Just to check, you mean on the left, or the top edge?
Wouldn't it be easier to dig soil rather than smash the concrete.
At some point we might be redoing the terrace, so I don't want to do too much work.
What zebra said... In the red box. It's actually not a massive job, think it will be easier than you think. The only thing or won't solve is the puddling in the center of the concrete.
@Gndlf started
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Just to check, you mean on the left, or the top edge?
Wouldn't it be easier to dig soil rather than smash the concrete.
At some point we might be redoing the terrace, so I don't want to do too much work.