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FLOOR JOISTS
Residential Occupancies

40# Live Load, 10# Dead Load, 1/360

Span (feet and inches)

Species

Grade

2x6

2x8

2x10

2x12

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

Douglas Fir

Sel. Struc.

11-4

10-4

9-0

15-0

13-7

11-11

19-1

17-4

15-2

23-3

21-1

18-5

Larch  

No. 1 & Btr

11-2

10-2

8-10

14-8

13-4

11-8

18-9

17-0

14-9

22-10

20-9

17-1

No. 1

10-11

9-11

8-8

14-5

13-1

11-0

18-5

16-5

13-5

22-0

19-1

15-7

No. 2

10-9

9-9

8-3

14-2

12-9

10-5

18-0

15-7

12-9

20-11

18-1

14-9

 

FLOOR JOISTS
Light Storage

125# Live Load, 10# Dead Load, 1/360

Span (feet and inches)

Species

Grade

2x8

2x10

2x12

2x14

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

Douglas Fir

Sel. Struc.

10-3

9-4

8-1

13-1

11-10

10-0

15-11

14-3

11-7

18-4

15-11

13-0

Larch  

No. 1 & Btr

10-1

9-0

7-4

12-8

11-0

8-11

14-8

12-9

10-5

16-5

14-3

11-7

No. 1

9-6

8-2

6-8

11-7

10-0

8-2

13-5

11-7

9-6

15-0

13-0

10-7

No. 2

9-0

7-9

6-4

11-0

9-6

7-9

12-9

11-0

9-0

14-3

12-4

10-1

 

CEILING JOISTS
Ceilings where the roof slope is steeper than 3 in 12.

20# Live Load, 10# Dead Load, 1/240

Span (feet and inches)

Species

Grade

2x4

2x6

2x8

2x10

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

Douglas Fir

Sel. Struc.

10-5

9-6

8-3

16-4

14-11

13-0

21-7

19-7

17-2

27-6

25-0

21-3

Larch  

No. 1 & Btr

10-3

9-4

8-1

16-1

14-7

12-3

21-2

19-1

15-7

26-10

23-3

19-0

No. 1

10-0

9-1

7-8

15-9

13-9

11-2

20-1

17-5

14-2

24-6

21-3

17-4

No. 2

9-10

8-11

7-3

15-0

13-0

10-8

19-1

16-6

13-6

23-3

20-2

16-5

Rafters
All tables assume no snow loads and a 1.25 Duration of Load adjustment has been applied.

ROOF RAFTERS
Roof slope 3 in 12 or less. Light roof covering, no ceiling.

20# Live Load, 10# Dead Load, 1/240

Span (feet and inches)

Species

Grade

2x6

2x8

2x10

2x12

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

Douglas Fir

Sel. Struc.

16-4

14-11

13-0

21-7

19-7

17-2

27-6

25-0

21-10

33-6

30-5

26-7

Larch  

No. 1 & Btr

16-1

14-7

12-9

21-2

19-3

16-10

27-1

24-7

21-3

32-11

29-11

24-8

No. 1

15-9

14-4

12-6

20-10

18-11

15-10

26-6

23-9

19-5

31-10

27-6

22-6

No. 2

15-6

14-1

11-11

20-5

18-5

15-1

26-0

22-6

18-5

30-2

26-1

21-4

 

ROOF RAFTERS
Roof slope greater than 3 in 12; light roof covering; no ceiling.

20# Live Load, 7# Dead Load, 1/180

Span (feet and inches)

Species

Grade

2x6

2x8

2x10

2x12

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

Douglas Fir

Sel. Struc.

18-0

16-4

14-4

23-9

21-7

18-10

30-4

27-6

24-1

36-10

33-6

29-0

Larch  

No. 1 & Btr

17-8

16-1

14-1

23-4

21-2

18-4

29-9

27-1

22-5

36-2

31-10

25-11

No. 1

17-4

15-9

13-3

22-11

20-6

16-9

28-11

25-0

20-5

33-6

29-0

23-8

No. 2

17-0

15-4

12-6

22-5

19-5

15-10

27-5

23-9

19-5

31-10

27-6

22-6

 

ROOF RAFTERS
Roof slope 3 in 12 or less. Heavy roof covering, no ceiling.

20# Live Load, 15# Dead Load, 1/180

Span (feet and inches)

Species

Grade

2x6

2x8

2x10

2x12

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

Douglas Fir

Sel. Struc.

18-0

16-4

14-3

23-9

21-7

18-0

30-4

26-11

22-0

36-1

31-3

25-6

Larch  

No. 1 & Btr

17-8

15-7

12-9

22-9

19-9

16-1

27-10

24-1

19-8

32-3

27-11

22-10

No. 1

16-5

14-3

11-7

20-9

18-0

14-8

25-5

22-0

17-11

29-5

25-6

20-10

No. 2

15-7

13-6

11-0

19-9

17-1

13-11

24-1

20-10

17-0

27-11

24-2

19-9

 

ROOF RAFTERS
Roof slope 3 in 12 or less. Light roof covering.
Heavy roof covering, no ceiling. OR Flat roof
or cathedral ceiling with drywall finish.

20# Live Load, 15# Dead Load, 1/240

Span (feet and inches)

Species

Grade

2x6

2x8

2x10

2x12

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

Douglas Fir

Sel. Struc.

16-4

14-11

13-0

21-7

19-7

17-2

27-6

25-0

21-10

33-6

30-5

25-6

Larch  

No. 1 & Btr

16-1

14-7

12-9

21-2

19-3

16-1

27-1

24-1

19-8

32-3

27-11

22-10

No. 1

15-9

14-3

11-7

20-9

18-0

14-8

25-5

22-0

17-11

29-5

25-6

20-10

No. 2

15-6

13-6

11-0

19-9

17-1

13-11

24-1

20-10

17-0

27-6

23-10

19-6

 

ROOF RAFTERS
Heavy roof covering; flat roof or cathedral ceiling with drywall
finish.

20# Live Load, 25# Dead Load, 1/240

Span (feet and inches)

Species

Grade

2x6

2x8

2x10

2x12

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

12 oc

16 oc

24 oc

Douglas Fir

Sel. Struc.

16-4

14-11

12-6

21-7

19-5

15-10

27-5

23-9

19-5

31-10

27-6

22-6

Larch  

No. 1 & Btr

15-10

13-9

11-2

20-1

17-5

14-2

24-6

21-3

17-4

28-5

24-8

20-1

No. 1

14-6

12-6

10-3

18-4

15-10

12-11

22-5

19-5

15-10

25-11

22-6

18-4

No. 2

13-9

11-11

9-8

17-5

15-1

12-4

21-3

18-5

15-0

24-8

21-4

17-5

 

     

     

       

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