These stamped diamond-pattern metal shingles for residential and commercial roofing projects are corrosion resistant and durable, and can be installed over existing asphalt shingles, according to the maker. The watertight design includes a side lock, which permits them to be installed without soldering and that allows for thermal contraction and expansion. Deep cross crimps prevent water from being blown under the end laps. The company's architectural stainless steel is coated with its zinc-tin alloy that is reactive to oxygen in the atmosphere, forming an attractive gray surface oxide, officials said.

Follansbee Steel, Follansbee, WV 26037; (800) 624-6906; fax (304) 527-1269; www.follansbeeroofing.com.