Porch Roof Header Span Table

The numbers in gray indicate the distance between the support posts.

Porch roof header span table.

All other data is available on page 121 of the 2012 international residential code. For a porch roof the beam needs to be sized according to the maximum snow loads in your area and you must know enough about the porch design to determine how the load will be distributed and over what distance the beam will carry the load. A double 2x12 beam can span 12 feet. Dimensional lumber deck beam span chart.

Window door garage door headers supporting roof wall floor loads. According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2. On longer spans the beam may require much more bearing space as indicated by this table. In the example the beam spans the 10 foot width of the roof.

View joist rafter tables. In areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot. 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. Window door garage door headers supporting roof loads only.

Beams of more than one ply must be fastened together with either nails or bolts. The tables below give maximum spans for rafters and beams. Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters. 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.

The total load is 4 000 pounds. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. 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.

Includes span tables for all load bearing locations and the number of jack studs. A 2 2x10 can span 10 feet and so on. For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. The figures are based on quality materials.