Terra Cotta Restoration
Marion has extensive terracotta repair and restoration experience. This wide range of experience includes:
Removal of surface grime, black encrustations, surface and sub-surface salts (efflorescence and sub-florescence), and geological growth.
Cracks over ¼” in width where the unit has not completely fractured and is still securely anchored to the structure.
Hairline Crack Repair:
Fine cracks typically only surface and under ¼” in width.
Complete crack through the unit requiring removal, rejoining of the segments, and surface repair at the crack site, and then resetting in new bedding mortar.
Chemical stripping of non-original surface coatings.
Custom patching of missing or spalled areas.
Recreation of Lost Detail:
Patching of the missing area is then carved to match the original detail. The patch is then finished with custom matched glaze.
Repair of Glaze Crazing:
Custom colored dispersed lime injection is utilized to repair fine cracks in the glaze. This treatment is then coated with a topcoat to bind the glaze to prevent further crazing.
Custom colored materials are made to recoat faded or failed terra cotta glazes.
Replacement Unit Installation:
Techniques vary based upon the original construction of the units and building structure. Marion works closely with the terra cotta manufacturer to insure a successful fabrication and installation.
Marion repointing work is executed in accordance with the National Park Service, Technical Preservation Service’s Preservation Brief #7, “The Preservation of Historic Glazed Terra-Cotta” by de Teel Patterson Tiller. Marion works in partnership with our sister company U.S. Heritage Group, Inc. to develop custom patch material and coating.