See below for more information on contraction joints.
Pour concrete against wall.
2of4 in this video ninja screeds the extension to the driveway all in real time.
You will be fine pouring concrete up to the brick.
The poured concrete wall has more mass or interlocking cement paste crystals to resist the cracking force.
I would advise locating a vinyl siding company and getting them to break some scraps that they ve laying around about an inch much higher than the concrete will be poured and as far out from the house as the scraps will go.
The hollow block wall is depending solely on the strength of the thin mortar bed between each concrete block.
Did you watch or four video you see the whole job get done from start to fi.
Pour footings and wall.
Create contraction joints every 4 6 feet.
In this video we show you how to pour your basic 16 x 12 concrete slab.
The expansion joint material ejm will eventually deteriorate and leave you a bigger gap then what the concrete settling away from the brick will.
Allow concrete to cure.
If the wall exceeds four feet in height footings should be poured separately.
Concrete should never be poured up against steel siding and or trim.
The addition of reinforcing steel to either wall system complicates the issue.