Hip Roof Rafter Spacing

If your project had a rafter length of 8 or less a safe and strong method is to use 2x8 framed 16 on center.

Hip roof rafter spacing.

Porch roof extensions for hip roof porch extensions from an existing building wall you can use half the calculator results. Select the following information by using the drop downs to enter values in feet and inches. See saw miter and blade angle settings. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.

These are called hip jack rafters. Minus ridge thickness to allow for ridge becoming pole plate roof peak will be slightly higher ridge thick must be same. Typical rafter spacing codes will specify a minimum spacing of 16 inches 19 2 inches or 24 inches. As a general rule roofs that have a high human occupancy rate should be framed with rafters every 16 structures such as sheds or barns can be frames with rafters every 24 again make sure to consult local codes.

If using a circular saw or compound miter saw set saw bevel angle to 45 to obtain creeper and hip side angles. The spacing between rafters in a given building is part of the engineering calculations that determine the required structure of the roof. Other relevant factors include the type of wood being used for the rafters the size of the rafters and the load that the rafters need to support. If your local building authority has a rafter spacing code you may not space rafters wider than required by code.

Hip jack rafters are the shorter rafters that connect to the hip rafters. 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. Rafters must be strong enough to hold the roof sheathing and the shingles. Enter the extension wall length into wall length and double the extension wall width then minus ridge thickness into the wall width entries.

The hip end jacks tab displays a dimensioned side view and top view of the hip roof jack rafters for the hip end side of the hip rafter on an irregular hip roof. Since the hips connect diagonally to the ridge board the rafters close the edges of walls on either side of the hip rafters will be shorter. Hip roof framing rafter cut angle template diagram. With the saw bevel angle set to 45 cutting hips and creepers at the plumb cut angle will produce correct side angles.

Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. Rafter span tables use these tables to determine lengths sizes and spacing of rafters based on a variety of factors such as species load grade spacing and pitch.