Materials Considerations Regarding Rain Penetration in Historic Fired Clay Brick Masonry

Abstract

Moisture is a major source of damage in historic massive masonry. Therefore, control of moisture movement in masonry is instrumental in preserving the durability of masonry buildings. From research and practical experience, it is known that a series of causes may play a role regarding permeability problems in masonry. This article focuses on materials aspects regarding water penetration in historic fired clay masonry walls constructed with moderate-to-high absorption bricks and lime mortars; the occurrence and influence of parameters such as brick porosity, interface leakage, and mortar joint resistance are discussed. Subsequently, quantitative test results are given on the effects of these parameters on the leakage of massive walls of different thicknesses. The results of the investigations lead to a number of recommendations to be used in case of repair of historic massive masonry. Finally, attention is paid to the influence of workmanship on the permeability behavior of historic massive walls. Author Abstract LB - G10 LB - Ceramics, glass, and enamels LB - D5 LB - Building materials, processes of deterioration and treatment