A. Shingled Roofs Not Plastered.*

Total load, 48 pounds per square foot.

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.

2x4

16

7

4

7

9

8

4

9

6

10

10

2x4

20

6

7

6

10

7

6

8

6

8

10

2x6

16

11

1

11

7

12

6

14

2

15

0

2x6

20

9

11

10

4

11

2

12

8

13

4

3x6

16

13

7

14

2

15

3

17

5

18

3

3x6

20

12

2

12

8

13

8

15

7

16

4

2x8

16

14

9

15

6

16

8

18

11

20

0

2x8

20

13

3

13

10

14

11

16

11

17

10

2x8

24

12

1

12

7

13

7

15

6

16

3

2x10

16

18

6

19

3

20

10

23

8

25

0

2x10

20

16

7

17

3

18

8

21

2

22

3

2x10

24

15

1

15

9

17

0

19

3

20

4

B. Slate Roofs Not Plastered, or Shingle Roofs Plastered.*

Total load, 57 pounds per square foot.

Size of Joists.

Dist. on Centres.

Hemlock.

White Pine.

Spruce.

Oregon Pine.

Georgia Pine.

Ins.

Ft.

Ins.

Ft.

Ins.

Ft.

Ins.

Ft.

Ins.

Ft.

Ins.

2x4

16

6

9

7

I

7

7

8

8

9

2

2x4

20

6

0

6

4

6

9

7

9

8

2

2x6

16

10

2

10

7

11

6

13

0

13

8

2x6

20

9

1

9

6

10

2

11

7

12

3

3x6

16

12

6

13

0

14

1

15

11

16

9

3x6

20

11

•1

11

8

12

7

14

3

15

0

2x8

16

13

7

14

2

15

3

17

4

18

3

2x8

20

12

2

12

8

13

8

15

6

16

4

2x8

24

11

1

II

7

12

6

14

2

14

11

3x8

16

16

7

17

4

18

9

21

3

22

5

3x8

20

14

10

15

6

16

9

19

0

20

1

3x8

24

13

7

14

2

15

3

17

4

18

4

2x10

16

17

0

17

8

19

2

21

7

22

10

2x10

20

15

2

15

10

17

1

19

4

20

6

2x10

24

13

10

14

6

15

7

17

8

18

8