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##### Asked by: Nashira Puri

business and finance construction industry# How wide apart should decking joists be?

Last Updated: 23rd February, 2020

**inches**as measured on center (16

**inches**between the center of adjacent joist boards). If you prefer a more rigid feel, opt for 12

**inches**spacing on center. For commercial applications, 12

**inches**on center is the standard.

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Similarly, you may ask, how far apart should deck joists be?

In general terms, **joists** spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2x8 up to 12 feet; 2x10 to 15 feet and 2x12 to 18 feet. The larger the **deck**, the larger the **joists**.

Similarly, how much space do you need between decking? Overall, conventional **decking** profiles should be installed such that when seasoned, will have gaps **between** 1/8 and 1/4 of an inch. Look at the ends of the boards and install the **decking** "barkside" up to prevent cupping. Install **decking** with 3" pressure-treated compatible **deck** screws instead of nails.

Just so, how far apart are decking bearers?

Due to the proximity to the ground, ventilation is very important. For this reason, the perimeter of the **deck** should be kept open. For **decking**, a minimum spacing **between** boards of 5 mm is recommended.

What size lumber can span 20 feet?

Max. Live Load 60 lbs/ft2 (2873 N/m2)

Maximum Span (ft - in) | ||
---|---|---|

Nominal Size (inches) | Joist Spacing Center to Center (inches) | Lumber Grade |

2 x 12 | 24 | 13' - 2" |

2 x 14 | 12 | 20' - 10" |

16 | 18' - 0" |