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How do you make a curb when converting a balcony into a patio?

The terrace was once planned as a balcony and consists of a concrete slab with exposed slabs of filler on it. The edge is not concreted as it should be, but has a bolted metal strip behind which the railing is actually supposed to be. I am attaching a picture of this.

I would like to lay slabs of natural stone. That in itself isn't a problem – but how do you make the edge? I think that flexible metal strip has to go, doesn't it? Because no grout will hold there – one step and the cracks are there.

So, remove the metal sheet, dig it up, lay the natural stone slabs vertically on the gravel/cement pad as a curbstone? Or what else?

• terrace
• curb