Steel Roofing Minimum Slope

Most metal roofs will have minimum pitches of three in twelve but this might sometimes go down depending on whether there are special installation procedures issued by the manufacturer regarding that particular roofing material.

Steel roofing minimum slope.

Minimum metal roof slope depends on the roof profile building design climate and site location. On a steep slope roof greater than 2 12 and for climate zone 8 the cool roof requirements are an aged solar reflectance of 0 15 and a thermal emittance of 0 75. The minimum roof slope for metal roof panels depend on 3 different scenarios. The following table provides the minimum required.

This means for every 12 horizontal units the roof must rise a minimum of 3 vertical units. That is your cool roof specification for your roofing product. According to the 2012 international building code 1507 4 2 deck slope minimum slopes for roof panels need to comply with the following. Metal roofing shall resist a minimum wind uplift resistance as determined by chapter 16 high velocity hurricane zones for a roof slope of 9 5 degrees 0 0166 rad and a roof mean height of 15.

Run in degrees and as percentage the minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. 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. Lapped nonsoldered seam metal roofs without applied lap sealant must have a minimum roof slope of 3 12 25 slope. Corrugated metal roofing has the same minimum pitch.

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. Roof slope equivalents as rise. In our example we are using tile roofing with a weight greater than 5 lb sq. Moreover low slope metal roofs are not prone to the degradation experienced by organic materials enabling these roofs to better resist the elements.

In country with heavy snow and tough winter days the metal roof minimum slope is recommended to be 1 12. To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. Typically large footprint single story warehouses and pre engineered metal buildings will utilize low slope metal roof systems.