Minimum Roof Pitch For Standing Seam

Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12.

Minimum roof pitch for standing seam. Standing seam manufactures allow applications of metal coverings on slopes of 12 or even more. Minimum metal roof slope depends on the roof profile building design climate and site location. 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. The minimum slope for standing seam of roof systems shall be one quarter unit vertical in 12 units horizontal 2 percent slope.

Roof pitch multiplier table. Degrees to pitch rise in run table. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12. For this sort of system the panels are secured to the roof using hidden clips and then a seaming machine is used to crimp the seams closed so they will be water tight.

Sig zinc and copper recommend that the minimum pitch for a standing seam zinc roof is five degrees with an absolute minimum of 3 degrees. Depending on the roof profile there are minimum roof slope requirements for each panel which need to be considered. In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 12. Run in degrees and as percentage the minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

You can often see such examples of use over metal decks. A 3 degree roof pitch means just over 50mm in every metre so over 3 metres you only have 150mm to play with. The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. Modified bitumen roofing requires a minimum roof pitch of 1 4 12 or greater.

For a 1 12 pitch roof the only metal product i recommend is a mechanically seamed standing seam. Typically large footprint single story warehouses and pre engineered metal buildings will utilize low slope metal roof systems. Roof slope equivalents as rise. The profile refers to the shape the metal sheets take when they bend to.

Thermoset and thermoplastic single ply roofing requires a minimum roof pitch of 1 4 12 or greater. The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run.