The building width, in this example, is 6 ft. Looking at our model roof, I need to find the two elements that will give me all the information needed to frame the roof. Most of the time, the two values I have are the run of a building and a specified pitch, which is why I used these values for the example in this online tutorial: If you have any two of those values, the calculator will quickly figure out the rest of the right triangle-which means it will tell you everything else you need to know about a rafter. The values on the calculator that we use for common roof framing are: Pitch, Rise, Run, and Diagonal. They essentially do the same thing as an actual construction calculator, but I prefer the real thing-if I’m going to drop a calculator in the mud, I’d rather it not be my pricey smartphone! Using a Construction Calculator There are also two laudable software versions available as smartphone apps: one from Calculated Industries, and one from BuildCalc. They put all the information in a nice, clean, easy-to-understand interface. These calculators eliminate some of the memorization, and all of the charts. Side-by-side: The Construction Master Pro (left) and the BuildCalc app on an iPhone (right) (Note: Click any image to enlarge)Ĭonstruction calculators are pre-programmed with Pythagorean formulas for finding the values of right triangles-and roofs are all about right triangles.
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