Size of Joists.

Dist. on Centres.

White Pine.

Spruce or Norway Pine.

Oregon or Texas Pine.

Georgia Pine.

Ins.

Ft.

Ins.

Ft.

Ins.

Ft.

Ins.

Ft.

Ins.

3x8

12

12

10

13

9

14

2

15

4

3x8

16

11

8

12

6

12

10

13

10

2x10

12

14

1

15

1

15

6

16

7

2x10

16

12

9

13

8

14

1

15

2

3x10

12

16

1

17

3

17

9

19

2

3x10

16

14

8

15

8

16

2

17

5

2x12

12

16

10

18

1

18

8

20

1

2x12

16

15

4

16

5

17

0

18

3

Total load. 96 pounds per square foot.

3x12

12

19

2

20

6

21

2

22

9

3x12

16

17

5

18

7

19

3

20

8

2x14

12

19

6

20

10

21

7

23

2

2x14

16

17

9

19

0

19

7

21

2

2½x14

12

21

1

22

6

23

2

25

0

2½x14

16

19

2

20

4

21

2

22

8

3x14

12

22

4

23

10

24

8

27

7

3x14

16

20

4

21

8

22

5

24

1