Wooden I Beam Span Table

These span tables are based on uniform loads as noted above.

Wooden i beam span table.

On longer spans the beam may require much more bearing space as indicated by this table. Conventional lumber can shrink twist and warp as the moisture found naturally in the wood evaporates. I joist basics i joists are strong lightweight i shaped engineered wood structural members that meet demanding performance standards. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

Joist and rafter span tables. These nine beam spans are for built up beams made up of either 2x8 2x10 or 2x12 dimensional lumber nailed together as either 3 4 or 5 ply beams. Engineered wood products ewp span and size charts for bci joists. Allowable load tables 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.

Bci joists are specially constructed i joists with flanges made from strong versa lam laminated veneer lumber with oriented stranded board webs and approved waterproof structural adhesives providing outstanding strength and durability. Anything 5 and above we always at least double cripple. Floor performance is greatly influenced by the stiffness of the floor joists. Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.

Wood i beam blocking panels may be used in place of the 2x4. The values displayed in the resulting table will show nine possible maximum beam spans for the supported length selected. According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2. Headers beams.

Live load deflection is limited to l 480 for better performance. I joists are comprised of top and bottom flanges which resist bending united with webs which provide outstanding shear resistance. Size selection tables headers beams. When used as part of a flooring system wood i beam joists can help floors stay quiet over time reducing bothersome and costly callbacks.

For example a 3 ply 2x8 beam would use three 2x8s nailed together side by side.