“…There are several new NDT and semi-NDT methods on the market, different in sophistication and purpose. As the focus of this research is mainly on masonry structures or combined masonry and concrete/timber structures, the most important NDT methods for existing masonry structures can be summarized: visual inspection [19], rebound hammer [20,21], measurement of reinforcement location [22], stress wave transmission [23], ultrasonic velocity testing [24], sonic velocity testing [25,26], surface penetrating radar [25,27], infrared thermography [28], flatjack tests [29,30], damage identification using impact vibrations [31], acoustic emission [32], etc. The basic advantages and disadvantages of the mentioned methods are described in Table 1.…”