How to attach and plumb masonry strings?

[proffsrik]

No, like this:

Aha, I probably already have loads of those at home. I assume the idea is to attach them so that what sticks out from the existing wall aligns properly to be embedded in the mortar between two blocks.

 

[proffsrik]

Of course, it should be reinforced, I understood it as the connection between the new wall and the existing wall he was asking about.

I probably managed to ask about both things in the same question.

Anyway, I'll go with rebar reinforcement and attachment with angle iron to connecting walls and ceiling, so I've probably done it properly and won't have to redo it.

 

[xLnT]

Aha, I probably have plenty of those at home already. I assume then that the idea is to attach them so that what sticks out from the existing wall is at the right height to be embedded in the mortar between two blocks.

Exactly so