If your wall will be 18 inches thick you should make your concrete footing 24 inches thick.
Wall footing concrete mix.
Mixing your own concrete may take a few adjustments.
Between 3 500 to 5 000 psi on suspended slabs beams and girders.
Recommended mixes for different concrete construction type of work concrete mix ratio max.
Recommended concrete mixes for various types of construction works.
Various types of concrete construction requires different concrete mixes for its construction.
Once you mix together these four ingredients use the back of the shovel to smooth the surface of the mixture.
And walls and columns normally require between 3 000 to 5 000 psi.
Size of aggregates hellip.
The recommended value of these concrete mixes for various types of construction is presented in table below.
1 part portland cement.
Concrete mixed at this ratio is generally known as a c20 mix and it s more than suitable for garden paths concreting fence posts shallow retaining wall foundations some extension bases shed bases and many other domestic and commercial applications.
Fast setting concrete mix also allows you to set posts and poles with no mixing or bracing required.
1 part sand 5 part water.
Your concrete footing should be a little wider than your mortared stone wall.
C20 is a medium strength concrete mix.
You can leave the concrete footing a few inches below grade to make sure it does not show when the wall is finished.
Typically reinforced concrete ranging between 3 500 to 4 000 psi is used on footing and slabs on grade.