Does a raft slab need different waterproofing in a bathroom wet area zone?

The same principle applies as any slab-on-ground system — the raft’s own vapour barrier stays consistent, while a separate wet-area waterproofing membrane is applied afterward specifically in bathroom zones.

This later-stage waterproofing is genuinely the same process regardless of which slab system sits beneath it.

Related Questions, Guides & Calculators