Remnants of the Pittsburgh region's enormous glass industry are rapidly disappearing, which makes the three remaining Wightman Glass factory buildings in New Eagle, the small town north of Monongahela, a rare find. They lie between the former Pittsburgh, Virginia and Charleston Railroad (PVCRR) tracks and the Monongahela River. The largest brick building is an enormous gable-roofed structure with a gabled monitor at the ridgeline. Corbeling along the cornice of the monitor's gable end distinguishes a circular window vent, with three elongated rectangular windows below. A second brick, gable-roofed building has corbeling at the cornice line, gable ends, and chimney. The tiny office building looks like a train station, although lacking the characteristic deep overhanging eaves. Its hipped roof is broken by large double-windowed dormers. The first story has wide paired windows and a handsome central door with sidelights and transom facing the railroad tracks. Therm-o-Rock has been combining and packaging organic additives and mineral aggregates and powders here since 1948.