Sliding layer under Lecablock?

[maxiq]

I had to tear down part of the basement wall (souterrain) because the backfill had pushed it in about a decimeter. It is a wall from 1947 that consisted of an outer layer of 5 cm concrete and a similar inner layer with 20 cm of charcoal insulation in between. Now I am going to build up 3 m wide and 2 meters high with 25 cm Leca blocks in the first step, and then make the corner and about a meter on the other wall in the second step.
According to Weber's instructions, "A sliding layer of foundation paper or sheet metal is placed under the masonry in, for example, basement exterior walls for houses and garages," but that means the new wall won't be attached to the slab. Isn't there a risk that the same thing will happen again when I backfill? Or will the reinforcement hold it in place?

 

[Anonymiserad 122206]

That worried me too on a basement wall, so I drilled down rebar through the first layer of Leca, into the slab, and glued it with injection compound. Probably a lot of work and money down the drain.

 

[maxiq]

That also worried me on a basement wall, so I drilled down rebar through the first row of Leca, into the slab, and glued it with injection compound. Probably a lot of work and money wasted.

I'm considering a compromise where I drill down some bars into the slab but don't attach them to the Leca.

 

[maxiq]

The problem was solved after a conversation with the hardware store, which was on the same page as I was. I drilled rebar into the slab in the large holes of the lowest lecablock, so they (hopefully) resist external forces.