Find out how far a 2 x 10 made from No. 2 pine or other material can span as a floor joist according to 2018 International Residential Code for living, bedroom, and storage areas. These six tables cover the most common situations for 16″ o.c. applications. Bedroom areas are sized for 30 lb live load plus 10 lb of dead load(20 lb for ceiling). Living areas are sized for 40 lb live load plus 10 lb of dead load(20 lb for ceiling). For all other applications click here to go the reference in the code book.
2 x 8 Floor Joist Spans
Southern Pine
|
Bedroom
|
Living Area
|
| Number 1 |
14′ 2″ |
12′ 10″ |
| Number 2 |
13′ 3″ |
11′ 10″ |
| Number 3 |
10′ |
8′ 11″ |
| SS |
14′ 8″ |
13′ 4″ |
2 x 10 Floor Joist Spans
Southern Pine
|
Bedroom
|
Living Area
|
| Number 1 |
18′ |
16′ 1″ |
| Number 2 |
15′ 8″ |
14′ |
| Number 3 |
11′ 1″ |
10′ 10″ |
| SS |
18′ 9″ |
17′ |
2 x 12 Floor Joist Spans
Southern Pine
|
Bedroom
|
Living Area
|
| Number 1 |
21′ 4″ |
19′ 1″ |
| Number 2 |
18′ 6″ |
16′ 6″ |
| Number 3 |
14′ 4″ |
12′ 10″ |
| SS |
22′ 10″ |
20′ 9″ |
2 x 8 Floor Joist Spans with Ceiling
Southern Pine
|
Bedroom
|
Living Area
|
| Number 1 |
13′ 9″ |
12′ 7″ |
| Number 2 |
11′ 10″ |
10′ 10″ |
| Number 3 |
8′ 11″ |
8′ 2″ |
| SS |
14′ 8″ |
13′ 4″ |
2 x 10 Floor Joist Spans with Ceiling
Southern Pine
|
Bedroom
|
Living Area
|
| Number 1 |
16′ 1″ |
14′ 8″ |
| Number 2 |
14′ |
12′ 10″ |
| Number 3 |
10′ 10″ |
9′ 10″ |
| SS |
18′ 9″ |
17′ |
2 x 12 Floor Joist Spans with Ceiling
Southern Pine
|
Bedroom
|
Living Area
|
| Number 1 |
19′ 1″ |
17′ 5″ |
| Number 2 |
16′ 6″ |
15′ 1″ |
| Number 3 |
12′ 10″ |
11′ 8″ |
| SS |
22′ 10″ |
20′ 9″ |
