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#1 Low Slope (1/4:12 to 3:12) Low-slope metal roofs are often used in commercial and industrial buildings, as well as some modern residential designs. These roofs require special attention to seaming and weatherproofing to ensure proper water drainage and prevent leaks.
Metal roof slope is expressed by a ratio indicating the roof pitch, which notes the vertical rise of the roof (in inches) for every 12 inches the roof runs horizontally—in other words, dividing the vertical rise and its horizontal span. The most common slopes are: 3:12, 1/2:12 and 1/4:12.
Our chart shows the code-required minimum roof pitch for every roofing material. Minimum roof slope for asphalt shingles, metal panels, EPDM, etc.
The standard minimum slope for metal roofs is typically around 3:12 (14 degrees), but this can vary depending on the type of metal roofing and manufacturer recommendations. Some metal roofing systems can handle lower slopes, but it’s essential to follow specific guidelines. See also Can You Overlap Metal Roofing Lengthwise? A Comprehensive Guide.
Key takeaways: Proper slope ensures water drainage, preventing leaks and structural damage. Roof pitch affects water runoff, snow load, and aesthetic. Different metal roofing systems have varying minimum slope requirements. Standing seam roofs require a minimum slope of 1:12 for optimal performance.
Roof Pitch Calculator estimates roof slope from every possible angle. Calculate roof slope, area, rafters length and other dimensions. You can also convert roof pitch to Degrees (at the bottom).
Roof pitch angle and slope factor chart. For tile, shingle, slate and metal roofing. Roof Pitch is a term used in the roofing industry to describe the angle (slope) of a roofing structure. Most commonly, a roof pitch will be from 0 (flat) to 12 (45°). The pitch of a roof is determined by 2 numbers: the rise and the length.