Deck Floor Joist Spans

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 inch Joist Spacing, 40 psf live load & 10 psf dead load - Grade #2 lumber
Length In Feet	2 X 6			2 X 8			2 X 10			2 X 12
8
9
10
12
14
16

Table 4 16 inch Joist Spacing, 60 psf live load & 10 psf dead load - Grade #2 lumber
Length In Feet	2 X 6			2 X 8			2 X 10			2 X 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 inch Joist Spacing, 40 psf live load & 10 psf dead load - Grade #2 lumber
Length In Feet	2 X 6			2 X 8			2 X 10			2 X 12
8
9
10
12
14
16

Table 6 24 inch Joist Spacing, 60 psf live load & 10 psf dead load - Grade #2 lumber
Length In Feet	2 X 6			2 X 8			2 X 10			2 X 12
8
9
10
12
14
16