the panels you don t want that to get into your deck. I don t see any point in sealing the roof penetrations to the sheathing. In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 12.

But the taller profiles like standing seam and pbr shown below can be installed on roofs with as low as 1 4 or 1 2 in 12 pitch. Guide to roofing underlayment installation on low slope roofs with asphalt shingles asphalt shingles can be used on roofs with a slope of 2 12 to 4 12 if double coverage underlayment is used. 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. On low slope roofs like you have a water proof membrane like i ws is good insurance.

Slopes above 19 12 are not recommended since tiles on very steep roofs can rattle. Metal panel roof system description there is only one category of metal roof systems used in low slope applications structural metal panel. 4 12 to 20 12 pitches. Asphalt saturated felt along the eaves and lap succeeding courses by 19 inches as shown in figure 2 3.

Once the high temperature ice and water shield has been laid down you can now add the second underlayment layer.