Hip Roof Jack Rafters

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Hip roof jack rafters.

When you create a hip roof in a timber frame there are different types of rafters used. Rick arnold frequent contributor to fine homebuilding and the journal of light construction presenter at jlc live the katz roadshow the remodeling show. The hip roof framing calculator returns the value of the main rafter the side rafter the length of the hip the height of the knee wall and the lengths of the jack rafters. Dab digital smart ear defender.

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. Select the following information by using the drop downs to enter values in feet and inches. A jack rafter is a shortened com mon rafter that may be framed to a hip rafter a valley rafter or both. At the birdsmouth i supplied the 3 inch seat and for the rafter tail a 12 inch overhang with a 2 inch high subfascia plumb cut which dictated the level cut at the heel.

The first step is to enter the length of the longest jack rafter. The jack rafters in turquoise connect from the plate in red to the hip rafter and are of different lengths depending on where on the slope they are placed. Know that the basic skeleton for the roof has to be erected before any jack rafters can be installed. Depending on the size of the roof most hip roofs will have 4 6 short jack rafters that are spaced out every 20 inches 51 cm between the hip rafters and the king common rafters.

Thus there are hip jack rafters and valley jack rafters. The hip rafters in purple form the roofline and extend from the plate to the ridge. They must must be on the same level. The 7 12 pitch hip roof is framed with 2x6 common and jack rafters on 16 inch centers and with 2x8 hips and ridge.

The total rise of hip and valley rafters is. 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. If more are needed then simply start over by entering the last measurement in the longest jack rafter field.