Minimum Slope Of Standing Seam Roof

Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12 4 slope.

Minimum slope of standing seam roof.

Lapped nonsoldered seam metal roofs without applied lap sealant must have a minimum roof slope of 3 12 25 slope. 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. 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. Standing seam manufactures allow applications of metal coverings on slopes of 12 or even more.

The minimum roof slope allowed by code for any type of roofis in 12 applicable only to coal tar pitch roof systems. That means there is at least 3 of vertical rise to the roof slope for every 12 it goes back horizontally. Minimum roof slope roof pitch r905 10 2 1. That is a 14 degree angle.

The following tableprovides the minimum required allowable roof slope for each type of roofing material mentioned in the code. 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 pitch for roll roofing is 2 12 or 2 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.

The minimum slope for standing seam of roof systems shall be one quarter unit vertical in 12 units horizontal 2 percent slope. The minimum pitch for a standing seam metal roof is 1 4 or 3 inches rise to 12 inches run. You can often see such examples of use over metal decks.