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Swimming Pool Waterproofing

Pool waterproofing applies a watertight system to the pool's concrete shell before tiling, usually flexible cementitious or crystalline waterproofing with reinforced corners and pipe penetrations, followed by a fill test. For existing pools, repair starts by locating the leak source (shell, pipes or fittings).

Waterproofing an open concrete tank with membrane rolls and liquid layers
Waterproofing an open concrete tank with membrane rolls and liquid layers — Illustrative image

When do you need swimming pool waterproofing?

  • Abnormal drop in pool level
  • Damp in adjacent rooms
  • Loose tiles

Early warning signs

  • Level drops more than normal evaporation
  • Wet ground around the pool

Materials and systems we use

Material / systemUse and advantages
Flexible cementitious waterproofingFor the shell before tiling.
Crystalline waterproofingSeals concrete pores.
Bonding agents and sealants for fittingsAround lights, drains and pipe inlets.

How Azl carries out the work

  1. 1Bucket test to separate evaporation from leakage
  2. 2Inspect pipes and fittings
  3. 3Treat the shell and corners
  4. 4Apply two coats of waterproofing
  5. 5Fill test before tiling

Comparing the available systems

SystemFunctionStrengthNeedsEst. SAR/m²
Crystalline cementitiousIntegral waterproofingWorks against negative pressure, seals fine cracksMoist curing and sound concreteWithin tank pricing 60–120
EpoxyLining and floor protectionHard, chemical-resistant, easy to cleanDry concrete; potable-water certified product for tanks35–120
Spray polyureaWaterproof + mechanical/chemical protectionCures in seconds, highly flexibleSpecialist rigs and precise surface prep70–160

Indicative ranges before VAT. A system's real life depends on the product, workmanship and maintenance, so we state it in the written quote and warranty rather than a generic table.

Warranty and compliance

You receive a written warranty whose period depends on the insulation type and surface condition, with a handover report documenting materials and tests (flood, adhesion, thickness).

Swimming Pool Waterproofing by city

Different technical recommendations for each city based on climate, groundwater and soil.

Swimming Pool Waterproofing: frequently asked questions

How do I know if pool water loss is evaporation or a leak?

The bucket test: place a filled bucket on the pool step so its water level matches the pool's, then compare the drop in both after a day. If the pool drops noticeably more, there is a leak.

Related services

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