C. Slate Roofs Plastered, or Gravel Roofs Not Plastered.*

Total load, 66 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.

2x6

16

9

5

9

10

10

8

12

1

12

9

2x6

20

8

6

8

10

9

6

10

9

11

5

3x6

16

11

7

12

1

13

1

14

10

15

7

3x6

20

10

4

10

10

11

8

13

3

14

0

2x8

16

72

7

13

2

14

2

16

2

17

0

2x8

20

II

3

11

9

12

9

14

5

15

2

2x8

24

10

3

10

9

11

7

13

2

13

10

3x8

16

15

5

16

1

17

5

19

9

20

10

3x8

20

13

9

14

5

15

3

17

8

18

8

3x8

24

12

7

13

2

14

2

16

2

17

0

2x10

16

15

9

16

6

17

9

20

2

21

3

2x10

20

14

1

14

8

15

11

18

0

19

0

2x10

24

12

10

13

5

14

6

16

6

17

5

2x12

16

18

10

19

9

21

4

24

2

25

6

2x12

20

16

10

17

8

19

1

21

8

22

10

2x12

24

15

5

16

1

17

5

19

9

20

10

* These tables are intended for climates where a snow fall of a feet may be expected. In the Southern States, where there is no snow to speak of, the spans in the first section will be sale for slate or gravel roofs if the joists are sawn full to dimensions.