How far can a triple 2×6, 2×8, 2×10 and 2×12 beam span depends on several factors like, load, span, grades and species of wood, height, construction requirements and building codes.

There are many species of wood/ timber or dimensional lumber used in house construction as wood frame structure. It is used as floor joist, deck beam ceiling joist, pitch roof rafter, flat roof rafter, purlin and Binder.

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. Southern yellow pine is strongest species of wood that can span more distance compared to other species of wood. Grade 1 lumber have higher strength than other grade Lumber due to fewer knots.

A triple 2×6 are made when three 2×6 beam are nailed together, a triple 2×8 are made when three 2×8 beam are nailed together, a triple 2×10 are made when three 2×10 beam are nailed together and a triple 2×12 are made when three 2×12 beam are nailed together.

Deck beam provides structural support to floor joists can be define as several small beams. Floor joists are typically a horizontal structural member that runs across an open space of building on supporting wall or studs. Their function is similar as beams, except floor joists are supported by wall, foundations, or beams framing.

Beam 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. It is like the skeleton/ framing of a building that supports the load which the floor is built to bear. Joists are technically beams that typically spans relatively short distances compared to beams and are made of wood, steel, or engineered wood or lumber.

The longer the joist, the more area of deck the joist supports, and thus the beam supports. For pressure-preservative-treated southern pine no. 2 grade, there is a method that can be used for estimating beam spans for a preliminary design.

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**How far can a triple 2×6, 2×8, 2×10 and 2×12 beam span**

In general, the maximum span for a triple 2×6 beam is typically about 8 feet, while the maximum span for a triple 2×8 beam is typically about 11 feet. Moreover, the maximum span for a triple 2×10 beam is typically about 13 feet, while the maximum span for a triple 2×12 beam is typically about 15 feet.

**How far can a triple 2×6 beam span**

Typically a #2-SYP 2×6 triple deck beam can allow to span a maximum of 8 foot with a total load of 50 psf (40 psf live load + 10 psf dead load) with a deflection limit of L/360.

**How far can a triple 2×8 beam span**

Typically a #2-SYP 2×8 triple deck beam can allow to span a maximum distance from 10 to 11 feet with total load of 50 psf (40 psf live load + 10 psf dead load) with deflection limit L/360. So, a triple 2×8 deck beam can span maximum distance of 10-11 feet.

**How far can a triple 2×10 beam span**

Typically a #2-SYP 2×10 triple deck beam can allow to span a maximum distance from 12 to 13 feet with a total load of 50 psf (40 psf live load + 10 psf dead load) with a deflection limit of L/360. So, a triple 2×10 deck beam can span maximum distance of 12 to 13 feet.

**How far can a triple 2×12 beam span**

Typically a #2-grade southern pine 2×12 triple deck beam can allow to span a maximum distance of 15 feet with a total load of 50 psf (40 psf live load + 10 psf dead load) with a deflection of limit L/360. Thus, a triple 2×12 deck beam can span maximum distance of 15 feet.

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**Conclusion**:-

A #2 grade southern pine 2×6 triple deck beam can span upto maximum distance of 8 feet, a triple 2×10 can span 13 feet, a triple 2×8 can span 11 feet and a triple 2×12 can span 15 feet.