Minimum Roof Pitch For Standing Seam

Degrees to pitch rise in run table.

Minimum roof pitch for standing seam.

Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12. Roof pitch multiplier table. In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 12. The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run.

Typically large footprint single story warehouses and pre engineered metal buildings will utilize low slope metal roof systems. 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. 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. A 3 degree roof pitch means just over 50mm in every metre so over 3 metres you only have 150mm to play with.

The profile refers to the shape the metal sheets take when they bend to. Roof slope equivalents as rise. Speaking about standing seam metal roof slope it is a general and a self evident knowledge that the steeper it is the faster it is for snow rain or drain to come down the roof. Minimum metal roof slope depends on the roof profile building design climate and site location.

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. We recommend 5 degrees however due to site conditions and execution. Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12.

Standing seam roof systems must have a minimum roof slope of 1 4 12. 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. 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. Thermoset and thermoplastic single ply roofing requires a minimum roof pitch of 1 4 12 or greater.

The minimum slope for standing seam of roof systems shall be one quarter unit vertical in 12 units horizontal 2 percent slope. Depending on the roof profile there are minimum roof slope requirements for each panel which need to be considered.