Inspection of existing buildings by obtaining cores for the assessment of compressive strength and carbonation of concrete, impact measurements, in situ and laboratory determination of chloride content of concrete per depth (internal-external), determination of concrete moisture, reinforcement detection with rebar magnetic locator instrument, measurements of half-cell potential difference in steel, rebar sampling for steel class determination, determination of tensile strength of reinforcement-deformation, breakage-plasticity, determination of reinforcement corrosion products, determination of chemical composition of reinforcement bars.