From the course: Construction Math Foundations

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Calculate total fall

Calculate total fall

From the course: Construction Math Foundations

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Calculate total fall

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- Sometimes, I might only see one dimension on the drawings, like this roof framing plan. Since I'm in plan view, meaning that I'm looking from the top down, I can scale the dimension from the edge of the roof to the peak of the roof and see that I have 21 feet six inches. That dimension is the run. But I don't have anything to measure to get to the rise. What I do have is a way to calculate the rise. It's shown here on the plans as the slope of the roof. And that slope is called out at four to 12, meaning that for every 12 feet of roof run I have, I'm going to have four feet of rise. If the run we measured for this roof, for example, was actually 12 feet, then the rise would be four feet. But, since we measured a run of 21.5 feet, we just need to do a little math to calculate the rise. We know that the slope is four to 12, meaning that the ratio of the rise to the run is four to 12. We can express this mathematically as a…

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