Minimum Roof Pitch For Metal Building

The required roof slope varies with application of materials and use.

Minimum roof pitch for metal building.

Minimum pitch for metal roof. Lapped nonsoldered seam metal roofs without applied lap sealant must have a minimum roof slope of 3 12 25 slope. The minimum roof slope for metal roof panels depend on 3 different scenarios. The minimum pitch for metal roof shingles and lapped non soldered panels is 3 12.

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 slope for lapped non soldered seam metal roofs without applied lap sealant shall be three units vertical in 12 units horizontal 25 percent slope. Typically large footprint single story warehouses and pre engineered metal buildings will utilize low slope metal roof systems. Minimum metal roof slope depends on the roof profile building design climate and site location.

Profiles with a higher ridge at the panel connections can be installed lower. The minimum roof slope for metal roofs is dependent upon the roof profile. The slope of a steel building s roof is expressed by a ratio called roof pitch which indicates the number of inches a roof rises vertically for every 12 inches it runs horizontally. With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels.

To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. The minimum roof slope requirement for metal panels varies depending on panel connection conditions. Panels joined with an applied lap sealant can go as low as 12.

Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12. This means for every 12 horizontal units the roof must rise a minimum of 3 vertical. A lightweight roofing system also places fewer demands on a building s structural support system an important consideration in earthquake prone areas. 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.

Also pitch is often expressed in a shorthand style using just the first number. See the below florida building code fifth edition 2014 2017 sections below to determine which slope is appropriate based on your specific design scenario. There are advantages and disadvantages to consider with both higher and lower roof pitches. Pbr which is typically used for industrial metal buildings can be installed as low as half inch pitch for example.

Metal roof panels minimum roof slope roof pitch r905 10 2. Corrugated metal roofing has the same minimum pitch.