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

11

7

12

7

13

0

14

0

3x8

16

10

8

11

4

11

9

12

8

2x10

12

12

10

13

9

14

2

15

2

2x10

16

11

7

12

6

12

10

13

10

3x10

12

14

8

15

8

16

2

17

5

3x10

16

13

4

14

3

14

9

15

10

2x12

12

15

4

16

6

17

0

18

3

2x12

16

14

0

15

0

15

5

16

7

Total load, 126 pounds per square foot.

3x12

12

17

6

18

8

19

3

20

9

3x12

16

15

10

17

0

17

7

18

11

2x14

12

17

10

19

1

19

8

21

2

2x14

16

16

2

17

4

17

11

19

3

2½X14

12

19

3

20

6

21

2

22

9

2½XI4

16

17

6

18

8

19

3

20

9

3x14

12

20

5

21

9

22

6

24

3

3x14

16

18

7

19

10

20

6

22

1