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Calculating Roof Quantities
Course 3

About the course

This lesson discusses the Pythagorean Theorem and how it can be used to calculate rafter length. The Pythagorean Theorem allows you to find the third side of a right triangle when the other two sides are known. In estimating, this is most commonly used to find the length of the rafter when the rise and run are known. In this case, the rafter is the hypotenuse of the triangle and the rise and run are the legs. This can be helpful to determine the length of a rafter from measurements that can be obtained from the ground. Understanding the Pythagorean Theorem is an essential skill for all types of construction pros.

Course 3: Calculating Roof Quantities

  • Chapter 1: Pythagorean Theorem 3:41 (4.7 MB)
  • Chapter 2: Other Construction Calculations 5:31 (8.7 MB)

Related Courses

Course 2: Calculating Quantities