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How deep were the new foundations and did building control look at them? The foundations for my single story extension were ridiculously over engineered, they were 1.2m deep and 60cm wide.
Did the concrete they used come pumped or did they mix it on site? Presumably it was pumped it so do you know what type they used? It was probably c25 but can you check that if you ordered it?
I know an inordinate amount about concrete as I had to recently sue a concrete company
princeperch
Yes - builder's still about. To add an extra frisson, they are friends of friends. Hopefully their insurance will help.
@Zebra_Cyclist - yes, a rear extension onto a 60's house. Main house is essentially a block of concrete with a brick skin - no movement at all on that. Extension is all blockwork, mostly rendered, but that wall is cementboard faced. It's 5 years old - had some initial settling cracks but this year these more significant ones. Thanks for the offer - we have an engineer booked in for a full report so will go from there.
@swedeee - yes- thanks!