Brick walls are typically durable, but they are not impervious to erosion. Brick and mortar expands and contracts as moisture enters and evaporates. Over time, the natural expansion and contraction of the brick and mortar caused by water infiltration causes erosion, or crumbling of the mortar.Click to see full answer. Furthermore, what causes brick to deteriorate? What Causes Bricks to Deteriorate Quality of the brick. Quality of the mortar. Quality of the installation. Water or frost penetration. Sandblasting cleaning actions. Settling/shifting of the structure. Repeated exposure to vibrations. Exposure to extreme temperatures. Furthermore, can crumbling bricks be repaired? Old brick walls can lose their mortar and crumble when wet. Surface repairs won’t fix the problem though they might improve the brick’s appearance in the short term. To deal with crumbling brick, address the underlying moisture problem and remove all damaged material. Subsequently, question is, can bricks rot? Structural Problems With unwanted moisture intrusion, masonry units and mortar can crack. When water enters brick, concrete, or natural stone, thermal expansion can cause the surface to peel, pop out, or flake off. Excessive moisture also results in wall rot, an extremely unsightly and unhealthy condition.How do you stop bricks from deteriorating? Use a “Breathable” Sealant This will only exacerbate the negative effects of water on brick –– since the sealant prevents moisture from escaping through the bricks’ porous surface. Therefore, always consult with a professional before applying brick sealant.