In this article
Many villa owners think of pool tiles as decoration, but tiles and the grout between them are the first layer that faces the water. Once that layer weakens, water starts working its way behind it, reaching the render and eventually the waterproofing. This guide explains how tile leaks actually happen, how to tell them apart from pipe or shell leaks, and how to repair them properly so the problem does not return a season later.
How do tiles become a leak source?
The tile itself rarely lets water through. The weak points are around it and behind it.
- Worn grout eroded by constant chlorine, brushing and the swing between day and night water temperatures, leaving fine gaps.
- Weak adhesive, especially ordinary products not designed for submerged use, so tiles debond and leave a void behind.
- Cracked tiles from impact, movement in the concrete or strong thermal expansion in summer.
- Neglected movement joints at the waterline and corners, filled with rigid material instead of a flexible sealant.
- Cut edges around fittings such as lights, return jets and skimmers, which are harder to set precisely.
In Riyadh's hot, dry climate this expansion and contraction is more pronounced, particularly at the waterline where tiles are exposed to sun and air rather than staying submerged.
Signs the leak is coming from the tiles
- A hollow sound when you tap a tile lightly with a wooden handle, meaning it has lost contact with the surface.
- Crumbling or stained grout in one area more than others, or dark lines showing constant moisture.
- Raised or tilted tiles, or tiles that have fallen off and left a bare patch.
- Damp patches or white efflorescence on the outer wall or the deck next to a specific spot.
- The level stops dropping at a fixed line, because water escapes until it falls below the crack.
Tile leak or pipe and shell leak?
| Indicator | Tile leak | Pipe or shell leak |
|---|---|---|
| Pump on or off | Usually no change | Can change noticeably |
| Where the damage shows | Around a specific tiled area | Spread out or away from visible damage |
| Level behaviour | Stops at the crack line | May keep dropping to the floor or pipe level |
| Visual check | Loose tiles or broken grout | Tiles look intact |
If you are not yet sure you have a leak at all, start with our guide on evaporation versus leaking.
The right repair sequence
- Map the damaged area by tapping each tile and marking hollow or cracked ones.
- Lower the water just enough to expose the area, or plan a controlled drain for deeper zones.
- Remove damaged tiles and grout carefully, extending slightly until you reach firmly bonded tiles.
- Check the layer beneath. Weak render or damaged waterproofing must be fixed first, not covered.
- Apply local waterproofing designed for submerged areas, overlapping the sound membrane around it.
- Re-set with pool-rated adhesive, with full coverage and no air pockets.
- Use chlorine-resistant grout such as epoxy, keeping movement joints flexible.
- Allow proper curing as the materials require before refilling, then monitor the level.
Spot repair or full retiling?
A spot repair suits damage limited to one or two areas when the rest of the tiling is firm. If hollow tiles are spread across several walls, grout is failing throughout, or the original tile is no longer available, full retiling gives a uniform result and avoids a chain of patch jobs. Laying new tiles over old ones to save time hides the problem rather than solving it. Learn more on our retiling service page.
Choosing tiles and materials that reduce repeat leaks
- Pool-rated tiles with low water absorption, whether ceramic, porcelain or glass mosaic.
- Slip-resistant finishes on steps, shallow areas and the surrounding deck.
- Adhesive and grout from one compatible system suitable for underwater use.
- Medium or light colours at the waterline to absorb less summer heat.
- Careful detailing around fittings with neatly cut pieces and flexible sealant.
Good materials are only half the job. Application and surface temperature matter too, so summer work is best done in cooler hours to stop products drying before they bond.
When to call a specialist, plus a checklist
Ask for a professional inspection if the level drops visibly from day to day, you see damp outside the pool, or several tiles fall off in a short time. YAM Pools inspects on site, locates the source before any breaking, and provides a written quotation listing the area and materials, with a written warranty on workmanship and waterproofing. We serve Riyadh and all other cities in Saudi Arabia.
- Tap the tiles and mark hollow ones.
- Watch whether the level stops at a fixed line.
- Do not regrout from the surface before finding the source.
- Repair waterproofing under the tiles before re-setting.
- Use pool-rated adhesive and grout.
Frequently asked questions
How do I know the tiles, not the shell, are leaking?
Hollow-sounding tiles or crumbling grout in one area, plus a level that stops at a fixed line, point strongly to the tiles. An on-site test confirms it, because some pipe leaks show their effects in the tiling.
Can pool tiles be repaired without fully draining?
Often yes. Areas near the waterline only need the level lowered, while deeper areas need a planned drain.
Will regrouting from the surface stop the leak?
Usually not, because water has already reached behind the tiles. Surface grouting hides the issue for a while, and the proper fix is removing the area and treating what lies beneath.
What grout is best for pool tiles?
Grout rated for submerged use and resistant to chlorine, such as epoxy, is a common choice. It must match the adhesive system and be applied correctly.
