2x12 lvl beam span table code#

Joists are technically beams that typically spans relatively short distances compared to beams and are made of wood, steel, or engineered wood or lumber.Īs a general guide, a 2×6 double deck beam (#2 grade Southern Pine) can span up to 6 feet without support with a total load of 50 psf (40 psf live load + 10 psf dead load) and deflection limit of L/360. It is like the skeleton/ framing of a building that supports the load which the floor is built to bear.

Their function is similar as beams, except floor joists are supported by wall, foundations, or beams framing.īeam carries the load and transfer the dead load of the subfloor and floor finishes and live load of people, furniture and furnishings to walls, headers, or foundation walls.

Floor joists are typically a horizontal structural member that runs across an open space of building on supporting wall or studs. Grade 1 lumber have higher strength than other grade Lumber due to fewer knots.Ī double 2×6 are made when two 2×6 beam nailed together, a double 2×8 are made when two 2×8 beam nailed together, a double 2×10 are made when two 2×10 beam nailed together and a double 2×12 are made when two 2×12 beam nailed together.ĭeck beam provides structural support to floor joists can be define as several small beams. Southern yellow pine is strongest species of wood that can span more distance compared to other species of wood. To calculate the maximum spans of species not shown above, use the Span Calculator or the Span Tables for Joists and Rafters on the American Wood Council website.There are different depth of deck beam made of timber are used in floor construction such as 2×6, 2×8, 2×10 and 2×12 etc made of different species of wood (southern yellow pine & Douglas fir) and different grade such as grade – 1, grade – 2, grade – 3.

2x12 lvl beam span table code#

To calculate maximum rafter spans using different design criteria (load, snow load, spacing, grade, etc.) for these common lumber species, see the International Residential Code (IRC). The span values (displayed above) are from the American Softwood Lumber standard sizes. Rafters with ceiling not attached to rafters, ground snow load = 50 Psf, dead load = 20 Psf, deflection limit L/180 The following span table uses a moderate snow load of 50 Psf, but yours could be more or less. Consult your local building code authority to determine the snow load in your area. Note: Snow load factors can be specific to the regional location of a structure. Rafter Span Tables Rafters with ceiling not attached to rafters, live load = 20 Psf, dead load = 20 Psf, deflection limit L/180 The braces need to be supported by a bearing wall, shown in the diagram above.Įxample: In the rafter span table below, the highlighted cell (13-0) indicates that a 2' x 8' Douglas Fir rafter, with a grade of #2, spaced 24' apart, can have a maximum span of 13 feet - 0 inches (13-0) if designed for a live load of 20 Psf, and dead load of 20 Psf. Note also that you can break up the span of a rafter by adding a purlin and bracing to the underside. When calculating the maximum span of a rafter, use the horizontal distance between two vertical supports.