The tables below give maximum spans for rafters and beams.
Porch roof header span table.
Jan 15 2017 a simple buying guide for beams and rafters that support patio roofs.
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.
View joist rafter tables.
The house is timberframe and the perimeter beam header is rough sawn full dimension 6x14 dense doug fir.
Window door garage door headers supporting roof wall floor loads.
I have a corner porch with 16 foot spans and a hip roof.
Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
Window door garage door headers supporting roof loads only.
The figures are based on quality materials.
F stands for the beam s fiber strength in bending which depends on the species of wood.
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.
The total load is 4 000 pounds.
Calculating loads on headers and beams.
On longer spans the beam may require much more bearing space as indicated by this table.
Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
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.
Anything 5 and above we always at least double cripple.
Includes size and spacing tables for load bearing and links to related articles.
According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2.