It's onto floorboards. I don't know enough about types of screed but is there one flexible enough for that?
My bad for some reason I'd got it into my head that the lower surface was the concrete.
Easily done without seeing the situation. I was keen to discover a flexible screed that would do it!
@Bobbo started
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It's onto floorboards. I don't know enough about types of screed but is there one flexible enough for that?