What material is most commonly used for the walls of in-ground pools?

Concrete or fiberglass is the most commonly used material for the walls of in-ground pools because both of these materials provide exceptional durability and structural integrity. Concrete can be poured into various shapes and gives the pool a solid framework, allowing for a variety of designs. It also offers longevity and can withstand harsh environmental conditions. On the other hand, fiberglass pools are pre-manufactured and provide a smooth finish, ease of maintenance, and quick installation.

While other materials like vinyl and steel can be used, they do not match the overall durability and versatility that concrete and fiberglass offer. Vinyl liners, for instance, may need replacement over time and typically come with a shorter lifespan compared to concrete options. Steel walls, while strong, can be susceptible to corrosion and may not offer the same aesthetic or long-term performance as concrete or fiberglass. Wood is seldom used as it does not provide the necessary longevity and is prone to decay when constantly in contact with water.