_{We were engaged to restore and waterproof an existingrooftop swimming pool located at top of a mid-rise residential tower. Overtime, the pool had developed multiple leakage points, causing dampness andwater stains on the ceilings of the occupied floors below. Our scope includedfull removal of the old finishes, structural crack repair, and the applicationof a new, high-performance waterproofing system using CementitiousWaterproofing Solutions, Hydraulic Resin & Crystalline Injections, andSpray-Applied Polyurea Protective Coatings.}

Site Condition and Project Considerations

• Widespread tile delamination and visible efflorescence on pool surfaces

• Active water seepage at construction joints and plumbing penetrations

• Presence of shrinkage cracks in the concrete substrate

• Height and accessibility constraints due to the rooftop location

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Solution Implementation

‍1. Removal & Surface Preparation

• Stripped all existing tiles, mortar bedding, and previously applied waterproofing layers

• Mechanically prepared the concrete surface by grinding and scarifying to expose a clean substrate

• Mapped and marked all visible cracks and suspected leakage zones

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2. Crack & Joint Injection

• Used Hydraulic Resin & Crystalline Injection to seal shrinkage cracks and cold joints

• Resin grout was injected under low pressure, forming an internal waterproof barrier

• Special attention was given to joints around inlets, drains, and pipe penetrations

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3. Surface Protection – Cementitious Waterproofing

• Applied a flexible, two-component cementitious waterproofing slurry across all pool surfaces

• Rounded fillets were added at floor-wall intersections for improved stress management

• This layer served both as a waterproofing barrier and a leveling layer

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4. Final Coating – Spray-Applied Polyurea

• Applied a 2mm-thick, seamless polyurea protective coating over the cementitious layer

• The coating offered excellent chemical resistance, crack-bridging capacity, and UV stability

• Overflow channels and edge detailing were treated as part of a continuous membrane system

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5. Testing & Delivery

• A 72-hour hydrostatic test was conducted, confirming no leakage

• Final tiling and finishing were completed using compatible adhesives over the polyurea membrane

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Summary and Outcome‍

Systems Applied:

Hydraulic Resin & Crystalline Injections, Cementitious Waterproofing Solutions and Spray-Applied Polyurea Protective Coatings

The project was completed on schedule, and the waterproofing system performed successfully under full water load. No leakage was observed post-installation, and the pool was handed over ready for long-term use with greatly improved performance and durability.

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