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CORTEN A606 Roofing & Siding Panels

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We are a recommended installer of Cor-Ten and other roll formed metal roofing and siding products in the Colorado High Country for Western States Metal Roofing, all information used by permission.

COR-TEN® is a trademarked name owned by U.S. Steel. COR-TEN® steel is becoming more popular by roll formed product end-users, especially in the High Rockies, or on rustic design new construction. Its unique look and naturally oxidizing finish make it especially desirable for many architectural projects. Weathering steel, best known under the trademark COR-TEN® steel, is a group of steel alloys which were developed to obviate the need for painting, and form a stable rust-like appearance if exposed to the weather for several years. Weathering steel has increased resistance to atmospheric corrosion when compared to other steels. COR-TEN® resists the corrosive effects of rain, snow, ice, fog, and other meteorological conditions by forming a coating of dark brown oxidation over the metal, which inhibits deeper penetration and negates the need for painting and costly rust-prevention maintenance over the years. In simple terms the steel is allowed to rust and that rust forms a protective coating that slows the rate of future corrosion.

COR-TEN® is not available on the open United States market. The comparable steel product is rated as steel in an A606-4 or an A588 finish but is not necessarily of US origin. If the product's origins cannot conclusively be traced to US Steel the product is almost certainly NOT COR-TEN®.

When someone needs COR-TEN® they are normally referring to A606 Type 4 or A588. If you want COR-TEN® this will be the best available option. Weathering steels, such as ASTM A588, A242, A606 and COR-TEN® exhibit superior corrosion resistance over regular carbon steel as a result of the development of a protective oxide film on the metals surface which slows down further corrosion.

The original COR-TEN® received the standard designation A 242 ("COR-TEN® A") from the ASTM International standards group. Newer ASTM grades are A 588 ("COR-TEN® B") and A606 for thin sheet. All alloys are in common production and use.

A606-4 and A588 steel arrives UNRUSTED and will rust with naturally exposure to the weather. This material will rust on its own if left exposed to the weather. Getting the material wet will increase the speed in which it will form the patina.

This protective coating essentially stops further corrosion and self seals the surface. Laboratory analysis of the rust film have shown that the alloying elements in the steel, particularly copper, chromium, and nickel produced insoluble compounds that clogged the pores at the rust/steel interface, thereby ending the regeneration, though it will never stop weathering completely. Rust runoff will likely stain the surrounding areas, such as concrete sidewalks. In general, do NOT use dissimilar metals with COR-TEN®. Galvanized, galvalume®, and zinc should NOT come into contact with COR-TEN®, although stainless steel is compatible with COR-TEN®. It is recommended to use a high temperature underlayment.

Lower Cost RUSTY 'N RUSTIC Alternatives are available:

Colors that replicate the look of weathered and both rusted and unrusted metal, with 2 finishes that look like Aged Galvanized.

  • Painted Rusted Roofing - AZ50 coil, all 24 gauge (except Antique Rustic 26 ga), Finish Cool-Tech 500 (Kynar500 / Hylar 5000): Painted panels that replicate the look of a real rusted roof, without the running rust stains. The appearance of oxidized metal without the running rust, with a 40 year finish warranty (COR-TEN and A606 have no finish warranty).

  • Prepainted Copper - Galvalume AZ50, Painted Metallic Finishes; HUGE cost savings compared to real copper. Painted coil has several different "weathered" Kynar/Hylar paint finishes to choose from. Most metallic painted finishes carry a 40 year paint warranty.

  • Prepainted Metal that looks like Weathered Galvanized Steel - Galvanized G-90, 24 gauge. REZIBOND or BONDERITE finish: NOT a painted finish, this is almost an acid etch or printed finish intended to look like traditional, weathered galvanized metal. VINTAGE Substrate - Galvanized G-90. PATINA, COOL ZACTIQUE GREY, GALV-TEN ROBUST Substrate - AZ50 Galvalume.

Every popular panel profile is available, precut seamless panels to the slope measurement, delivered via truck to the job site:

Coil and Flat Sheets, 7/8" Corrugated, 1/2" Corrugated, 16 inch Standing Seam, PBR Panel (classic rib), Western Rib (like roof channel steel), Rust Wall (flat panels), and Perforated A606 (for venting purposes).