Simplified maximum span tables for selected visual and mechanical grades of southern pine lumber in sizes 2 4 thru 2 12.
Roof header span.
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.
Wood beam calculator american wood council website rafter and joist span faq.
Window door garage door headers supporting roof wall floor loads.
Both headers and girders are beams that are oriented horizontally and transfer load down to walls piers or posts.
Beams of more than one ply must be fastened together with either nails or bolts.
The exterior wall and the headers within will carry all loads from the mid point of the house between the supporting walls to the outside of the house including the roof overhang.
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.
Roof load width rlw and floor load width flw can be determined from as1684 or from the images below.
The lengths and sizes of joists vary depending on the species and quality of the lumber used.
Required size for a given span.
Click on the appropriate beam this will take you to the calculation table for your project.
Their is no notching permitted in the center third of any beam.
Determine the beam header span length and the span carried supported by the beam header.
Window door garage door headers supporting roof loads only.
The 1 grade.
The distance in this case is 12 ft 2 ft 14 ft.
On longer spans the beam may require much more bearing space as indicated by this table.
Notches on the outer thirds must not exceed 1 6 of the width of the board.
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.
Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.
Anything 5 and above we always at least double cripple.
For example you can span a 1 grade no knots southern yellow pine a greater distance than a 2 grade with knots southern yellow pine.
So each lineal foot of wall must carry the loads imposed by a 1 foot wide strip in that 14 ft region.
