See below for more information on contraction joints remove forms and install waterproofing and drainage system.
Pouring concrete wall against existing wall.
The poured concrete wall has more mass or interlocking cement paste crystals to resist the cracking force.
If you want to build a concrete retaining wall you should consider pouring the wall rather than making it out of concrete blocks.
The addition of reinforcing steel to either wall system complicates the issue.
Pouring a concrete retaining wall is not that difficult and this easy to follow how to guide will show you just what to do.
Allow concrete to cure.
Concrete should never be poured up against steel siding and or trim.
Create contraction joints every 4 6 feet.
Finish the surface of the wall as desired.
A poured wall is much stronger and generally last many more years than a block wall.
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.
Pour footings and wall.
This is just a quick video for my friend who is building a home.
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.