Porch Roof Header Span Table

The house is timberframe and the perimeter beam header is rough sawn full dimension 6x14 dense doug fir.

Porch roof header span table.

Window door garage door headers supporting roof wall floor loads. In the example the beam spans the 10 foot width of the roof. 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. View joist rafter tables.

F stands for the beam s fiber strength in bending which depends on the species of wood. The figures are based on quality materials. Jan 15 2017 a simple buying guide for beams and rafters that support patio roofs. Window door garage door headers supporting roof loads only.

On longer spans the beam may require much more bearing space as indicated by this table. Calculating loads on headers and beams. The tables below give maximum spans for rafters and beams. For the initial calculation f can be estimated at 1 000.

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. Includes size and spacing tables for load bearing and links to related articles. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.

I have a corner porch with 16 foot spans and a hip roof. It is pressure treated as well. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. Anything 5 and above we always at least double cripple.

Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. 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.