How to Precisely Layout an Bastard Pitch Hip Roof Rafter using Rafter Tools+ for iPhone. How to Drop a Hip Rafter . The ridge of the hip roof intersects the slope of the main gable at the half way point. I have a hip roof that runs perpendicular to the main gable roof. So far no problem. Going beyond a CMC Placing an 8x12 Jack Rafter at exactlly 13'-5 3/4" (161.75) on a 8:12 and 10:12 bastard roof on the 10:12 side, with a hip rafter width of 3 1/2" If you want to frame a bastard hip, close enough isn't good enough. Im stick framing in the outside corners on a bastard hip trussed roof with one side a 12/12 and the other a 8/12. The offsets for an 8/10 roof would be 3” for the hip, 2-3/8” for the valley and ridge extension. Re: bastard hip roof Chas, Check the attachment, it is a cut-list and other info useful to cut your roof. Fill in the Rise/Run/Plan Angle and the Hip-Valley width fields, click, and you're all set. Knowledge. This discussion will explain how much to drop a hip rafter. That amount also corresponds to a 12” overhang. An easier way is to use my Hip-Valley Sections Calculator. PPS: Chas, there's a lengthy calculation for the shift/drop given in Post#2 of the Bastard Hip Roof thread you started. Link to Purchase the book: Buy The Book. Using the default settings in Rafter Tools+ for iPhone. Is your overhang 12”? Precise rafter layout can only be accomplished with knowledge of the geometry that develops the parallelogram in the compound joint. The correct hip lengths are 27’ 1-1/4†. Re: Bastard Hip with equal overhangs Ben, The 3-9/16” is the amount to shorten the hip and not how much to offset it to the 10 side. Scroll down to the Hip-Shift Drop fields to view the answers. 90° Eave angle. My problem is that I cant seem to get the hip rafter set to plane with both pitches. Knowledge Precise rafter layout can only be accomplished with knowledge of the geometry that develops the parallelogram in the compound joint. You can get every angle you want to the exact degrees and they will help you with everything on the roof. Bastard Hip Roof Framing Simplified to compete with the King of Bastards -- Ryan Smith Grasshopper method for canted hip rafters. From simple, to very complex, computer generated hip roof designs. The hip length shown under the “Major Pitch†column is the length of the hip with unequal overhangs. A hip roof or a hipped roof is a style of roofing that slopes downwards from all sides to the walls and hence has no vertical sides. Press the calculate button . 3 ½” for the width of the hip rafter. 8:12 main roof pitch. The top of the trusses sit 11 1/2 ” up from the top plate, so I’m using 2 x12’s for the hip … Discover 5 types of hip roofs plus 22 examples of many houses that incorporate all the different hipped roof styles. 10:12 adjacent roof pitch. A 6/12 and 9/12 Bastard Hip combo gives you 56.31° in plan view on the 6/12 side and that would be the saw setting when you cut the plumbcut for the jack rafters. To stop this the carpenters can … Let me explain..... a hip rafter rises from the corner of a building at a 45 degree angle and if the carpenters used the same HAP on that rafter as he did the commons the corner of the rafter would rise up above the plane of the roof causing a hump. The Hip’s tail is 2’ 7-3/4†. Here’s where I start to get lost. Bastard Hip Roofs Simplified to compete with the King of Bastards -- Ryan Smith Grasshopper method for devers - canted hip rafters.