Membrane heights and junctions
Shower walls are waterproofed to at least 1800 mm (or 50 mm above the rose if higher), with 40 mm each side of wall junctions. source
Ask: Does your waterproofer's scope meet the NCC heights?
Plan · Stage 5 of 10 · 2 decisions
Decide before waterproofing
Before the membrane goes on. Membrane heights and details. Can't be redone once tiled.
Copies the decisions shown, with a prompt, to paste into ChatGPT, Claude or Gemini.
Puddle flanges at every waste, and the niche and hob details
These are the leak points, and they are buried once tiled.
Ask: Is every waste flanged, and is the niche sill falling back into the shower?
← Set-out and screed Linings →
Prompts, not rules. Most choices can wait; these can't, because a later trade builds to them. Code items cite their source; states adopt parts of the NCC differently, so check yours. Your builder, trades, certifier and each product's install sheet decide. Download the list (JSON, CC BY 4.0).