The Waterstop market taxonomy by type differentiates products according to material composition and installation methodology, each influencing cost structure and performance envelope. PVC waterstops dominate with an estimated 45 % share, favored for their flexibility, ease of welding, and compatibility with standard concrete mixes; they are prevalent in residential and light‑commercial slabs where moderate chemical exposure is expected. Rubber waterstops, primarily EPDM, account for roughly 20 % of volume, offering superior elasticity and temperature resilience, which makes them suitable for commercial complexes and industrial floors subject to thermal cycling. Bentonite‑based waterstops contribute about 15 % and are distinguished by their swelling capability that seals micro‑cracks, a critical attribute for infrastructure tunnels and water‑retaining structures. Metal waterstops, typically stainless‑steel, occupy near 10 % of the market, delivering high mechanical strength for heavy‑load bridge decks and port facilities. The remaining 10 % comprises composite waterstops, which blend polymer cores with reinforcing fabrics to balance durability and cost. Collectively, these type categories shape the overall market size, with each material’s adoption rate reflected in the broader market taxonomy.