Ever wonder why a ‘Hip’ cut is different from a ‘Common’ cut? The difference for example between say, a 6&12 common rafter cut and a 6&17 hip cut on the same roof? Here’s a simple and practical way to understand the differences between the cuts. Look/click on the picture. Note the scale. (Office paper is not large enough to go full scale) The diagram shows a 12 inch by 12 inch box. (You can draw this on your garage floor just to burn it into your mind) The 17 inches comes from measuring diagonally from corner to corner. The hip rafter rises slower than a common. Where the common rafter rises 6 inches vertically in one foot horizontally, the hip rafter rises 6 inches vertically in 17 inches horizontally. Kinda makes you want to build a full hip roof for Fido’s doggy house, Huh. Just another tasty tidbit of knowledge brought to you by The Owner Builder.