Minimum Slope For Standing Seam Roof

The minimum slope for standing seam of roof systems shall be one quarter unit vertical in 12 units horizontal 2 percent slope.

Minimum slope for standing seam roof.

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. That is a 14 degree angle. 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. That means there is at least 3 of vertical rise to the roof slope for every 12 it goes back horizontally.

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 pitch for roll roofing is 2 12 or 2 inches rise to 12 inches run. The profile refers to the shape the metal sheets take when they bend to. You can often see such examples of use over metal decks.

Standing seam roof systems must have a minimum roof slope of 1 4 12 2 slope. The associa tion also stresses deflection of purlins and rafters under dead and live loads. Depending on the roof profile there are minimum roof slope requirements for each panel which need to be considered. Mechanically seamed standing seam metal roofs commonly used on large warehouses and the like can be used on much lower roof pitches.

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. This means for every 12 horizontal units the roof must rise a minimum of one half vertical unit. 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 a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run.

In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 12. In retrofit projects a sub framing system is attached to the existing flat roof surface to provide a minimum 12 roof pitch. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code.