Photo gallery

Williams with her daughter Anna Marie

Heilinger (center) with his son and grandchild at a dairy show

Heilinger prepares to inspect a slate roof system on a church in Marietta, Pa., in the late 1980s.

Heilinger's Allis-Chalmers collection

The Heilinger family

Heilinger and his family vacationing in Long Beach Island, N.J.

Heilinger with his wife, Jo, and their dog

The goal of a maintenance program should be to sustain a maintainable condition with the objective of maximizing a roof system's service life.

Photo courtesy of Clark Roofing Co., Broadview, Ill.

Open mortar joints will allow water to enter a roof system.

Photo courtesy of Clark Roofing Co., Broadview, Ill.