What Is The Minimum Pitch For A Standing Seam Metal 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.

What is the minimum pitch for a standing seam metal roof.

The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. The pitch is measured in inches of vertical rise per foot of horizontal run and the 5v crimp profile shown above requires a minimum slope of three in twelve or 3 12 3 inches vertically per 12 inches horizontally. The minimum slope for lapped non soldered seam metal roofs with applied lap sealant shall be one half unit vertical in 12 units horizontal 4 percent slope. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

The minimum slope for lapped non soldered seam metal roofs without applied lap sealant shall be three units vertical in 12 units horizontal 25 percent slope. Standing seam roof systems must have a minimum roof slope of 1 4 12. 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. In retrofit projects a sub framing system is attached to the existing flat roof surface to provide a minimum 12 roof pitch.

A standing seam design assures adequate draining from rain and snow effectively eliminating ponding leaks and related problems typically associated with built up roofs. We recommend 5 degrees however due to site conditions and execution. The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.

Thermoset and thermoplastic single ply roofing requires a minimum roof pitch of 1 4 12 or greater. Modified bitumen roofing requires a minimum roof pitch of 1 4 12 or greater. You can often see such examples of use over metal decks. Profile in the context of metal roofing means the shape that the sheet of metal is bent into to form the panels.

A 3 degree roof pitch means just over 50mm in every metre so over 3 metres you only have 150mm to play with. Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12.