Published at Monday, April 15th, 2019 - 14:47:35 PM. Roof Pitch. By Angelique Alves.
The math can be tricky since the number 12 is the common numeric value used for slope denominators. Even though 12:12 can be reduced to 1:1, the number 12 is always used for roof pitch purposes. To read a roof pitch value, you would need to start with the top number (numerator) and finish with the bottom number (denominator).
Historically the word ”pitch” meant a ratio between the ridge height to the entire span/width of the building or ratio between the rafter length to the building width. And back then, the ridge was typically in the middle of the span. This is no longer the case in modern building practices.
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