cracks in screed floor

6 Apr 2007
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United Kingdom
I have cracks across a newly laid screed floor. Should I bother to fill these before a wooden floor is laid over the top. The screed floor seems sound and fairly flat and even. How wide and deep does a crack have to be before I should worry about them? The floor is 5m x 10m and was done in one go.
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Hi, I have the same problem. I've laid several layers of screed on an uneven rough concrete floor and the top layer keeps cracking and lifting up.

I've lifted the cracked stuff, PVA'd the floor and relaid and it's happened again. It's only the top coat (and not the last) - any advice?

Should I try a latex based coat to avoid shrinkage - I'm wondering if switching the heating on (heating being a novelty in our shell of a house) has had an impact?

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