Both steep- and low- slope roofs come with different benefits and considerations. Buildings with a steeper slope often shed snow, rain and debris shed more efficiently because of their angled sides. This can make your roof last longer with fewer roof leaks. However, the angle can allow wind to get underneath the attached roofing material, causing wind-related roof problems. Further, this slope also means it can be more difficult for roofers to work on your roof as opposed to lower-slope options, making things like roof maintenance slightly more challenging.
So what exactly defines a low-or steep- slope roof? Slope in the roofing industry uses that same "rise over run" idea that you learned in school. Rise refers to the vertical height of the roof from the lowest edge of the roof to the highest point, known as the ridge. Run refers to the measurement from the outside of the eave to the point below the center of the ridge. These two measurements are expressed as inches per foot and is written in a ratio format, producing the slope of a roof.
In the roofing industry anything that has a slope of 3:12 or below is considered low-slope. This means that for every 12 horizontal inches (run), the roof has a rise of three or less vertical inches. The slope of a roof is expressed as inches per foot and is written in a ratio format. It is important to note that, while low-slope roofs may look flat to the naked eye and we often use that term colloquially, technically no roof is fully flat, there will always be a slight slope!
Alternatively, anything that has a slope of 3:12 or above is considered steep-slope. Steep-slope roofs are generally used in residential roofing as they shed water efficiently and there are many roofing materials that can be used on them to achieve your desired look.

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