Message - Rafter Angle Calculation

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Posted by  Luke Smith on December 15, 2002 at 20:34:03:

I have come across a statement in my architectural design text that I do not understand. Under Elevation Projecton /Roof-Line Projection

"After the pitch is established a slope diagram must be drawn on the elevation as shown in fig.... Double the run and it will become the span. This is a constant 24. Place the rise over the span (24) and reduce if necessary. This fraction is used by the carpenter to determine the rafter angle in degrees."

I don't have any trouble figuring the rafter angle from the pitch, but don't have a clue as to why the carpenter needs the span fraction.

If anyone can explain why the carpenter needs this fraction and what he does with it, please let me know. Meanwhile I hope none of my high school students ask me this question.

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