Low Slope Metal Roof Detail

Minimum metal roof slope depends on the roof profile building design climate and site location.

Low slope metal roof detail.

Low slope metal roofs have simple geometries and are easier and less expensive to install that medium to steep slope roofs. That includes soldered metal roofing or synthetic membranes. If the ssr is attached directly to open framing it is typically designed to expand and contract and must be allowed to float. Because of the shallow height of the undulating ridges of the 5v and corrugated profiles and the use of exposed metal fasteners to screw the metal to the roof deck they are limited to a slope that will shed rain quickly.

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. The panels have been designed for application over a wide variety of substrates on roof slopes as low as 1 2 12 pitch. 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. The roof clips or hold down clips are concealed in the seam of the panel.

Regular asphalt shingles and standard skylights will work at pitches of 4 12 or greater but at lower pitches you have to use different materials. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12. The prevalent rib geometries for low slope metal panel roofs include the trapezoidal or vertical rib profile. A lightweight roofing system also places fewer demands on a building s structural support system an important consideration in earthquake prone areas.