Wooden I Beam Span Table

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

Wooden i beam span table.

Conventional lumber can shrink twist and warp as the moisture found naturally in the wood evaporates. These span tables are based on uniform loads as noted above. On longer spans the beam may require much more bearing space as indicated by this table. 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.

Live load deflection is limited to l 480 for better performance. When used as part of a flooring system wood i beam joists can help floors stay quiet over time reducing bothersome and costly callbacks. Experience has shown that joists designed to the. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

I joists are comprised of top and bottom flanges which resist bending united with webs which provide outstanding shear resistance. Span tables use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. Headers beams. 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.

According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2. Anything 5 and above we always at least double cripple. Size selection tables headers beams. 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.

Engineered wood products ewp span and size charts for bci joists. Wood i beam blocking panels may be used in place of the 2x4. 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. Floor performance is greatly influenced by the stiffness of the floor joists.

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.