Minimum Slope For Standing Seam Roof

The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run.

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. A standing seam design assures adequate draining from rain and snow effectively eliminating ponding leaks and related problems typically associated with built up roofs. Standing seam manufactures allow applications of metal coverings on slopes of 12 or even more. Depending on the roof profile there are minimum roof slope requirements for each panel which need to be considered.

The minimum pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run. 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. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.

That is a 14 degree angle. This means for every 12 horizontal units the roof must rise a minimum of one half vertical unit. Standing seam roof systems must have a minimum roof slope of 1 4 12 2 slope. The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems.

In retrofit projects a sub framing system is attached to the existing flat roof surface to provide a minimum 12 roof pitch. That means there is at least 3 of vertical rise to the roof slope for every 12 it goes back horizontally. The minimum slope for standing seam of roof systems shall be one quarter unit vertical in 12 units horizontal 2 percent slope. 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.

Mechanically seamed standing seam metal roofs commonly used on large warehouses and the like can be used on much lower roof pitches. In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 12. Through fastener metal roof systems and standing seam metal roof systems.