## How far can engineered joists span?

Joists are available in several depths and lengths and superior strength allows them to span up to 30 feet (TRIFORCE span tables).

## How far can a 12 inch I joist span?

You can go up to 17 feet, 9 inches if you use 9-12 inch-deep joists that are 12 inches on-center.

**How far can you span a 14 inch I joist?**

What size i joist to span 26′:- as per general thumb rules and guideline, a 3-1/2″×14″ size of i joists made of engineered wood can allows spans up to 26 feet for a live load of 40 pounds per square foot and dead load of 10 pounds per square foot when spaced 16 inches apart.

**What can I use instead of I-joist?**

You can go the traditional floor framing method with dimensional lumber, otherwise known as 2×10’s or 2×12’s. Or, you can use a manufactured floor truss, which is typically made up of 2×3 or 2×4 members and are designed and built by your local truss plant.

### What is the maximum span for a 2×12 floor joist?

What is the maximum span for a 2×12 floor joist? 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. Click to see full answer. Subsequently, one may also ask, what is the maximum span for a 2×10 floor joist?

### How much weight can 2×10 floor joists hold?

Douglas fir 2-by-10 joists graded as “Structural Select” allows joist spans up to 21 feet for a live load of 30 pounds per square foot when spaced 12 inches apart, 19 feet 1 inch for 16 inch spacing and 16 feet 8 inches for 24 inch spacing. A live load of 60 pounds per square foot demands more support and shorter spans.

**What size joist per span?**

The joist span tables start with 2×6 lumber and it goes all the way up to 2×12. For example, a 2×6 Southern Pine joist can span 12’. A 2×12 joist of the same species and quality can span nearly 25’. The spans listed in the span tables of the IRC indicate max span, so many contractors will often overbuild a floor for the sake of stability.

**How far apart should floor joists be?**

With some structures, floor joists are required to be 12 or 24 inches apart on center. To find the actual distance between the inside edges of each adjacent floor joist, subtract 1-¾ inches from either 12 or 24 inches.