How To Frame Hip Roofs 8
 


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Dropping The Hip

The seat cut of the birdsmouth is raised so that the top edge of  the hip, where the hip intersects the building line, matches the top edge of the common rafters. The raising of the seat cut is called dropping the hip. Figure 8 shows the layout for dropping the hip. Mark the height of the commons along the first plumb line extending from working point 2. The height of the commons is the distance from the top edge of the common rafter to the peak of the birdsmouth. Draw a second plumb line where the wall plate intercepts the side of the hip. The distance between the plumb lines will be 1/2 of the hip rafter thickness measured at 90 degrees to the plumb line. Mark the height of the commons along the second plumb line. Draw a seat cut line at the bottom edge of the new height of the commons line. Extend it to the first plumb line and the edge of the hip rafter. If the hip rafter at the building corner is not going to be exposed, cut out the birdsmouth as shown by the cutting lines in figure 8,


                                                                






                                               
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Framing Hip Roofs Links

                                                     1.Framing Hip Roofs: Hip Roof Frame Components.
                                                     2.Framing Hip Roofs: Calculate The Hip Rafter & Overhang Line Lengths.
                                                     3.Framing Hip Roofs: Layout The Common, End Common, and Hip Rafters.
                                                     4.Framing Hip Roofs: Calculate The Adjustment Of The Hip Rafter.
                                                     5.Framing Hip Roofs: Measure The Hip Rafter Double Cheek Cut.
                                                     6.Framing Hip Roofs: Measure The Birdsmouth For A Hip Rafter.
                                                     7.Framing Hip Roofs: Align The Hip Rafter By Bevelling Or Dropping The Hip.
                                                     8.Framing Hip Roofs: Raise The Seat Cut By Dropping The Hip.
                                                     9.Framing Hip Roofs: Layout & Cut The Birdsmouth For An Exposed Hip Rafter.
                                                     10.Framing Hip Roofs: Calculate The Hip Rafter Overhang & Tail Cut.
                                                     11.Framing Hip Roofs: Calculate The Hip Jack Rafter Line Length.







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Ronald Hunter
           
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