Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Maximum Floor Joist Span

No. 1 and No. 2 Grade of Douglas fir and maximum span floor joists - imperial units

Sponsored Links

Maximum floor joist span for No. 1 and No. 2 Grade of Douglas fir are indicated below. Max. dead load (weight of structure and fixed loads) 10 lbs/ft2Live load is weight of furniture, wind, snow and more.

  • 1 psf (lbf/ft2) = 47.88 N/m2
  • 1 ft = 0.3048 m
  • 1 in = 25.4 mm

Max. Live Load 30 lbs/ft2 (1436 N/m2)

Maximum Span (ft - in)
Nominal Size
(inches)
Joist Spacing Center to Center
(inches)
Lumber Grade
Selected Structural No. 1 No. 2
2 x 6 12 12' - 6'" 12' - 0" 11' - 10"
16 11' - 4" 10' - 11" 10' - 9"
24 9' - 11" 9' - 7" 9' - 1"
2 x 8 12 16' - 6" 15' - 10" 15' - 7"
16 15' - 0" 14' - 5" 14' - 1"
24 13' - 1" 12' - 4" 11' - 6"
2 x 10 12 21' - 0" 20' - 3" 19' - 10"
16 19' - 1" 18' - 5" 17' - 2"
24 16' - 8" 15' - 0" 14' - 1"
2 x 12 12 25' - 7" 24' - 8" 23' - 0"
16 23' - 3" 21' - 4" 19' - 11"
24 20' - 3" 17' - 5" 16' - 3"

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

Maximum Span (ft - in)
Nominal Size
(inches)
Joist Spacing Center to Center
(inches)
Lumber Grade
Selected Structural No. 1 No. 2
2 x 8 12 13' - 1" 12' - 7" 12' - 4"
16 11' - 11" 11' - 5" 10' - 8"
24 10' - 5" 9' - 4" 8' - 8"
2 x 10 12 16' - 8" 16' - 1" 15' - 0"
16 15' - 2" 13' - 11" 13' - 0"
24 13' - 3" 11' - 4" 10' - 7"
2 x 12 12 20' - 3" 18' - 7" 17' - 5"
16 18' - 5" 16' - 1" 15' - 1"
24 15' - 10" 13' - 2" 12' - 4"
2 x 14 12 23' - 11" 20' - 10" 19' - 5"
16 21' - 8" 18' - 0" 16' - 10"
24 17' - 9" 14' - 8" 13' - 9"
Sponsored Links

Related Topics

Related Documents

Sponsored Links

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

Translate
About the Engineering ToolBox!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Citation

This page can be cited as

  • Engineering ToolBox, (2009). Maximum Floor Joist Span. [online] Available at: https://www.engineeringtoolbox.com/floor-joists-span-d_1479.html [Accessed Day Mo. Year].

Modify access date.

. .

close

Scientific Online Calculator

6 24

Sponsored Links
.
I Beam Floor Joist