Steel Shingle Roof Minimum Slope

Pitched roofs begin with with slopes greater than 3 in 12.

Steel shingle roof minimum slope.

The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. The short simple answer is 2 12 has traditionally been considered the absolute minimum acceptable roof slope suitable for asphalt shingles. Suitable materials for pitched roofs. Minimum metal roof slope depends on the roof profile building design climate and site location.

Metal roof shingles can only be installed on roof slopes of 3 12 or greater 25 slope. Asphalt shingles continue to be the most widely installed roof covering option in north america. A minimum pitch of 3 in 12 or even 4 in 12 will normally be required. 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 roofs is dependent upon the roof profile. This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units. With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels. 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.

Metal roof shingles minimum roof slope roof pitch r905 4 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. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. According to the 2012 international building code 1507 4 2 deck slope minimum slopes for roof panels need to comply with the following.

Keep in mind that neither metal shingles not corrugated metal panels are suitable options for low slope or nearly flat roofs. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. Corrugated metal roofing has the same minimum pitch.

Low slope metal roofs require less material which reduces the overall load on the building s structure. A lightweight roofing system also places fewer demands on a building s structural support system an important consideration in earthquake prone areas. The pitch is measured in inches of vertical rise per foot of horizontal run and the 5v crimp profile shown above requires a minimum slope of three in twelve or 3 12 3 inches vertically per 12 inches horizontally. Typically large footprint single story.