Due to the lack of correlation between the lab test result with the testing procedures commonly practiced in the industry and the water-tightness performance on a real building, there is an urgent need for developing better testing methods and procedures (Ref. 1). It is believed that the durability of watertightness performance must be evaluated by new test methods and procedures. Ting Wall Inc. took the lead to pioneer the development of new test methods and procedures by subjecting TingWall mock-ups to unusual durability tests in China, Taiwan, and USA to prove out the high tolerance to many structural movement cycles in all directions without causing water leakage problem (Ref. 2). The unusual test results can be attributed to two unique features of TingWall, namely, freedom to move and well defined design principle of eliminating critical seal by completely separating air seal from water seal (known as Airloop Principle). With intentionally damaging air sealing functions during the tests, the Airloop Principle for eliminating water leakage problem has been adequately proved to be valid. For a conventional system, a change of design feature will cause a change in critical seal locations with different durability and tolerance concerns, therefore, job specific mock-up test is commonly required. For TingWall, the watertightness performance can be ensured as long as Airloop Principle is implemented in the design (can be judged in the detail drawings) and the design features can vary greatly to include the commonly known separate systems of curtain wall, window wall, ribbon window, and punched-out window. In summary, TingWall is a test proven system (Airloop System) with many variations encompassing curtain wall, window wall, ribbon window, and punched-out window.

No test is better than real buildings tested by the nature. The completed TingWall buildings in Taiwan and Japan have been severely tested by many typhoons and earthquakes. The completed TingWall buildings in USA have been tested by many years of weather cycles including the IBM renovation project in severe cold region. Many TingWall users responded very positively (Ref. 3).