Roof Hip Spans

Visit the roof framing page for more information on cutting roof rafters and visit the roof pitch calculator for determining rafter lengths based on rise and run.

Roof hip spans.

Span calculator for wood joists and rafters also available for the android os. They must must be on the same level. 1 ft 0 3048 m. 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.

Live load is weight of furniture wind snow and more. The 1 grade. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.

The lengths and sizes of joists vary depending on the species and quality of the lumber used. Dead load weight of structure and fixed loads 15 lbs ft 2. Hip roofs are more stable than gable roofs and more resistant to strong winds and hurricane. Hip girder truss a pitch truss with a truncated or flat apex so that it can support more load.

So this table could accommodate a house with a total rafter span or house width of 32 feet. Spacing should be interpreted as the centre to centre distance between adjacent parallel members. The spans in this table are based on a maximum supported rafter span of 16 feet where the supported span is the total horizontal distance spanned by the roof rafters divided in half not the diagonal distance or the length of the rafter. 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.

Span for the main rafters measure from outside of wall to outside of wall. 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. Also available for the android os. Wood beam calculator american wood council website rafter and joist span faq.

Select the following information by using the drop downs to enter values in feet and inches. 2 are indicated below. Roof load width rlw and floor load width flw can be determined from as1684 or from the images below.