Safe Spans For No 1 Roof Rafters

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.

Safe spans for no 1 roof rafters. 1 ft 0 3048 m. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. The 1 grade material is more expensive than the 2 grade but if you can use fewer or smaller 1 grade joists or rafters in your design you may actually save money. Span calculator for wood joists and rafters also available for the android os.

Contact a building control officerfor advice. The maximum spans in the table above are for the horizontal distance the rafter can span not the diagonal distance or actual length of the rafter. Live load is weight of furniture wind snow and more. Span calculator for wood joists and rafters available for the iphone.

Rafter table type 1. This type is used to determine the length of the common valley hip and jack rafters and the angles at which they. Let s use this example and find a size of rafter that will work. Dead load weight of structure and fixed loads 15 lbs ft 2.

Given in the table. Type 1 figure 7 10 appears on the face of the blade. For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine. Maximum floor joist span no.

2 are indicated below. For example 2 by 6 rafters made from select structural grade douglas fir that are required to support a live load of 20 pounds per square inch can have a maximum horizontal span of 11 feet 4 inches. Maximum clear span of rafters in metres for roof pitches of between 15 and 45 degrees roof pitch between 15 and 22 5 degrees with rafter spacing. Douglas fir maximum horizontal roof rafter span for lumber grade selected structural and no.

The tables below give maximum spans for rafters and beams. 2 grade of douglas fir and maximum span floor joists imperial units nails and spikes withdrawal force allowable withdrawal load for nail and spikes softwood and hardwood structural strength classes strength classes bending stress and mean density of hardwood and softwood. The other type of table gives the actual length of a rafter for a given pitch and span. Decreasing the distance between rafters to 12 inches however increases the maximum span to 14 feet 4 inches.