The addition of reinforcing steel to either wall system complicates the issue.
Pouring concrete wall against existing wall.
This is just a quick video for my friend who is building a home.
The hollow block wall is depending solely on the strength of the thin mortar bed between each concrete block.
Pouring a concrete retaining wall is not that difficult and this easy to follow how to guide will show you just what to do.
Pour footings and wall.
If the wall exceeds four feet in height footings should be poured separately.
I noticed something in his video that raised a red flag for me so i thought i would rough ou.
Allow concrete to cure.
If you want to build a concrete retaining wall you should consider pouring the wall rather than making it out of concrete blocks.
The poured concrete wall has more mass or interlocking cement paste crystals to resist the cracking force.
Finish the surface of the wall as desired.
A poured wall is much stronger and generally last many more years than a block wall.
With no joint footing even if the subsurface was very stable it would not work because water would eventually get between the wall and the patio and undermine the subsurface and then bad things would begin to happen.
Anyway regardless of whether your house is made of masonry block with a fake stone veneer or is really of stone you cannot pour concrete against the wall unless both share the same footing.