Typically a #2-Southern pine of a double 2×8 deck beam can span upto 8 feet when total load of 50 psf (40 psf live load + 10 psf dead load) with deflection limit L/360. 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. 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.
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