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Waterproofing is the layer you never see in a pool, yet it decides whether the pool runs trouble free for a long time or starts leaking and shedding tiles soon. Tiles can be changed and pumps replaced, but failed waterproofing puts everything above it at risk. So any question about waterproofing cost should come with another: which system, and how will it be applied? This article explains why waterproofing matters, the systems used in pools, the factors behind cost and when full rewaterproofing is needed versus local treatment.
Why waterproofing is the most important layer
Concrete alone does not stop water. It has pores and hairline cracks, and tiles and grout are not a waterproof layer either. Waterproofing is the final barrier between pool water, the structure and the soil. When it fails:
- Water escapes, the level drops and the water bill rises.
- Water reaches the steel reinforcement, which rusts, expands and cracks the concrete.
- Water behind tiles weakens adhesive and tiles come loose.
- Water washes soil under and around the pool, creating voids and settlement.
- Damp can reach nearby walls or foundations.
In Riyadh, high heat and temperature swings keep the structure moving, so waterproofing must be flexible enough to follow that movement without cracking.
Waterproofing systems used in pools
Flexible cementitious coatings
Polymer modified cement applied in several coats. Excellent bond to concrete and ready for direct tiling, with enough flexibility for minor movement. Among the most common systems for tiled pools.
Liquid polymer membranes
Brushed or rolled liquids forming a seamless film. More flexible and well suited to complex areas around fittings and corners. The product must be rated for permanent immersion and tiling.
Sheet membranes
Rolls or sheets bonded to the surface for even thickness, but laps and joints need great care as potential weak points.
Crystalline products
React with concrete to block pores from within, usually as part of a complete system, especially where water pressure comes from outside.
The choice depends on structure and problem, not price. See the best waterproofing materials for Riyadh pools.
What affects waterproofing cost
- Total area: floor, walls, steps and benches, not just surface footprint.
- System type: each has different material cost and number of coats.
- Structure condition: cracks, honeycombing and weak areas must be treated first.
- Removing old finishes: old tiles and waterproofing add a significant item.
- Fittings and details: every opening and corner needs bands and reinforcement.
- Preparation: cleaning, levelling and priming for bond.
- Flood testing: filling the pool after waterproofing and before tiling to confirm no leaks.
Full rewaterproofing or local treatment?
Local treatment suits a leak from one defined point, such as around a fitting or a local crack, with sound waterproofing elsewhere. The area is opened, the cause treated and new waterproofing applied with generous overlap onto the old. Full rewaterproofing is needed when:
- Leaks come from several or unidentified sources.
- The pool is old and never had a complete system.
- Local repairs have been repeated and the leak returned.
- Tiles are hollow over wide areas because of water behind them.
- Structural cracks need repair.
Full work usually needs draining and complete finish removal, so it costs more, but it provides a clear fresh start.
Signs your pool needs rewaterproofing
- Ongoing water loss beyond normal evaporation.
- Damp or stains in surrounding decks or walls.
- Tiles loosening or sounding hollow in scattered areas.
- Rust stains on concrete or seeping through grout.
- Cracks in walls or floor.
- Leaks returning after past repairs.
Quality checklist for waterproofing work
- Engineering inspection defining cause and scope.
- A named system in the quote, rated for immersion and tiling.
- Cracks and weak areas treated before waterproofing.
- Special treatment of fittings and corners with bands and reinforcement.
- Coats and thickness per manufacturer guidance.
- Proper drying time between coats.
- Flood test before tiling.
- Written warranty on waterproofing.
YAM Pools selects the right system after engineering inspection, carries out supervised work with a flood test before tiling and provides a written warranty on waterproofing. We serve Riyadh and all Saudi cities.
Frequently asked questions
Is full waterproofing more expensive than local repair?
Per project, yes, as it covers the whole pool with draining and finish removal. It is the better value when problems are widespread or recurring.
How long does good waterproofing last?
It depends on the system, workmanship, water balance and maintenance. Properly applied waterproofing with regular care lasts a long time, and we state the written warranty in the quote.
Does the pool have to be fully drained?
For full rewaterproofing, yes. Local treatment of some fittings near the surface can be done by lowering the water.
What is a flood test?
Filling the pool after waterproofing and before tiling, then monitoring the level to confirm no leaks. Any defect is found while the waterproofing is exposed and easy to fix.
