My builder has just poured the foundations (600mm wide trench) for my kitchen extension but I have notice that the structural engineers drawings show that in one area where a vertical steel beam is to be located the concrete should be 1000mm wide. I was just wondering how you would make a foundation bigger. I am guessing that it would need to be keyed into the other foundation in some way?
Cheers
Not necessarily..probably the edges are pretty rough and will key enough..
Most stress on foundations is downwards, after all.
Ask your structural engineer. If you agree something with the builder without first consulting your structural engineer, you will be personally responsible for any problem that occurs in the future.
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