Hi Andy
I can't give an exact answer, but just wanted to point out that 300kg is not that much weight, i mean thats basically x4 average build people.
If x4 people stood all next to each other on your 1st floor and stood there for a year or more (funny i know, but use the example!) would you worry about them falling through the floor?
I think you are right to ask, no point worrying about it, you obviously want some peace of mind.
Are peeps with me in this, in thinking 300kg is not an issue?
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