Does raft slab thickness vary across a single pour?

Yes, genuinely common — edge beams and areas under load-bearing walls are typically thickened compared to the main body of the slab, all specified precisely in your engineering drawings rather than poured at one uniform depth throughout.

This variation is a deliberate structural design, not an inconsistency, so it’s exactly what a correctly poured raft slab should look like when checked against the drawings.

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