How To Frame Hip Roofs 4
 


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Adjustment Of The Hip Rafter

The hip rafter is shortened by removing one half the diagonal thickness of the common rafter at 90 degrees to the plumb line.When locating the plumb line, remember that the run of the hip is 45 degrees to the building.

One half the diagonal thickness of the common rafter is number 7, shown in plan view in figure 4. The hip centreline is at an angle of 45 degrees to the ridge and end common. This allows number 8 in figure 4, to represent two equal sides of a right triangle and number 7 to be the hypotenuse. Number 8 = 1/2 FCR and 1/2 ECR. If the common rafter stock is 38 mm thick then the length of number 8 = 19 mm. The square root of 19^2 + 19^2 = 26.87 mm rounded to 27 mm. 27 mm is the length of number 7 and is one half the diagonal thickness of the common rafter at 90 degrees to the plumb line.

The upper end of the hip rafter is shortened by 27 mm measured at 90 degrees to the hip rafter working point plumb line. Mark a plumb line at the new location and extend it squared across the top of the rafter. See number 7 on figure 5.

                                                                 

 




                                             
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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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