Metal Roof Deck Low Slope

The more reflective a high emmissivity roof covering is to the solar spectrum the lower the average roof temp resulting in a colder average temp at the roof deck and in the attic below.

Metal roof deck low slope.

A lightweight roofing system also places fewer demands on a building s structural support system an important consideration in earthquake prone areas. 11 to strong interest in onedek the company s new roof deck system for low slope flat buildings. Lapped nonsoldered seam metal roofs without applied lap sealant must have a minimum roof slope of 3 12. 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.

It is important to note structural metal panel roof systems can be used for steep slope roof assemblies too. Available in 12 16 and 18 widths tite loc and tite loc plus panels can be produced in 22 and 24 gauge steel or 032 and 040 aluminum. Coal tar built up roofs can be installed on a roof pitch of 1 8 12 or greater. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12.

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. 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 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. Low slope metal roofs require less material which reduces the overall load on the building s structure.

Low slope metal roofs have simple geometries and are easier and less expensive to install that medium to steep slope roofs. Lapped nonsoldered seam metal roofs with applied lap sealant must have a minimum roof slope of 1 2 12. There is only one category of metal roof systems used in low slope applications structural metal panel. The panels have been designed for application over a wide variety of substrates on roof slopes as low as 1 2 12 pitch.

Minimum metal roof slope depends on the roof profile building design climate and site location. Structural metal panel roof systems can be used for low slope roofs because of their hydrostatic or water barrier characteristics. Corrugated metal roofing has the same minimum pitch. But the nightly low temp is barely affected by the daily peak temp usually limited from going colder than the dew point of the proximate air.

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