Size of Joists.

Dist. on Centres.

Hemlock.

White Pine.

Spruce or

Norway

Pine.

Oregon or Texas Pine.

Georgia Pine.

Ins.

Ft.

Ins.

Ft.

Ins.

Ft.

Ins.

Ft.

Ins.

Ft.

Ins.

2x6

12

9

9

9

10

10

5

10

10

11

7

2x6

16

8

9

8

10

9

6

9

10

10

6

3x6

12

II

1

11

2

12

0

12

5

13

4

3x6

16

10

1

10

2

10

10

11

2

12

I

2x8

12

12

11

13

I

13

11

14

5

15

6

2x8

16

11

9

11

10

12

8

13

1

14

1

3x8

12

14

9

14

II

16

0

16

6

17

8

3x8

16

13

6

13

7

14

6

15

0

16

2

2x10

12

16

2

16

4

17

5

18

0

19

4

2x10

16

14

9

14

10

15

9

16

4

17

7

Total load, 66 pounds per square foot.

3x10

12

18

0

18

1

19

3

20

0

21

6

3x10

16

16

3

16

5

17

7

18

2

19

6

2x12

12

18

10

19

0

20

3

20

10

22

6

2x12

16

17

2

17

3

18

4

19

O

20

6

3x12

12

21

6

21

8

23

2

24

O

25

9

3x12

16

19

7

19

8

21

1

21

9

23

5

2x14

12

22

0

22

2

23

8

24

4

26

3

2x14

16

20

0

20

1

21

6

22

2

23

10

2½xl4

12

23

8

23

10

25

6

26

3

28

3

2½xi4

16

21

6

21

8

23

2

23

10

25

8

3x14

12

25

4

25

4

27

1

28

0

30

I

3x14

16

23

0

23

0

24

7

25

4

27

4