The 5th HMC 2019 will focus on research about aspects concerning technology and characterization of historic mortars, significance of the mortars and conservation and restoration issues in historic masonry structures and archaeological sites, historic plasters, design and preparation of preservation products, repair materials (mortars, renders, plasters and grouts) and test methods (for historic and repair mortars). The HMC 2019 is open to scientists, architects, restorers, conservators, historians, archaeologists, heritage professionals, companies and cultural stakeholders.