The membrane is the only barrier between a shower and the frame behind it, and it is under tile within days of being applied.
Wet area failure is the most expensive thing to repair in a finished home, because getting back to the membrane means removing the tiling and often the lining.
Annotated findings from Waterproofing inspections on Donnybrook builds. Client addresses withheld.

1Bored piersOnce holes are bored and cages placed, ahead of any concrete
2Slab pre-pourThe day before the pour, with pods, steel and formwork still open
3FrameAfter frame and trusses are up and the roof is on, before sarking
4Lock-up (pre-plaster)Once roof, cladding and external doors are on, before plaster arrives
5FixingAfter mouldings, doors and joinery, before the painter
7Pre-handover (PCI)About a week ahead of your practical completion dateInstant online pricing, or talk to the booking team on 1300 471 805.
By handover it is under tile, and assessing it means removing that tile.
AS 3740 for waterproofing of domestic wet areas, together with the NCC.
No. Flood testing is intrusive and sits with the waterproofer, not with us.
In Victoria the two are usually combined as fixing including waterproofing, and we can attend for either.
Tell us, because the value drops sharply once tile is down.
The waterproofer, before tiling. Cheap now, expensive afterwards.