Tuscan Tile (Tesla's equivalant of clay tile) would need to cost less than $ 69,500, installed (or about $ 2,300 per 100 square feet), to beat its traditional counterpart; Smooth and Textured Tile (Tesla's equivalent to asphalt tile) would need to cost less than $ 73,500, installed (or about $ 2,450 per 100 square feet); Slate Tile would need to cost less than $ 98,500 (or about $ 3,300 per 100 square feet). (consumerreports.org)
The resulting 4.2 m loss in water equivalant thickness is significant, since North Cascade glaciers have an average thickness of 30 - 50 m. (nichols.edu)