What is the minimum depth of hip and valley rafters?
(1) Hip and valley rafters shall be not less than 50 mm greater in depth than the common rafters and not less than 38 mm thick, actual dimension.
How do you calculate the length of a valley rafter?
The first thing to do when working out the actual length of a common rafter is determine the horizontal span of the rafter as discussed in the previous page. Each common rafter span is calculated by subtracting the thickness of the ridge from the total span, then dividing the answer by two.
What size should a hip rafter be?
The rule of thumb is that hips, purlins and ridge boards are at least 1.5 times the depth of the rafter.
How do you measure a hip and valley roof?
To measure the length of a hip roof you will need to hook your measuring tape up to the eave at the ridge rafter, run it up all the way up the ridge rafter, over the length of the entire ridge, and then back down the opposite ridge rafter down to the opposite eave.
What is the difference between a hip rafter and valley rafter?
Like the hip rafter, it extends diago- nally from the top plate to the ridge. A hip rafter is called for only when framing a hip roof, but a valley rafter is needed on both hip and gable roofs whenever roof planes intersect.
How do you install an angled hip rafter?
Measure the distance between the angled hip rafter and the top of the wall at 20 in (51 cm) increments and cut jack rafters to fit. Then use your nail gun to attach the jack rafters to the hip rafter and wall. Jack rafters run from the top of the structure’s wall to the angled hip rafter, parallel to the common rafters.
How do you measure a roof rafter run?
For a gable roof, the run is measured from the centerline of the ridge board to the outside edge of the top of the wall. Once you know the pitch and the total run, you can lay out the cuts of the rafter in a number of ways. The simplest method is to “step off” the layout in 1-ft. increments using a framing square.
What is the unit run of a hip rafter?
This shows the relative position of the hip rafter to the common rafter. The unit run of a hip rafter is the hypot- enuse of a right triangle with the shorter sides each equal to the unit run of a com- mon rafter, as shown in Figure 18-5 . The unit run of a common rafter is 12″.