Shower compartments must have walls made of what type of material for a specified height?

Shower compartments are required to have walls made of smooth materials for a specified height to ensure hygiene and maintenance ease. Smooth surfaces do not harbor bacteria and mold as easily as rough or textured materials, which can have grooves and cavities that trap moisture and soap scum. In addition, smooth surfaces are simpler to clean and maintain, promoting sanitation and preventing the buildup of harmful pathogens.

Moreover, building codes and plumbing standards often dictate that materials used in wet areas like showers meet specific criteria for waterproofing and hygiene. Smooth materials typically fulfill these criteria better than the alternatives, ensuring the shower remains safe, functional, and easy to use over time.