Roof Header Span Table

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

Roof header span table.

Roof load width rlw and floor load width flw can be determined from as1684 or from the images below. Span charts and 2012 irc building codes for girders and headers. Required size for a given span. Window door garage door headers supporting roof wall floor loads.

The tables below give maximum spans for rafters and beams. These charts are for 30 pound per square foot snow load on the roof. Click on the appropriate beam this will take you to the calculation table for your project. 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. Keep in mind that these are maximums in other words shortening spans slightly will result in a more solid structure. Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12. Window door garage door headers supporting roof loads only.

For lesser grades spans should be shorter. According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2. 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. Determine the beam header span length and the span carried supported by the beam header.

On longer spans the beam may require much more bearing space as indicated by this table. Spacing should be interpreted as the centre to centre distance between adjacent parallel members. The column on the left of each chart labeled beam span represents the beam length with bearing required for your project. All other data is available on page 121 of the 2012 international residential code.

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. 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. The figures are based on quality materials.

View joist rafter tables. As the table shows no 2x8 s meet the span and spacing requirements but a 2x10 with an e of 1 300 000 psi and fb of 1093 psi can span 15 feet 3 inches more than enough.