Table No. 1
Footings and Foundations
| |||||
---|---|---|---|---|---|
Number of Stories
|
Thickness Foundation Walls
|
Width of Footing
(inches)
|
Thickness of Footing
(inches)
|
Depth of Foundation and Footing Below Grade Level
(feet)
| |
Concrete
|
Unit Masonry
| ||||
Masonry
| |||||
1
|
8
|
10
|
22
|
10
|
3
|
2
|
10
|
12
|
22
|
12
|
3
|
Masonry Veneer
| |||||
1
|
8
|
22
|
10
|
3
| |
2
|
10
|
22
|
12
|
3
| |
Wood Frame
| |||||
1
|
8
|
16
|
8
|
3
| |
1
|
20
|
10
|
3
| ||
2
|
10
|
22
|
12
|
3
| |
Basement Piers and Columns
| |||||
20 x 20
|
10
|
Table No. 2
Allowable Sizes of Steel Beams
| ||||
---|---|---|---|---|
Width of Floor Tributary to Beam
(feet)
|
Length of Span of Beam
(feet)
|
Number of Floors
|
Size of Steel I-Beam
| |
(inches)
|
(pounds per foot)
| |||
14
|
8
|
1
|
6
|
12.5
|
16
|
8
|
1
|
6
|
12.5
|
18
|
8
|
1
|
6
|
12.5
|
10
|
9
|
1
|
5
|
10
|
12
|
9
|
1
|
5
|
10
|
14
|
9
|
1
|
6
|
12.5
|
16
|
9
|
1
|
6
|
12.5
|
18
|
9
|
1
|
6
|
12.5
|
10
|
10
|
1
|
5
|
10
|
12
|
10
|
1
|
6
|
12.5
|
14
|
10
|
1
|
6
|
12.5
|
16
|
10
|
1
|
7
|
15.3
|
18
|
10
|
1
|
7
|
15.3
|
10
|
11
|
1
|
6
|
12.5
|
12
|
11
|
1
|
6
|
12.5
|
14
|
11
|
1
|
7
|
15.3
|
16
|
11
|
1
|
7
|
15.3
|
18
|
11
|
1
|
7
|
15.3
|
10
|
12
|
1
|
6
|
12.5
|
12
|
12
|
1
|
7
|
15.3
|
14
|
12
|
1
|
7
|
15.3
|
16
|
12
|
1
|
8
|
18.4
|
18
|
12
|
1
|
8
|
18.4
|
10
|
7
|
2
|
6
|
12.5
|
12
|
7
|
2
|
6
|
12.5
|
14
|
7
|
2
|
6
|
12.5
|
16
|
7
|
2
|
7
|
15.3
|
18
|
7
|
2
|
7
|
15.5
|
10
|
8
|
2
|
6
|
12.5
|
12
|
8
|
2
|
6
|
12.5
|
14
|
8
|
2
|
7
|
15.3
|
16
|
8
|
2
|
7
|
15.3
|
18
|
8
|
2
|
7
|
15.3
|
Table No. 3
Allowable Spans for Floor Joists
(One- and Two-Family Dwellings)
| ||
---|---|---|
Maximum Allowable Span
(feet and inches)
| ||
Spacing Below
(inches)
|
C to C
|
Plaster Ceiling
|
2 x 8
|
12
|
13-10
|
16
|
12-1
| |
2 x 10
|
12
|
17-5
|
16
|
15-2
| |
2 x 12
|
12
|
20-11
|
16
|
18-3
| |
2 x 14
|
12
|
24-4
|
16
|
21-4
| |
3 x 6
|
12
|
12-4
|
16
|
11-3
| |
3 x 8
|
12
|
16-4
|
16
|
14-11
| |
3 x 10
|
12
|
20-6
|
16
|
18-10
| |
3 x 12
|
12
|
24-6
|
16
|
22-7
|
Table No. 4
Headers
| |
---|---|
Size of Headers
|
Maximum Allowable Span
(feet)
|
2 - 2 x 6 on edge
|
6
|
2 - 2 x 8 on edge
|
8
|
2 - 2 x 10 on edge
|
10
|
2 - 2 x 12 on edge
|
12
|
Table No. 5
Allowable Spans for Ceiling Joists and Roof Rafters
[Based on standard (No. 2) fir, 1100 f. and 30 lb. live
load]
| ||||
---|---|---|---|---|
Maximum Allowable Span Rafters
| ||||
Size
|
Spacing C to C Ceiling
(inches)
|
Joists
|
Slope less than 4 to 12
|
Slope 4 to 12 or more
|
2 x 4*
|
12
|
11-0
|
9-11
|
11-0
|
16
|
10-1
|
8-8
|
9-7
| |
24
|
8-11
|
7-1
|
7-11
| |
2 x 6
|
12
|
16-7
|
15-1
|
16-9
|
16
|
15-4
|
13-3
|
14-8
| |
24
|
13-8
|
10-11
|
12-2
| |
2 x 8
|
12
|
21-7
|
19-10
|
21-10
|
16
|
20-1
|
17-5
|
19-3
| |
24
|
17-11
|
14-6
|
16-0
| |
2 x 10
|
12
|
26-9
|
24-9
|
27-2
|
16
|
25-0
|
21-10
|
24-0
| |
24
|
22-5
|
18-2
|
20-1
|
*
|
Not permitted in dwellings.
|