The South African Oxygen Permeability Index test (OPI) and Swiss Torrent air permeability test (TPT) are well-established methods used for gas permeability evaluations of concrete infrastructure. The methods relate to the durability of concrete and are used for concrete mix design, quality control and conformity assessment. The recently published fib Model Code 2020 recognizes both methods for service life design and quality control of concrete structures. The main difference between the methods is that the OPI test is typically done on core samples removed from the actual structure or precast element, or a test panel representing the structure / element, and the TPT test is performed directly on the structure. As such, the TPT test is more practical in terms of testing procedures, while the OPI test is able to measure permeability properties independent of environmental influences on site. Comprehensive laboratory experiments have shown the compatibility of the two methods as a combined approach for enhancing the durability assessment of the concrete cover.