Roof Header Span

Listed are 46 tables based on common loading conditions for floor joists ceiling joists and rafters.

Roof header span.

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. The column on the left of each chart labeled beam span represents the beam length with bearing required for your project. So each lineal foot of wall must carry the loads imposed by a 1 foot wide strip in that 14 ft region. 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.

Determine the beam header span length and the span carried supported by the beam header. Click on the appropriate beam this will take you to the calculation table for your project. 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. 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.

Their is no notching permitted in the center third of any beam. Window door garage door headers supporting roof wall floor loads. Anything 5 and above we always at least double cripple. According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2.

The distance in this case is 12 ft 2 ft 14 ft. Window door garage door headers supporting roof loads only. Both headers and girders are beams that are oriented horizontally and transfer load down to walls piers or posts. Spacing should be interpreted as the centre to centre distance between adjacent parallel members.

The lengths and sizes of joists vary depending on the species and quality of the lumber used. Roof load width rlw and floor load width flw can be determined from as1684 or from the images below. On longer spans the beam may require much more bearing space as indicated by this table. Beams of more than one ply must be fastened together with either nails or bolts.

The 1 grade. Required size for a given span. Notches on the outer thirds must not exceed 1 6 of the width of the board. Wood beam calculator american wood council website rafter and joist span faq.