You can either buy a pitch guage - available at most home improvement retailer or measure manually. Pitch is guaged by the rise over a 12'' run. Therefore, an 8 pitch roof rises 8'' for every foot. Therefore, if you take a level and mark it at 12'', hold one end against the roof, hold it level, and then measure the distance between the level and the roof at the 12'' mark, you will get your pitch. An inexpensive guage is definitely the way to go, but there are your options.
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Roof pitch is rise and run. So if you have a 4/12 pitch, for every foot of run the roof rises 4 inches.
In general, talking about roof pitch, I have never heard or read about this term being used. Roof pitch is measured when you start at the leading edge of a roof and measure towards the center of the house too 12 feet. Pitch is measured from a imaginary parallel level line at the 12 foot mark, how many feet high the roof is at 12 feet is the pitch of a roof. If your roof is at 4 feet high at the 12 foot mark then the phrase would be- a 4/12 pitch.
A roof angle of 6 degrees = 1.26 / 12 rise or pitch.
The angle, or pitch, of a roof is calculated by the number of inches it rises vertically for every 12 inches it extends horizontally.
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