Influence of freezing test methods, composition and microstructure on frost durability assessment of clay roofing tiles

► This paper compares the standard methods C and E (new) to predict the frost resistance of clay tiles. ► It deals with the effect of clay, microstructure and manufacturing on the frost durability. ► Microstructure was studied by DRX, FRX and mercury porosimetry. ► It leads on clay characterisation and industrial process control to improve frost durability.