Minimum Slope For Standing Seam Roof

Standing seam roof systems must have a minimum roof slope of 1 4 12 2 slope.

Minimum slope for standing seam roof.

Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12 4 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 profile refers to the shape the metal sheets take when they bend to. That means there is at least 3 of vertical rise to the roof slope for every 12 it goes back horizontally.

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 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. In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 12.

The associa tion also stresses deflection of purlins and rafters under dead and live loads. This means for every 12 horizontal units the roof must rise a minimum of one half vertical unit. Standing seam manufactures allow applications of metal coverings on slopes of 12 or even more. That is a 14 degree angle.

The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. In retrofit projects a sub framing system is attached to the existing flat roof surface to provide a minimum 12 roof pitch. You can often see such examples of use over metal decks. Depending on the roof profile there are minimum roof slope requirements for each panel which need to be considered.

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. 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. Mechanically seamed standing seam metal roofs commonly used on large warehouses and the like can be used on much lower roof pitches.