QUALITY CONTROL · WATERPROOFING

Waterproofing checklist for a new home: what to inspect before finishes

Finished modern interior representing areas protected by proper waterproofing — Most waterproofing defects become expensive after tiles, paint and joinery are completed.

Waterproofing is a hidden-work package, which makes inspection timing critical. Once tiles, screed, ceilings or landscaping cover the system, diagnosing leakage becomes more disruptive and expensive.

1. Toilets and wet areas

Check surface preparation, pipe penetrations, wall upturn height, corners and floor traps before protection screed and tiles. Conduct the specified pond test and record the result before closing the area.

2. Terrace and balcony drainage

Waterproofing should work together with slope. Confirm rainwater outlets, overflow provision, drain levels and termination details. A strong membrane cannot compensate for standing water caused by poor slope.

3. External walls and window junctions

Cracks, façade joints, sill details and window perimeter sealing can become leakage paths. Coordinate façade waterproofing with plaster, cladding and window installation rather than treating each trade separately.

4. Basements and retaining walls

Below-grade work requires special attention because repair access is difficult after backfilling. Confirm the designed system, protective layers, drainage arrangement and inspection before soil is returned.

5. Water tanks and utility areas

Inspect internal treatment, pipe sleeves, construction joints and water tightness. Avoid relying on finishing coatings as the only defence where structural or joint detailing is required.

6. Keep evidence

Approved product and method statement
Batch or material records where applicable
Before-and-after photographs
Pond or water-test record
Inspection sign-off before concealment
Warranty and maintenance information

7. Coordinate waterproofing with the construction sequence

Many failures happen when later trades puncture or damage finished treatment. Define who is responsible for protecting the system and who must approve any later drilling or fixing in treated areas.

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