Table 3. Thickness of Walls In Inches For Warehouses, Etc

Height of

Building.

City.

Stories.

1st.

2d.

3d.

4th.

5th.

6th.

7th.

8th.

9th.

10th.

Two

Stories,

Boston,

16

12

New York,

12

12

Chicago,

12

12

Minneapolis,

12

12

Memphis,

18

13

Denver,

13

13

Three Stories,

Boston,

20

16

16

New York,

16

16

12

Chicago,

16

12

12

Minneapolis,

16

12

12

Memphis,

22 1/2

18

13

Denver,

17

13

13

Four Stories,

Boston,

20

16

16

16

New York,

16

16

16

12

Chicago,

20

16

16

12

Minneapolis,

16

16

12

12

Memphis,

27

22 /2

18

13

Denver,

21

17

13

13

Five Stories,

Boston,

20

20

20

20

16

New York,

20

16

16

16

16

Chicago,

20

20

16

16

16

Minneapolis,

20

16

16

12

12

Memphis,

31 1/2

27

22 1/2

18

13

Denver,

21

21

17

17

13

Six Stories,

Boston,

24

20

20

20

20

16

New York,

24

20

20

20

16

16

Chicago,

20

20

20

16

16

16

Minneapolis,

20

20

16

16

16

12

Memphis,

36

31 1/2

27

22 1/2

18

13

Denver,

26

21

21

17

17

13

Seven Stories,

Boston,

24

20

20

20

20

20

16

New York,

28

24

24

20

20

16

16

Chicago,

20

20

20

20

16

16

16

Minneapolis,

20

20

20

16

16

16

12

Memphis,

404

36

31 1/2

27

22 1/2

18

13

Denver,

26

21

21

21

17

17

17

Height of

Building.

City.

Stories.

1st.

2d.

3d.

4th.

5th.

6th.

7th.

8th.

9th.

10th.

Eight Stories,

Boston,

28

24

20

20

20

20

20

16

New York,

32

28

24

24

20

20

16

16

Chicago,

24

24

20

20

20

16

16

16

Minneapolis,

24

20

20

20

16

16

16

12

Memphis,

45

40 1/2

36

31 1/2

27

224

18

13

Denver,

30

26

21

21

21

17

17

17

Nine Stories,

Boston,

28

24

24

20

20

20

20

20

16

New York,

32

32

28

24

24

20

20

16

16

Chicago,

24

24

24

20

20

20

16

16

16

Minneapolis,

24

24

20

20

20

16

16

16

12

Memphis,

49 1/2.

45

40 1/2

36

31 1/2.

27

22 1/2

18

13

Denver,

30

26

26

21

21

21

17

17

17

Ten

Stories,

Boston, New York,

28 36

28 32

24 32

24

28

20 24

20 24

20 20

20 20

20 16

16 16

Chicago,

28

28

24

24

24

20

20

20

16

16

Minneapolis,

24

24

24

20

20

20

16

16

16

12

Memphis,

54

49 1/2

45

401/2

36

31 1/2

27

22 1/2

18

13

Denver,

30

30

26

26

21

21

21

17

17

17

"If over 100 feet in height, each additional 25 feet in height, or part thereof, next above the curb, shall be increased 4 inches in thickness, the upper 100 feet of wall remaining the same as specified for a wall of that height. (See Fig. 73.)

"If there is to be a clear span of over 25 feet between walls, the bearing walls shall be 4 inches more in thickness than is heretofore specified, for every 12 1/2 feet, or fraction thereof, that said walls are more than 25 feet apart."

186. Table 3 gives the thickness of walls required by law for warehouses, etc. in the six cities mentioned.

The tops of the second-floor beams are taken at 19 feet above the sidewalk, and the heights of the other stories are 13 feet 4 inches, including thickness of floors, as the New York and Boston laws give the height of the wall in feet and not in stories.

The Chicago ordinances provide that the maximum heights of stories, in accordance with the thicknesses given in Table 3, are 18 feet in the first story, 15 feet in the second story, 13 feet 6 inches in the third, and 12 feet in the stories above.