Carina M. Stolz, Andrea da R. Rysdyk, Mayara Amario, Mohammad K. Najjar, Elaine G. Vazquez and Assed N. Haddad The durability of mortar coatings is directly linked to their permeability. Crystallization additives have the potential to modify the pore structure and connectivity within the mortar, thereby improving its permeability. These additives serve the dual function of preventing water ingress while allowing water vapor permeability, which is crucial to promote moisture elimination in mortars.