Minimum Slope 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.

Minimum slope for standing seam roof.

Mbma recommends a minimum slope of 1 2 in 12 2 4 degrees for through fastener metal roof systems and 1 4 in 12 1 2 de grees for standing seam metal roof systems. Mechanically seamed standing seam metal roofs commonly used on large warehouses and the like can be used on much lower roof pitches. Standing seam roof systems must have a minimum roof slope of 1 4 12 2 slope. Depending on the roof profile there are minimum roof slope requirements for each panel which need to be considered.

You can often see such examples of use over metal decks. The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. Standing seam manufactures allow applications of metal coverings on slopes of 12 or even more. Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12 4 slope.

The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run. The associa tion also stresses deflection of purlins and rafters under dead and live loads. A standing seam design assures adequate draining from rain and snow effectively eliminating ponding leaks and related problems typically associated with built up roofs. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.

That means there is at least 3 of vertical rise to the roof slope for every 12 it goes back horizontally. In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 12. The minimum slope for standing seam of roof systems shall be one quarter unit vertical in 12 units horizontal 2 percent slope. Through fastener metal roof systems and standing seam metal roof systems.

The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. This means for every 12 horizontal units the roof must rise a minimum of one half vertical unit. In retrofit projects a sub framing system is attached to the existing flat roof surface to provide a minimum 12 roof pitch.