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Deck Floor Joist Spans - Part 2

Floor Joist Spans For Decks - 16″ & 24″ Joist Spacing

Part 1 - 12″ Joist Spacing

Following are tables for the two most common required psf loads for 16 inch joist spacing. All of the tables are based on the use of #2 grade lumber.

Table 3 is for 40 psf live load and 10 psf dead load on 16 inch joist centers.

Table 4 is for 60 psf live load and 10 psf dead load on 16 inch joist centers.

Table 3

16″ Joist Spacing, 40 psf live load & 10 psf dead load - Grade #2 lumber

 
southern pine name
western cedar name
redwood name

Length In Feet

2 × 6

8

     

9

     

10

     

12

     

14

     

16

     
 
southern pine name
western cedar name
redwood name

Length In Feet

2 × 8

8

     

9

     

10

     

12

     

14

     

16

     
 
southern pine name
western cedar name
redwood name

Length In Feet

2 × 10

8

     

9

     

10

     

12

     

14

     

16

     
 
southern pine name
western cedar name
redwood name

Length In Feet

2 × 12

8

     

9

     

10

     

12

     

14

     

16

     

Table 4

16″ Joist Spacing, 60 psf live load & 10 psf dead load - Grade #2 lumber

 
southern pine name
western cedar name
redwood name

Length In Feet

2 × 6

8

     

9

     

10

     

12

     

14

     

16

     
 
southern pine name
western cedar name
redwood name

Length In Feet

2 × 8

8

     

9

     

10

     

12

     

14

     

16

     
 
southern pine name
western cedar name
redwood name

Length In Feet

2 × 10

8

     

9

     

10

     

12

     

14

     

16

     
 
southern pine name
western cedar name
redwood name

Length In Feet

2 × 12

8

     

9

     

10

     

12

     

14

     

16

     

Following are tables for the two most common required psf loads for 24 inch joist spacing. All of the tables are based on the use of #2 grade lumber.

Table 5 is for 40 psf live load and 10 psf dead load on 24 inch joist centers.

Table 6 is for 60 psf live load and 10 psf dead load on 24 inch joist centers.

Table 5

24″ Joist Spacing, 40 psf live load & 10 psf dead load - Grade #2 lumber

 
southern pine name
western cedar name
redwood name

Length In Feet

2 × 6

8

     

9

     

10

     

12

     

14

     

16

     
 
southern pine name
western cedar name
redwood name

Length In Feet

2 × 8

8

     

9

     

10

     

12

     

14

     

16

     
 
southern pine name
western cedar name
redwood name

Length In Feet

2 × 10

8

     

9

     

10

     

12

     

14

     

16

     
 
southern pine name
western cedar name
redwood name

Length In Feet

2 × 12

8

     

9

     

10

     

12

     

14

     

16

     

Table 6

24″ Joist Spacing, 60 psf live load & 10 psf dead load - Grade #2 lumber

 
southern pine name
western cedar name
redwood name

Length In Feet

2 × 6

8

     

9

     

10

     

12

     

14

     

16

     
 
southern pine name
western cedar name
redwood name

Length In Feet

2 × 8

8

     

9

     

10

     

12

     

14

     

16

     
 
southern pine name
western cedar name
redwood name

Length In Feet

2 × 10

8

     

9

     

10

     

12

     

14

     

16

     
 
southern pine name
western cedar name
redwood name

Length In Feet

2 × 12

8

     

9

     

10

     

12

     

14

     

16