The detrimental effects of salt in masonry structures manifest across two distinct levels: (i) impacting structural elements and (ii) influencing ornamental elements. The presence of salt in the material’s body (even a small amount) can significantly alter the hygric properties of the porous building materials. The presented paper focuses on the hygric properties of a commonly used granite masonry material from the Northern region of Portugal, particularly focusing on its response to the presence of sodium chloride (NaCl) salt. The evaluated properties include results from different experimental methods, including vacuum saturation tests, capillary absorption tests, and cup methods. Additionally, the ultrasonic pulse velocity (UPV) tests were also conducted on granite samples under different conditions (dry state, saturated with pure water, and saturated with a salt solution). Anisotropy in the vapor moisture movement within granite samples was evaluated along perpendicular and parallel directions concerning the rift plane. Results indicated that vapor moisture movement was more restricted through the direction perpendicular to the rift plane in comparison to the parallel direction. The formation of salt crystals within the pore network significantly influenced open porosity and vapor permeability, emphasizing the impact of salt attack on granite masonry. These findings contribute to a better understanding of the influences of salt on granite masonry structures.