Load Bearing Wood Beam

It is important to remember though that while the beam carries the load of the ceiling above all that load is then transferred at the ends to vertical post structures created by a.

Load bearing wood beam.

The species of lumber size of lumber and the load it carries. The decision was made to install a beam that would span the entire kitchen without posts and be recessed in the ceiling. This header must carry x pounds per lineal foot. Beam span maximums are based on a maximum anticipated live load.

Wood gets its strength from its longitudinal cellulose fibers. On longer spans the beam may require much more bearing space as indicated by this table. When loads are borne perpendicular to the grain of the wood the load bearing capacity of the wood is at its least. If the wall is load bearing you will need to carry the weight of the level above by other means such as constructing a beam or buying a special laminated beam.

Two 2 by 4 beams together would not be enough. In beam speak you say. Anything 5 and above we always at least double cripple. Fewer posts on upper level decks are typically more desirable to the occupants and this drives the use of larger framing materials for longer spans.

A dense wood that bears weight on the ends of those fiber bundles like a stump does can achieve the load carrying capacity of structural steel. This translation is the key to any structural sizing. According to the 2012 irc codes any beam joist or header shall never have a bearing of less than 1 1 2. The span of a beam is dependent on a few variables.

You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. Beams of more than one ply must be fastened together with either nails or bolts. A two 2 by 6 standard beam has actual dimensions of 1 5 by 5 5 inches which would give a section modulus of 1 5 x 5 5 x 5 5 6 7 6 which is not enough for this example. Replacing a load bearing beam with a flush beam was our mission last week.

The formula for the section modulus is beam width times beam depth squared divided by 6. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. The client had an existing wood beam with two posts connected to his kitchen island and didn t like seeing the posts. If it s a load bearing wall the inspector may help size the beam or recommend that you have a structural engineer or architect size it.

If you re unsure ask a building contractor or your local building inspector for advice. A load bearing wall almost always has ceiling or floor framing running perpendicular to it.