Waterstops are mainly classified by material, purpose, and installation location
Classified by material
The most common type is rubber waterstop (such as natural rubber, chloroprene rubber, EPDM rubber), as well as plastic waterstop, steel plate waterstop, and composite waterstop with rubber and steel edges.
Classified by purpose
National standards are divided into Class B (for deformation joints), Class J (for construction joints), and Class S (for special aging resistance requirements).
Classified by installation location
The main types include the embedded type (pre-embedded inside the concrete), the externally attached type (attached to the outside of the structure), and the detachable type (replaceable later).