The tables below give maximum spans for rafters and beams.
Roof header span table.
Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.
Determine the beam header span length and the span carried supported by the beam header.
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 column on the left of each chart labeled beam span represents the beam length with bearing required for your project.
Required size for a given span.
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 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.
Span charts and 2012 irc building codes for girders and headers.
These charts are for 30 pound per square foot snow load on the roof.
Anything 5 and above we always at least double cripple.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
On longer spans the beam may require much more bearing space as indicated by this table.
Window door garage door headers supporting roof wall floor loads.
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.
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.
Spacing should be interpreted as the centre to centre distance between adjacent parallel members.
According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2.
All other data is available on page 121 of the 2012 international residential code.
For lesser grades spans should be shorter.
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.
Click on the appropriate beam this will take you to the calculation table for your project.
Girders are found in floor systems spanning across piers and support the weight of floor joists.
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.
View joist rafter tables.
