We put a new floor into an existing grain shed 3 years ago and due to shrinkage theres a gap about 3cm wide all the way around. We've tried putting cement into it but the grain bucket lifts it away once its become brittle. Any ideas of something better? Concrete isn't any option because the gap isn't big enough for it to bind together and a local concrete guy has had a look saying he'd need to cut away about 2ft for it to stand a chance and even then he wasn't keen.
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