Preservation Rule #1 is that the mortar should never be harder than the material to which it adheres. Mortar serves as the shock absorber so when a building breathes—as all should, the movement is absorbed. When repointing, determine the original ingredients of the mortar and duplicate it for a visual match and to ensure it remains an absorber.

Bricks are fired—whether in a kiln or baked in the sun, resulting in a harder surface than their interior. It is critical that this surface be retained as without it the softer interior can erode and the brick’s role in a wall can fail. When considering cleaning or repair, always use the gentlest method possible to protect the surface.

The Nile Theater recently underwent a mortar analysis in preparation for its façade restoration as part of the Downtown Colonnade Removal program. This historic Mesa building is a perfect example of how mortar and masonry must work together and do so successfully. Read the full report

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