# How far can you cantilever a 2x10 deck joist?

Category:
business and finance
civil engineering industry

**Joist Cantilevers**

**cantilevers can**extend up to

**one**-fourth the backspan of the

**joist**. This means that

**joists**, such as southern pine 2x10s at 16 inches on-center, spanning 12 feet are allowed to

**cantilever**up to an additional 3 feet (see illustration, below).

Then, how far can you cantilever a 2x8 deck joist?

**If** the code span tables allow a **2x8** to span 12 feet, then the **cantilever can** be 3 feet.

Just so, how far can you cantilever a 2x6 deck joist?

Looking at the table below, **we** see that **2x6** floor **joists can** be cantilevered up to 2 feet and 6 inches (2'-6") when the **joists** are spaced 16" apart.

**Beams** are permitted to **cantilever past** the end **posts** up to one-quarter of the **beam** span between **posts**. I like to use this provision when sizing **beams**. Often I **can** reduce the span between **posts** slightly by cantilevering the **beam**.