What are the general conventional methods for exterior wall inspections?

1Tapping Method The tapping method is a method of experience-based judgment, typically using a small hammer as a detection tool. By analyzing the sound frequency and quality produced by tapping an object, one can determine the object's density and the presence of voids internally, and then estimate the likelihood of leakage. This method has few steps, but it is highly influenced by subjective factors and primarily relies on the experiential judgment of the inspector, resulting in high labor intensity and low efficiency.

2Visual Inspection Method The visual inspection method is a method of judgment based on experience, generally determining the condition of a structure based on personal visual observations. This method has few procedures and requires less human and material resources. However, it heavily relies on individual experience and is greatly influenced by subjective factors. Since the source of hollowing and leakage may not be identified, even with highly skilled technical personnel, it may not be possible to make a judgment.

3The infrared thermal imaging detection method uses an infrared thermal imager to explore the radiation of infrared energy from various parts of an object. It visually identifies the detection of discontinuities and defects on materials, structures, and their interfaces based on the distribution of temperature fields on the object's surface, and detects hollowed and leaking areas. It does not require scaffolding, prevents hazardous operations, and can quickly and non-contactingly inspect large areas for defects and leakage in building finishes.