Stone Patching/Replacement

Deteriorated material is removed to a sound substrate, the surface is prepared for bonding, and a custom-matched composite mortar is built up in layers to restore the stone's original profile, color, and texture. The patch is tooled and finished to blend with the surrounding stone. Our trained crews perform this work on everything from simple sill repairs to detailed ornamental carving restoration.

Stone patching restores the surface profile and weathertight integrity of individual stone units but is not a structural repair to the wall system itself. If a stone unit in a load-bearing wall has lost enough section to compromise its structural capacity, full replacement with a structural-grade stone unit is required rather than a surface patch.

Yes — stone patching is a preferred preservation treatment on historic buildings because it retains the maximum amount of original material. Preservation standards generally favor repair over replacement whenever the stone retains enough integrity to support a durable patch. We perform stone patching on historic commercial buildings routinely, with approximately half of our work involving historic preservation.

Stone patching uses custom-matched composite repair mortars to rebuild lost or damaged sections of an existing stone unit without removing it from the wall. Stone replacement involves removing the failed unit entirely and installing a new piece of natural or fabricated stone matched to the original. Patching is less invasive and preserves original material; replacement is used when the stone has deteriorated beyond what patching can restore.

Consolidation strengthens existing deteriorated stone in place by penetrating and re-bonding its pore structure. Patching rebuilds lost stone profiles by applying a custom-matched composite repair mortar to fill voids, reconstruct missing sections, and restore the stone's original shape. These treatments are often used together — consolidation to stabilize the substrate, then patching to restore the profile.