The Comprehensive Comparison of Thermal and Physical-Mechanical Properties of the Recycled Rubber and Plastic Roofing Tiles versus Roofing Tiles Made with Different Traditional Materials

Table 3

Classification of concrete roofing tiles according to the coefficients of permeability to air (Swiss Standard SIA 262/1-E10).

Class	kT permeability (10^−16 m^2)	Permeability
PK5	>10	Very high
PK4	1.0–10	High
PK3	0.1–1.0	Moderate
PK2	0.01–0.1	Low
PK1	<0.01	Very low