Avoid Common Mistakes That Cause Irreversible & Costly Damage To Your Building's Architectural Integrity In the first of a series of Preservation Primers developed to guide homeowners, contractors, architects, and anyone else interested in the preservation of our built history in their restoration and renovation projects involving historical buildings - Father/Daughter preservationist team Danielle Groshong-Keperling and Charles Groshong review the common, and devastating, mistakes made when working on older buildings.