Simple Jack Rafters Length Calculation Method Used By My Grandfather - House Framing Secrets

https://www.homebuildingandrepairs.co... Visit our website today to learn more about roof framing, home building and repairs. This video will provide contractors, carpenters and do it yourselfer's with another simple roof framing formula to calculate the length of your hip jack or fill roof rafters.

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16 times 16 = 256
plus
48 times 48 = 2304
equals = 2560
square root = 50.596 or 4 foot 2 5/8 inches

50.596 divided by 4 = 12.649 for 12 inch on center spacing

50.596 divided by 3 = 16.865 for 16 inch on center spacing

50.596 divided by 2 = 25.298 for 24 inch on center spacing


12 inch on center spacing

50.596 - 12.649 = 37.947

37.947 - 12.649 = 25.298

25.298 - 12.649 = 12.649


16 inch on center spacing

50.596 - 16.865 = 33.731

33.731 - 16.865 = 16.866


24 inch on center spacing

50.596 - 25.298 = 25.298