The American Wood Council states that cantilevers are limited to **1/4 the span of the joists**. Joist Spacing (o.c.) Maximum allowable overhang cannot exceed 1/4 of the actual main span.

- How long can you cantilever a deck? According to the new span tables and IRC provisions, 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).

## How long can you cantilever a deck?

According to the new span tables and IRC provisions, **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).

## How far can you cantilever a deck over a beam?

***Beams** may **cantilever** at each end up to ¼ of the of the actual **beam** span. For example, a 16′ **beam** span **can cantilever** a maximum of 4′.

## How far can decking overhang?

Allow for Sufficient Overhang of Decking

A one to two **inch** overhang beyond the outer fascia board is sufficient. This means the installed deck boards should have at least 1.75 to 2.75” overhang before the fascia is installed.

## How far can you cantilever a 2×6 deck joist?

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

## Are cantilever decks safe?

It is **safe** — if you build it properly. There are different forces at work here, and you must follow some special rules. Backspan. In addition to the limit on a **cantilever’s** overhang, a **deck** must also be proportioned to balance weight on its **cantilever**.

## How far can a 2×6 decking span without support?

A **decking** board made up of 2x6s **can span** a maximum **distance** of 24 inches from joist to joist.

## How do you support a cantilever deck?

**Deck** Joist **Cantilever** Rules and Limits

Many building departments limit joist **cantilevers** to 24″ maximum. You must use at least five framing nails to attach the rim joist to the ends of your joists. The American Wood Council states that **cantilevers** are limited to 1/4 the span of the joists.

## How far can a triple 2×12 beam span?

of 14 feet for a **triple 2×12**.

## How far can a 2×10 span without support?

In general terms, joists spaced 16 **inches** on center can span 1.5 times in **feet** their depth in **inches**. A 2×8 up to 12 **feet**; 2×10 to 15 **feet** and 2×12 to 18 **feet**. The larger the deck, the larger the joists.

## Should you use screws or nails for a deck?

For a **deck** build it’s best **to use** a combination of **nails** and **screws**. **Screws** are superior for laying down the **decking**. They hold things flush better and have a better fastener/tensile strength, which keeps boards from popping up over time.

## Should I leave a gap between deck boards?

**Leave gaps between deck boards** to achieve drainage. ‘When securing the **decking**, it is important to **leave** adequate **spacing between** the **boards** for water to drain. The goal is to have about an 1/8-inch **gap** (the diameter of an 8d nail) **between boards** after the **decking** has dried to its equilibrium moisture content.

## Can you attach a deck to a cantilever?

Chuck Lockhart A **deck** ledger cannot be **attached** to **cantilevered** house framing. **Install** a beam with posts and footings along the house end of the **deck**, just as **you would** at the outside of the **deck**. The beam **can** be built into the floor system—say a double or triple rim joist—or it **can** be placed beneath the **deck** joists.

## How far can a 2×6 span on a deck?

Decking made of 2x4s or 2x6s **can span** up to 24 inches. If you will run decking at an angle, you might need to put the joists closer together.

## How many footers do I need for a 12×12 deck?

For an attached 12 x 12′ deck, you’ll need at least **3 footings**, plus at least 2 more if you’re planning on building stairs with it. If your deck will be a different size, it’s easy to figure out how many you’ll need.

## How many posts do I need for a 12×16 deck?

A standard **deck** will need four footings parallel to the house, but they will need to be temporarily braced by 6 inch-by-6 inch **posts**.