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

6

13

4

13

9

14

10

3x8

16

11

4

12

2

12

6

13

6

2x10

12

13

7

14

7

15

1

16

2

2x10

16

12

4

13

3

13

8

14

9

3x10

12

15

8

16

9

17

3

18

7

3x10

16

14

2

15

2

15

8

16

10

2x12

12

16

5

17

7

18

1

19

6

2X12

16

14

10

15

11

16

5

17

8

Total load, 105 pounds per square foot.

3x12

12

18

7

19

11

20

6

22

1

3x12

16

16

10

18

1

18

7

20

1

2x14

12

19

0

20

3

20

10

22

6

2x14

16

17

3

18

5

19

0

20

6

2½x14

12

20

4

21

9

22

6

24

3

2½XI4

16

18

7

19

10

20

6

22

1

3x14

12

21

8

23

2

23

10

25

9

3x14

16

19

8

21

1

21

9

23

4