Minimum metal roof slope depends on the roof profile building design climate and site location.
Low slope roofing metal.
At sheffield metals we also recognize low slope as 3 12 and below.
Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12.
There is only one category of metal roof systems used in low slope applications structural metal panel.
The post and purlin system adds a continuous base zee which enables it to be installed over steel bar joists that are spanning perpendicular to the new roof slope.
In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 12.
Low slope metal panel roofing may be a standing seam roof ssr through fastened roof tfr or insulated metal panel imp roof.
A low slope roof is defined in the industry as a roof that has a pitch equal to 3 12 or less.
An ssr has side joints between the roof panels that are arranged in a vertical position above the roof line.
Low slope metal roofs require less material which reduces the overall load on the building s structure.
Structural metal panel roof systems can be used for low slope roofs because of their hydrostatic or water barrier characteristics.
The metal roof retrofit system is installed over steel bar joists that are spanning parallel to the new roof slope.
A lightweight roofing system also places fewer demands on a building s structural support system an important consideration in earthquake prone areas.
Low slope metal roofing materials include perimeter edge flashing soffit panels drainage and es 1 rated edge systems from sheet metal supply.
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.
Determining which panel is the right choice for the slope on your project will depend on the manufacturer s minimum slope factor for that specific panel profile.
But the taller profiles like standing seam and pbr shown below can be installed on roofs with as low as 1 4 or 1 2 in 12 pitch.
Typically large footprint single story warehouses and pre engineered metal buildings will utilize low slope metal roof systems.