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Roof Slope and Style Guide From ImproveNet
Your guide to understanding types of roofs and potential issues with various styles.
If you've noticed water collecting on your roof, the problem is probably with the slope. As well as
determining drainage, slope also affects style. Changing the framing of the roof, changes slope. Roof
slope can dramatically affect installation and repair. In fact, the slope of a roof can determine
the kind of roofing material you use.
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There are two main categories of roofing: sloped and flat. The slope of the roof is often
referred to as the pitch as well. The roof slope, or pitch, is determined by the rise and the run of
the roof. Rise and run can be determined by the following formula: A roof with a 7/12 slope means
that for every 12 inches horizontally (Run), it rises 7 inches.
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A flat roof is considered to be a slope of 2/12 or less. Where the run always remains constant at
12 inches, (so for every 12 inches of run we can then measure the rise over that distance in inches).
A low slope roof is anywhere from 2/12 to 4/12. Conventional slope roof is 4/12, and anything more than
9/12 is considered steep. Steeper sloped roofs are considered more aesthetically pleasing and last longer
too. These benefits do not come
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Need help determining the kind of roof you have? Click here for a guide on:
Roof Type
Slope
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cheaply though. A 12/12 roof can cost up to 50% more than a 4/12 roof.
This is because a steep sloped roof requires a taller chimney and more lumber for framing. However, the
end result may be well worth it as your roofing material is estimated to last up to 50% longer and will
require less maintenance.
• Reasons for Roof Repair
• Repair vs. Re-roof
• Covering/Roofing Materials •
• Roof Slope and Style
• Roof Ventilation
• Roofing Maintenance and Tips •
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