When the expert errs: Crack from underneath in waterproof ­basement

Recourse of the building contractor to the expert?

A detached single-family home is to be provided with a waterproof basement. When calibrating the ground slab, which projects 1 m at the entrance and to the opposite patio, the building contractor makes a grave measuring mistake in that the slab is too large on both sides by 1m. The error becomes apparent before the walls are installed.

Following consultation with the structural engineer and the architect, the joint sealing metal, off by one meter, and the rising connecting bars were simply cut off, drilled into the new position and caulked. The sealing is now to be achieved by means of a...

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