Speweik Preservation

Historic Masonry Restoration Consultants


John Speweik, CSI is a historic masonry specialist for Speweik Preservation Consultants, Inc., an independent consulting and testing agency specializing in matching historic stone, brick and lime mortar based in Elgin, Illinois.

He is a fifth generation mason, from a family of masons, ca. 1870 Posen, Prussia. John has developed a vibrant passion for replicating historic masonry materials in both design and application using the building itself as his model. His reputation as an innovator and pioneer in lime mortars has prompted revolutionary changes to the masonry restoration industry in the past 20 years. John believes strongly that buildings have a voice and communicate clearly through visible patterns. He identifies these patterns and then interprets and translates the findings into workable treatment options for his clients.

His dream of one day traveling to England to meet other heritage stonemasons became a reality in 1997. John has made regular trips back to England since and has developed many friendships while completing academic courses and workshops on traditional masonry conservation. He has had the privilege of working on several castles with fellow Scottish stonemasons to gain personal insight into the challenges of lime work on vintage masonry walls and bring that knowledge back to American stone masons.

The goal of John’s work is to develop historic rehabilitation treatment recommendations and certified project specifications sensitive to the historic integrity of each specific building – supported by the actual installation of those recommendations into the facade masonry while establishing the workmanship quality standard for installation.

John Speweik has created a unique test panel certificate training program in support of this goal. The training incorporates “on-the-wall” skill demonstrations to evaluation worker proficiency to execute the specified project treatments. John has written many articles and publications on historic masonry and is a recognized authority on lime for use in masonry restoration and plaster applications. He is an active member of ASTM C12 and was instrumental in the development of ASTM C1713 Standard Specification for Mortars for the Repair of Historic Masonry recently approved and published in February 2010.

“The guiding principle of respect and honor in a true master craftsman are found not in his words, but on the wall, through the work of his hand.”     J. Speweik, March 2010