Porch Roof Header Span Table

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements.
Porch roof header span table. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. The house is timberframe and the perimeter beam header is rough sawn full dimension 6x14 dense doug fir. The total load is 4 000 pounds. On longer spans the beam may require much more bearing space as indicated by this table.
The figures are based on quality materials. Anything 5 and above we always at least double cripple. 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. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. The tables below give maximum spans for rafters and beams. Window door garage door headers supporting roof loads only. According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2.
For a porch roof the beam needs to be. For the initial calculation f can be estimated at 1 000. 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.
Calculating loads on headers and beams. Window door garage door headers supporting roof wall floor loads. It is pressure treated as well. Includes size and spacing tables for load bearing and links to related articles.
In the example the beam spans the 10 foot width of the roof. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.