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No idea of specifics. It was magic as far as I was concerned, but made me happy and the builder enjoyed the challenge. The room was completely stripped back to brick and tanked so it was starting from a blank canvas. The depth and width of the tiles was known so it was ‘just’ a matter of plastering the portion of wall that wasn’t being tiled to match, and giving it a nice crisp straight edge.
How was this achieved?
Understandable!