Some of the watertight members of exterior wall joints have a double-layered structure for redundancy, and gaskets, watertight rubber seals, are used for the inner watertight members. In recent years, new materials such as improved urethane are used for gaskets in addition to the conventional materials such as PVC, TPE, CR, EPDM and SR. In this study, we compared the durability of each gasket in a wet heat test. The results showed that there is no significant difference in performance. In the future, it is necessary to compare each material based on the parameter of construction performance.
