Minimum Roof Slope For Standing Seam Metal Roof

For metal roof systems.

Minimum roof slope for standing seam metal roof.

Mbma classi fies metal roof systems into two types 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 minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. Metal roof panels minimum roof slope roof pitch r905 10 2.

The minimum slope for lapped non soldered seam metal roofs without applied lap sealant shall be three units vertical in 12 units horizontal 25 percent slope. For a 1 12 pitch roof the only metal product i recommend is a mechanically seamed standing seam. You can often see such examples of use over metal decks. The minimum pitch for shingles is 1 6 which is equivalent to 4 inches rise to 24 inches run.

The minimum roof slope for metal roof panels depend on 3 different scenarios. According to the 2012 international building code 1507 4 2 deck slope minimum slopes for roof panels need to comply with the following. 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. This means for every 12 horizontal units the roof must rise a minimum of 3 vertical.

We require a 2 12 pitch for our standing seam products. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. Typically low slope metal roof systems vary in weight from 40 to 135 pounds per 100 square feet making them among the lightest roofing products and the easiest to install. 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.

In a few rare special occasions we might approve down to 1 5 12. A lightweight roofing system also places fewer demands on a building s structural support system an important consideration in earthquake prone areas. 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.