Table 756-19A
Concrete Wall Thickness
| |||
---|---|---|---|
Type of Concrete
|
Nominal Thickness
(inches)
|
Maximum Height of Unbalanced Fill1 for Wood Frame Wall Being Supported
(feet)
| |
3,000 psi
|
6
|
6.5
| |
Unreinforced concrete
|
8
|
8
| |
10
|
9
| ||
122
|
10
| ||
14
|
11.5
|
NOTES:
| ||
---|---|---|
1
|
Unbalanced fill is the difference in elevation between the outside
grade and the basement floor.
| |
2
|
The maximum height of unbalanced fill for a twelve-inch thick
plain concrete wall may be increased to 12 feet, provided the wall
is constructed of concrete with a minimum compressive value of 6,000
psi at 28 days.
|
Table 756-19B
Maximum Depth Below Grade* (Height of Fill) and
Thickness for Various Concrete Masonry Foundation
Walls Without Pilasters
| ||||
---|---|---|---|---|
Maximum Depth Below Grade (feet) When Wall Supports
| ||||
Type of Unit
Wall Construction Nominal Thickness (inches)
|
Frame Construction
|
Masonry or Masonry Veneer Construction
| ||
Hollow — load bearing
| ||||
8
|
5 (6)
|
6
| ||
10
|
6 (7)
|
7
| ||
12
|
7
|
7
| ||
Solid — load bearing
| ||||
8
|
5 (7)
|
7
| ||
10
|
6 (7)
|
7
| ||
12
|
7
|
7
|
NOTES:
| ||
---|---|---|
*
|
In well-drained sand and gravel soils, the height of the unbalanced
fill may be increased to the values in parentheses.
|
Table 756-19C
Maximum Depth Below Grade (Height of Fill)
for Various Concrete Masonry Foundation Walls With Pilasters
| |||||
---|---|---|---|---|---|
Type of Unit
Wall Construction Nominal Thickness (inches)
|
Total Height of Wall
(feet)
|
Maximum Pilaster Spacing O.C.
(feet)
|
Pilaster Size (Nominal)
(inches)
|
Maximum Depth Below Grade
(feet)
| |
8 hollow load-bearing
|
7.5
|
11
|
16 x 16
|
6.5
| |
8 hollow load-bearing with solid pilasters or filled cells of
hollow units
|
7.5
|
20
|
16 x 16
|
6.5
|
Table 756-19D
Maximum Depth Below Grade for Partially Reinforced Masonry
Walls
| ||||
---|---|---|---|---|
Type of Unit
Wall Construction Nominal Thickness (inches)
|
Total Height of Wall
(feet)
|
Reinforcement Size and Spacing (feet) Center to Center
|
Maximum Depth Below Grade
(feet)
| |
8 hollow load-bearing
|
7.0 to 8.5
|
No. 5 Bars at 8
|
6.5
| |
No. 6 Bars at 8
|
7.5
| |||
No. 7 Bars at 8
|
7.5
|