Standing Seam Roofing Minimum Slope

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.

Standing seam roofing minimum slope. 2 exactly does not translate to 1 4 per foot. The profile refers to the shape the metal sheets take when they bend to form panels. 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. And profiles like standing seam which utilize a concealed connection to the roof deck require only a one and a half inch minimum pitch.

The associa tion also stresses deflection of purlins and rafters under dead and live loads be checked to ensure positive drainage. The minimum slope for standing seam of roof systems shall be one quarter unit vertical in 12 units horizontal 2 percent slope. 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 roof is in 12 applicable only to coal tar pitch roof systems.

So typically we follow 2 slope is that meeting the code even if the slope is slight shy of 1 4 per foot. You can often see such examples of use over metal decks. I understand this is more of rounding off to get to a nice number. Standing seam roof systems must have a minimum roof slope of 1 4 12 2 slope.

Standing seam is the metal roof profile that has been gaining more popularity nowadays due to its clean and modern looks. This means for every 12 horizontal units the roof must rise a minimum of one quarter vertical unit. Manufacturers specify a minimum pitch for each of the profiles they offer and sometimes they can be installed at a lower pitch if special underlayment or installation procedures are followed. 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.

I am looking at the ibc minimum roof slope requirement for standing seam metal roof. Ibc callouts for min 2 or 1 4 per foot. Depending on the roof profile there are minimum roof slope requirements for each panel which need to be considered.