Cement boards generally come in 1 4 inch 1 2 inch and 5 8 inch thicknesses.
Thickness for concrete wall.
Minimum wall thickness 2500 psi concrete wall 8 0 high with 7 4 of backfill 6 inches.
While a minimum thickness of 150mm for a wall is possible 180 250mm is recommended to aid detailing and construction.
Inside diameter inches inches wall thickness class 1 class 2 class 3 4 6 8 1 10 1 1 12 1 1 1.
Plain concrete and grouted brick masonry wall it is possible to adopt 152mm 6 ft thickness of plain concrete and grouted brick masonry wall.
Section 11 3 1 1 states that the minimum thickness shall be based on the shorter of either the unsupported wall height or length.
The thickness of bearing wall masonry with a height of 3 65m 12 ft above roof level or penthouses can be assumed to be 203 2mm 8 inch.
Holding up under pressure.
Poured concrete foundation walls that are less than 8 feet tall and have soil outside that is 6 or 7 feet deep against the wall can often be 8 inches thick and function quite well.
In general poured concrete basement walls that are 8 feet tall or less and have no more than 7.
10 inches wall 9 0 high with 8 4 of backfill 8 inches.
For more on designing bearing walls refer to chapter 11 of aci 318 19.
As soon as you go higher or have greater depths of soil pushing against the wall you need to increase the thickness to 10 inches.
Reinforced circular pipe class 1500d to class 3750d astm c 76 aashto m 170 wall b.
Walls thinner than 250mm can incur concrete compaction problems due to the congestion of reinforcement particularly near openings.
When planning the thickness of foundation walls.
Thus it appears that in the example you provided the minimum wall thickness is 6 inches.
The taller the wall the thicker it must be.