I really like the industrial look of concrete casting, and am thinking of having a single wall in the entrance hall with a floating staircase.  Is it a case of adding some vertical rebar from the slab and building a strong plywood form.  Just concerned that there is no leakage of bleed water, otherwise, it can look terrible.

 

Any other options?

I do quite a few jobs in clay works 

The concrete look is all the rage amongst the designers 

Not cheap but cheaper than casting a whole wall

14 minutes ago, nod said:

I do quite a few jobs in clay works 

The concrete look is all the rage amongst the designers 

Not cheap but cheaper than casting a whole wall

Do you have a link.  I briefly dabbled in casting concrete clocks / furniture using GFRC, so could always manufacture large 20mm thick wall panels, but would prefer the look of a cast wall.