Answer:
(1) Classification of reasons for exterior wall leakage:
(1) Cracking and leakage caused by structural problems.
(2) Leaks caused by improper connections between exterior layers.
(3) Leaks caused by improper handling of exposed beam connections.
(4) Leaks caused by inaccurate filling—such as honeycomb, screw hole, and debris from template removal that were not properly removed, or poorly sealed window frames.
(5) The poor design of the wall caused the eight-shaped shear crack in the opening area of the aluminum windows and air-conditioning windows to leak water.
(6) Leaks caused by improper stitching.
(ii) Several types of leakage physics phenomena:
(1) The "kinetic energy" phenomenon caused by poorly designed window frames or roller shutters that causes water to leak, causing rainwater to splash into the interior.
(2) The "gravity" and "gradient" of rainwater caused by the poor slope of the window sill or exposed beam can accelerate the deterioration of the leakage.
(3) In cases where the exterior wall is filled with improper materials or the internal profile of the wall contains water-absorbing materials, the phenomenon of “stagnation” of rainwater can make the leakage difficult to detect in the short term.
(4) The stagnation of rainwater within the walls causes deterioration in the form of seepage and mold growth through the phenomenon of "pressure breaking of water vapor," resulting in a "multiplier effect."