Porch Roof Header Span Table

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.

Porch roof header span table.

F stands for the beam s fiber strength in bending which depends on the species of wood. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. 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. 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. Calculating loads on headers and beams. Includes size and spacing tables for load bearing and links to related articles. For the initial calculation f can be estimated at 1 000.

I have a corner porch with 16 foot spans and a hip roof. The total load is 4 000 pounds. Anything 5 and above we always at least double cripple. The house is timberframe and the perimeter beam header is rough sawn full dimension 6x14 dense doug fir.

In the example the beam spans the 10 foot width of the roof. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. Window door garage door headers supporting roof loads only. 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 tables below give maximum spans for rafters and beams. It is pressure treated as well. The figures are based on quality materials. Window door garage door headers supporting roof wall floor loads.

For a porch roof the beam needs to be. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.