Metal Roofing Interstate Metals LLC Metal Panels

Metal Roofing Interstate Metals LLC Metal Panels

We are committed to producing the best metal panel possible. Our metal panels and trim are

made of Galvalume, not just Galvanized. We use the best paint covering possible for long

lasting appearance and protection. Quality of product makes a difference. We offer the

highest quality panel to ensure customer satisfaction.

AkzoNobel is the largest coatings manufacturer in the world and one of North Americas

leading manufacturers of industrial finishes. Headquartered in Columbus, OH; the Coil and

Extrusion Coatings division manufactures and markets coatings throughout North and South


CERAM-A-STAR 1050 is a silicone-protected polyester coil coating system designed

exclusively for the metal construction industry. It is the best and strongest silicone-modified

polyester coil coating system, offering superior color stability, chalk resistance, fade resistance

and gloss retention.

GALVALUME is a steel sheet coated with aluminum-zinc alloy by a continuous hot-dip

process. The nominal coating composition is 55% aluminum and 45% zinc. A small but

important addition of silicon is included in the coating alloy. It is added not to enhance the

corrosion performance, but to provide good coating adhesion to the steel substrate when the

product is roll-formed, drawn, or bent during fabrication.

GALVALUME steel sheet combines the excellent barrier corrosion protection of aluminum

with the galvanic protection of zinc. The result is a coating that lasts a long time, a coating that

provides cut-edge protection along sheared edges, and therefore, a coating that offers

excellent protection to steel sheet. Although there are a few exceptions, for most applications

in most types of environment, GALVALUME steel sheet is the preferred product when long-

term resistance to atmospheric corrosion is desired. It outlasts a galvanized coating of

comparable thickness, and offers cut-edge protection that is not available with aluminum-

coated sheet. This cut-edge protection means there is less rust-staining along sheared edges,

Metal Roofing Interstate Metals LLC Metal Panels

at scratches, and other imperfections in the coating. Also, since the coating is so resistant to

corrosion, it retains a very bright surface appearance when exposed to most atmospheres.

These attributes make GALVALUME steel sheet the preferred material for roofing.

The superior corrosion resistance of GALVALUME steel sheet is achieved by the presence

of microscopic zinc-rich and aluminum-rich areas within the coating. The aluminum-rich areas,

which corrode very slowly, provide the long-term durability while the zinc-rich areas, which

corrode preferentially, provide galvanic protection.

With GALVALUME, the aluminum and zinc act together to resist corrosion and provide

barrier protection on the sheet steel surface. This means it resists rust and resists cracking

and peeling from weather. It also resists cracking and peeling from the roll-forming process

when the sheet steel are formed into roofing and siding panels.

Both panels have been scribed and weathered for years. You will see the picture on the left

has much more extensive damage than the one on the right. You can clearly see the rust that

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