The expansion joint material ejm will eventually deteriorate and leave you a bigger gap then what the concrete settling away from the brick will.
Pour concrete against wall.
Concrete should never be poured up against steel siding and or trim.
Did you watch or four video you see the whole job get done from start to fi.
In this video we show you how to pour your basic 16 x 12 concrete slab.
If the wall exceeds four feet in height footings should be poured separately.
Create contraction joints every 4 6 feet.
Some contractors will put expansion joint material against the brick because the concrete will crack away from the brick.
We go over all the necessary steps for your concrete slab to come out perfect.
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 poured concrete wall has more mass or interlocking cement paste crystals to resist the cracking force.
The hollow block wall is depending solely on the strength of the thin mortar bed between each concrete block.
The best thing to do and it s the code in va is to put aluminum coil in between the wood and the concrete.
You will be fine pouring concrete up to the brick.
The addition of reinforcing steel to either wall system complicates the issue.
See below for more information on contraction joints.