When to waterproof during a renovation
Waterproofing is hidden but critical. Do it at the wrong time and you'll be hacking finished tiles to fix leaks.
- Waterproof after hacking and screeding, before tiling.
- Always test with a water ponding test before finishes go on.
- Wet areas — bathrooms, kitchen, yard, balcony — are non-negotiable.
The right moment
- Hacking and removal of old finishes
- Screeding to set falls toward drains
- Waterproofing membrane applied and cured
- Water ponding test (typically 24–48 hours)
- Tiling only after the test passes
Why timing is everything
Fixing a missed waterproofing layer after tiling means hacking finished surfaces — often 5–10× the original cost.
Frequently asked questions
Should waterproofing be done before or after tiling?
Before. The membrane goes on after screeding and must pass a ponding test before any tiles are laid.
What is a ponding test?
Water is held on the waterproofed area for 24–48 hours to confirm there are no leaks before finishes are applied.
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