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Copper Metal Coil & Sheet Metal

Architectural Copper

99% Copper Sheet

Copper coil and flat sheet from Metal Alliance is skillfully made in the USA with superior flatness and surface quality for peak performance. The inherent protective properties in copper metal roofing and architectural accents mean they will never rust or corrode while remaining virtually maintenance-free. Natural antimicrobial qualities resist fungus and bacteria growth leaving copper surfaces mold- and rot-free. And with its extremely high melting point, having a copper roof is also an excellent hedge against catching fire from a nearby structure since the material is non-combustible. 

All copper coil and sheet product from Metal Alliance meets ASTM B370 standards.


  • Unparalleled corrosion resistance

  • Timeless aesthetics

  • Fire, wind, freeze, thaw and hail resistant

  • Effortless to maintain

  • 100% natural and recyclable



Grades: H00

Thickness: 16oz. and 20oz.


  • Coil - 20” W, 24” W

  • Flat Sheets - 3’ x 10’

Warranties: Up to 50 years†


Copper Metal Coil & Sheet Metal Quick Reference

tFor limited warranty information, including detailed coverages and exclusions, contact a Metal Alliance representative, 


Copper – Architectural Metal for the Ages

Copper is the most beautiful and long-lasting of all roofing materials, gracing some of the most beautiful and historical structures around the globe. Dating back to 300 B.C., copper was the first metal material ever used for a metal roof. And for extreme temperatures and weather conditions, no other metal performs like it.


One of the most iconic structures in the world, The Statue of Liberty in New York Harbor is a great example of how copper stands up to Mother Nature. According to the Copper Development Association, when the National Park Service began planning for the landmark's centennial celebration, Lady Liberty's now bluish-green (or verdigris) copper skin was in near-perfect shape. After 100 years of standing up to biting sea winds, driving rain and sleet, and a hot beating sun, the original copper facade of the Statue of Liberty has not only become more captivating, but also remained virtually intact ─ a fitting testament to the timeless beauty and longevity of copper.


Courtesy of

The Timeless Beauty of Copper Metal Roofing

As it ages and is subjected to various environmental conditions, copper undergoes a chemical change, coating itself with a preservative. This gradual build-up creates an extremely tough oxide-sulfate patina that works as a barrier to shield the underlying copper surface and resist all types of corrosion. Depending on climate conditions such as humidity, moisture and acidity, a once striking shiny metallic orange roof will slowly begin to develop its protective patina. First transforming into rich browns and blacks, a copper roof will eventually take on a distinctive blue/green finish ─ a lovely reminder that this resilient metal is here to stay.



During the initial weeks of copper exposure, especially in areas with a humid atmosphere or frequent rainfall, radical color changes often take place. These sometimes shocking color variations result from the initial formation of copper oxides. These surface films are so thin that depending on how light is reflected, rainbow-hued "interference colors" can be seen. Iridescent pinks, oranges and reds, interspersed with brassy yellows, blues, greens and purples have been known to put on a stunning but albeit brief show.



As exposure continues, the natural oxide film builds in thickness and copper's patina evolves. Progressing from oxide film to sulfide film, and eventually to copper carbonate film, interference colors begin to fade and transition to relatively uniform russet brown shades. In industrial and seacoast atmospheres, the natural patina generally forms in five to seven years. In rural atmospheres, where the quantity of air-born sulfur dioxide is relatively low, patina formation may not reach a dominant stage for 10 to 14 years. In arid environments, the basic sulfate patina may never develop due to a lack of sufficient moisture. Similarly, exposed horizontal surfaces will develop patina more rapidly than sloping surfaces, which in turn will patina more rapidly than vertical surfaces. The critical variable, in all instances, is the dwell time of moisture on exposed copper surfaces.



In addition to its stunning blue/green finish, once a copper surface's patina has had an opportunity to form completely, it is highly resistant to all forms of atmospheric corrosion, significantly improving its durability and long service life, and earning its place as the longest-lasting of all roofing materials.

Copper's Natural Weathering Timeline

Copper Weathering Timeline

From its start as a bright and shiny reddish-bronze to the soft and graceful greenish/blues that evoke durability, the earth-connected hues of a copper roof will continue to radiate beauty for decades. 

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These three cupulas installed at different times atop agricultural fair buildings at the Eastern States Exposition fairgrounds in West Springfield, Massachusetts are a great example of the different hues copper's protective patina can take on over time.

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