Minimum Roof Pitch For Flat Roof

Normally 1 80 0 72 is the recommended minimum angle for a slope and this is universal across the vast majority of flat roofing systems regardless of the materials that they incorporate.

Minimum roof pitch for flat roof.

To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope. The minimum roof slope for metal roofs is dependent upon the roof profile. Depending on the roof profile there are minimum roof slope requirements for each panel which need to be considered. However you can only use this pitch with built up roofing or specialized synthetic roofing.

Wood shakes require a minimum roof pitch of 3 12 or greater. The following table provides the minimum required allowable roof slope for each type of roofing material mentioned in the code. According to the international building code the typical built up flat roof that uses tar or asphalt goes by the guideline that for every foot 12 inches of a flat roof a minimum of inch must step up or down. In order to achieve this drop a slightly steeper angle of 1 40 1 44 should be the aim when installing a flat roof as this accounts for surface.

Mineral surfaced roll roofing requires a minimum roof pitch of 1 12 or greater. To calculate roof pitch take the lowest point of the roof and measure the amount of rise for every 12 inches of horizontal movement toward the highest point. Built up roofs require a minimum roof pitch of 1 4 12 or greater. The profile refers to the shape the metal sheets take when they bend to.

The minimum roof slope allowed by code for any type of roof is in 12 applicable only to coal tar pitch roof systems. A low pitched roof is easier to put up and maintain but may show very little of its material at ground level. Minimum pitch for metal roof. The minimum slope for standing seam of roof systems shall be one quarter unit vertical in 12 units horizontal 2 percent slope.

For example a roof that rises 3 inches for every 12 inches has a pitch of 3 12. The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run. With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels. Typically large footprint single story warehouses and pre engineered metal buildings will utilize low slope metal roof systems.

Wood shingles require a minimum roof pitch of 3 12 or greater. Low slope roofs are not totally flat their roof slope generally ranges from 1 4 12 to 3 12. They provide excellent weather resistance great value and now more than ever a tremendous range of beautiful designs and color blends. Minimum metal roof slope depends on the roof profile building design climate and site location.

Slate and slate type shingles require a minimum roof pitch of 4 12 or greater.