Roof Header Span Table

Includes span tables for all load bearing locations and the number of jack studs.

Roof header span table.

Required size for a given span. Span charts and 2012 irc building codes for girders and headers. The column on the left of each chart labeled beam span represents the beam length with bearing required for your project. Determine the beam header span length and the span carried supported by the beam header.

For lesser grades spans should be shorter. Roof load width rlw and floor load width flw can be determined from as1684 or from the images below. The figures are based on quality materials. Click on the appropriate beam this will take you to the calculation table for your project.

Girder spans and header spans for exterior bearing walls maximum spans for douglas fir larch hem fir southern pine and spruce pine fir and required number of jack studs. The tables below give maximum spans for rafters and beams. 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. On longer spans the beam may require much more bearing space as indicated by this table.

A 2x12 with an e of 800 000 psi and fb of 790 psi also works since it can span 15 feet and 10 inches. Roof ceiling and one clear span floor 4 2x12 9 11 2 8 7 2 7 8 2 fccip 425 main st ste 25 greenfield ma 01301 3393 fccip staff phone. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size. Window door garage door headers supporting roof loads only.

Window door garage door headers supporting roof wall floor loads. All other data is available on page 121 of the 2012 international residential code. According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2. Anything 5 and above we always at least double cripple.

View joist rafter tables. Spacing should be interpreted as the centre to centre distance between adjacent parallel members. These charts are for 30 pound per square foot snow load on the roof. 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.

Keep in mind that these are maximums in other words shortening spans slightly will result in a more solid structure. Girders are found in floor systems spanning across piers and support the weight of floor joists.