Mission San Josť y San Miguel de Aguayo

San Antonio Missions National Historical Park
San Antonio, Texas

Salts were then removed from the stone with a paper pulp poultice and immobilized with barium hydroxide, after which grout injections were made to reattach delaminating stone.

 

Prior to salt removal, the deteriorated stone required temporary consolidation and stabilization. Salts were then removed from the stone with a paper pulp poultice and immobilized with barium hydroxide, after which grout injections were made to reattach delaminating stone. Research revealed a 1950's application of a silicone cement-based water repellent that had darkened the stone surface; low pressure micro-abrasion safely removed this coating. After cleaning, fragile stone was reattached with ceramic pins and adhesive. Cement patches were removed and cracks and open losses were filled with a hydraulic lime mortar, colored to match the stone.

 

Back