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.

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2. It is pressure treated as well.

Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. Anything 5 and above we always at least double cripple. The tables below give maximum spans for rafters and beams. F stands for the beam s fiber strength in bending which depends on the species of wood.

Jan 15 2017 a simple buying guide for beams and rafters that support patio roofs. The house is timberframe and the perimeter beam header is rough sawn full dimension 6x14 dense doug fir. For the initial calculation f can be estimated at 1 000. Window door garage door headers supporting roof wall floor loads.

The figures are based on quality materials. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. I have a corner porch with 16 foot spans and a hip roof. In the example the beam spans the 10 foot width of the roof.

View joist rafter tables. Window door garage door headers supporting roof loads only. For a porch roof the beam needs to be. Calculating loads on headers and beams.

The total load is 4 000 pounds. Includes size and spacing tables for load bearing and links to related articles.