Minimum Roof Pitch For Standing Seam

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.

Minimum roof pitch for standing seam.

Typically large footprint single story warehouses and pre engineered metal buildings will utilize low slope metal roof systems. Thermoset and thermoplastic single ply roofing requires a minimum roof pitch of 1 4 12 or greater. The profile refers to the shape the metal sheets take when they bend to. 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.

In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 12. For a 1 12 pitch roof the only metal product i recommend is a mechanically seamed standing seam. 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. 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. Roof slope equivalents as rise. 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.

The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run. Degrees to pitch rise in run table. 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. The minimum slope for standing seam of roof systems shall be one quarter unit vertical in 12 units horizontal 2 percent slope.

We recommend 5 degrees however due to site conditions and execution. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12. The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. A 3 degree roof pitch means just over 50mm in every metre so over 3 metres you only have 150mm to play with.

Roof pitch multiplier table. Modified bitumen roofing requires a minimum roof pitch of 1 4 12 or greater.