General guidance only — all construction work must be overseen by a supervising engineer This handbook is compiled from standards and laws with every source cited, andis being reviewed for certification by engineers Use it to know what to look at, what to ask and what evidence to request on site It is not an engineering determination and can't replace an engineer · Terms of use · Limitations of the handbook

Walls and architectural work

Waterproofing bathrooms, balconies and roof decks

Page code P16 · 74 inspection criteria · 8 illustrations

Of all twenty-five stages of building a house, this is the one where the cost of a mistake jumps the most. A leak before tiling is fixed by re-applying waterproofing in that spot, takes a few days, and nobody loses face. A leak after tiling is fixed by rip…

This page contains
Hold point — and the sentence you must say from the day you sign the contract
Floor fall — the only figure on this page that is law
Bathrooms have nine legal requirements, not one
Before applying waterproofing — if the area isn't ready, even the best waterproofing loses
Pipe sleeves — the mechanical reason leaks keep recurring around pipes
Five spots where waterproofing is often missing — all visible to the eye
Four items the supervision manual says to inspect — and the one it says to photograph
Flood testing — how to do it and what to look for
Balconies and roof decks — unlike bathrooms, they face real sun and rain

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