What are the general conventional methods for exterior wall inspections?

1. Knocking Method The knocking method is a method of material determination, usually involving the use of a small hammer as a testing tool. By analyzing the sound frequency and quality produced by knocking on an object, one can judge the object's density and internal voids, and then estimate the likelihood of leakage. This method has few steps but is greatly influenced by subjective factors, primarily relying on the experiential judgment of the tester, which is labor-intensive and low in efficiency.

2. Visual Inspection Method The visual inspection method is a method of judgment based on experience, generally determining the condition of the structure based on individual visual observations. This method has few procedures and requires less manpower and material resources. However, it primarily relies on personal experience and is greatly influenced by subjective factors. Since the source of hollowing and leakage may not be identified, even if the inspector has a high level of professional skills, it is not necessarily possible to make a judgment.

3. The infrared thermal imaging detection method utilizes an infrared thermal imager to explore the infrared radiation energy of various parts of an object. It directly displays the detection skills of discontinuities and defects on materials, structures, and their interfaces based on the thermal image formed by the distribution of the object's surface temperature field. It detects hollowed-out and leaking areas without the need for scaffolding, preventing risky operations and allowing for quick, non-contact, and large-area inspection of building finishes and leakage conditions.