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The characteristics and appearance of mortar joints are just as important as the stone masonry itself. Deteriorated mortar joints don’t only affect the look of the building but are also the most frequent cause of water infiltration and damage to the structural integrity. Mortar joints act as the “glue” that holds masonry units (bricks, stones, or blocks) together. Strong and properly maintained mortar joints distribute the load evenly across the masonry, providing stability and preventing the structure from collapsing.

Masonry mortar joints exposed to weather affected by heavy rain, or leaking gutters are more than likely in need of attention. Repointing is the refilling of the outer part of the joints where the previous mortar has weathered away or has been removed because it is unsuitable. Repointing mortar joints prevents rainwater from finding its way into the core of the wall or to the inside face of the building.

Healthy mortar joints can contribute to the insulation properties of a wall. Well-maintained joints can help reduce heat transfer and energy loss, making buildings more energy efficient. 208 Newbury Street in Boston, MA is a perfect example of a project with mortar joints that needed special attention from ESI Waterproofing and Masonry.

ESI’s scope of work for 208 Newbury Street required cutting and repointing of the mortar joints, followed by delicately cleaning the limestone surface to give this building an eyepopping appearance!