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Span tables – joists

Floor Joists - Living Quarters Span Tables

Hem-Fir No. 1 & 2

Subfloor
Thickness

Installation

2X8

2X10

2X12

Joist Spacing

Joist Spacing

Joist Spacing

12"

16"

12"

16"

12"

16"

5/8

A

12-2

11-7

14-4

13-8

16-5

15-7

B

13-6

12-10

15-10

15-1

18-1

17-3

C

13-9

12-10

15-10

14-10

17-10

16-7

D

14-2

12-11

17-7

16-4

19-8

18-4

E

13-1

12-4

15-3

14-4

17-2

16-2

3/4

A

12-11

12-2

15-3

14-4

17-5

16-5

B

14-2

12-11

16-10

15-10

19-3

18-1

C

14-2

12-11

17-2

15-10

19-4

17-10

D

14-2

12-11

18-2

16-6

21-4

19-8

E

14-2

12-11

16-6

15-3

18-7

17-2

Spruce-Pine-Fir No. 1 & 2

Subfloor
Thickness

Installation

2X8

2X10

2X12

Joist Spacing

Joist Spacing

Joist Spacing

12"

16"

12"

16"

12"

16"

5/8

A

11-7

11-0

13-8

13-0

15-7

14-10

B

12-10

12-2

15-1

14-4

17-3

16-5

C

13-1

12-2

15-1

14-1

17-0

15-10

D

13-6

12-4

16-8

15-7

18-9

17-6

E

12-5

11-9

14-6

13-8

16-4

15-5

3/4

A

12-4

11-7

14-6

13-8

16-7

15-7

B

13-6

12-4

16-1

15-1

18-4

17-3

C

13-6

12-4

16-4

15-1

18-5

17-0

D

13-6

12-4

17-3

15-8

20-4

18-9

E

13-6

12-4

15-8

14-6

17-9

16-4

A: Strapping or Ceiling Finish to Underside of Joists
B: Strapping and Glued Subfloor or Ceiling Finish to Underside of Joists and Glued Subfloor.
C: Bridging and Strapping or Bridging and Ceiling Finish to Underside of Joists.
D: Bridging and Strapping and Joists Glued to Subfloor or Bridging and Ceiling Finish to Undersideof Joists and Joists Glued to Subfloor.
E: Bridging Only.

Information compiled for your convenience from "The Span Book" Canadian Wood Council 2009 Edition. For expanded options refer to "The Span Book" 2009 Edition.