In general poured concrete basement walls that are 8 feet tall or less and have no more than 7 feet of soil pressing against them from the outside function well at a thickness of 8 inches.
How thick are concrete retaining walls.
Step 3 take the frostline into account.
Where i m conflicted is the case of a 8 or 10 thick cantilever wall or basement wall that isn t very tall.
Agent666 good points.
Concrete retaining wall footing size.
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.
A poured concrete footing for concrete block or brick walls should be at least twice as wide as the planned wall.
For example if you are pouring a retaining wall that will be 12 inches thick and will use wooden planks that are 1 1 2 inches thick for your forms you ll need to space the stakes about 15 inches apart.
When a taller wall or a higher level of soil or both come into play the thickness should increase to 10 inches.
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.
The footing should be at least as thick vertically as the wall s planned width.
This can add several inches to the wall s thickness dimensions and can vary depending on the severity of exposure soil type and reactivity etc.