Porch Roof Header Span Table

Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.

Porch roof header span table.

The house is timberframe and the perimeter beam header is rough sawn full dimension 6x14 dense doug fir. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Jan 15 2017 a simple buying guide for beams and rafters that support patio roofs. The figures are based on quality materials.

Window door garage door headers supporting roof loads only. Calculating loads on headers and beams. Includes size and spacing tables for load bearing and links to related articles. On longer spans the beam may require much more bearing space as indicated by this table.

Roof rafter span use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope. F stands for the beam s fiber strength in bending which depends on the species of wood. In the example the beam spans the 10 foot width of the roof. Tables providing size selections for various beam spans and loading combinations for southern pine dimension lumber and southern pine glued laminated timber are available for the following applications.

For the initial calculation f can be estimated at 1 000. It is pressure treated as well. The total load is 4 000 pounds. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.

Window door garage door headers supporting roof wall floor loads. For a porch roof the beam needs to be. View joist rafter tables. According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. The tables below give maximum spans for rafters and beams.