Choosing tile for a submerged swimming pool is very different from choosing tile for a shower, backsplash or exterior wall. A pool finish remains continuously exposed to water, sanitizing chemicals, temperature changes and hydrostatic pressure. In outdoor pools, the assembly may also experience direct sunlight, thermal expansion and freeze-thaw cycling.
For most submerged pool waterlines and fully tiled pool interiors, my first recommendation is a porcelain mosaic that the manufacturer specifically approves for swimming pools and continuous immersion. Dense granite mosaics can also perform successfully, but they require more careful review of the particular stone, finish, water absorption, pool chemistry and installation system.
The word “porcelain” alone is not sufficient. Likewise, the fact that a natural stone is hard does not automatically make it suitable for permanent submersion. The tile, backing, adhesive, grout, waterproofing and movement-joint design must work as one complete system.
My First Choice for a Submerged Pool: Porcelain Mosaic
Porcelain mosaic is generally the most dependable starting point for submerged residential, hospitality and commercial swimming pools.
A properly selected porcelain mosaic offers several advantages:
Low water absorption
Strong resistance to pool chemicals
Consistent color and dimensions
Easier installation around curves, steps and complex pool geometry
Numerous grout joints that help the surface conform to shaped substrates
Lower maintenance than many natural stones
Suitability for both traditional chlorine and saltwater pools when approved by the manufacturer
DOMVS Surfaces’ Micro Mosaic Collection includes Italian porcelain mosaics specifically identified for swimming-pool applications. The collection is offered on 12-by-12-inch sheets with 4 mm pieces and includes colors such as Matt Black, Matt Grey, Matt Coffee, Matt Mud, Matt Sand and Matt White. The collection is designed for residential and commercial, interior and exterior, wet and dry applications.