ZT® Alloy

The Proprietary Alloy That Makes Follansbee The Best Roof Money Can Buy

One steel roof is just like another...right? Not if one’s a Follansbee roof. Why? Because only Follansbee produces steel roofing materials coated with ZT Alloy.

ZT Alloy - a specially formulated combination of zinc and tin - is what makes a Follansbee roof last up to 20 times longer than a run-of-the-mill steel roof, especially in the harsh environments.  It’s also what gives a Follansbee roof its unique visual characteristics.

How Good Is ZT Alloy?

Steel roofing materials are tested for corrosion-resistance in a salt spray cabinet per ASTM B117 and also in a condensation chamber per ASTM D4585. Most roofing material manufacturers boast when exceeding 2,000 hours before their material begins to develop red rust, but Follansbee materials surpassed an astounding 22,000 hours with absolutely zero sign of red rust. These results are solid proof that a Follansbee roof is as nearly a permanent solution for commercial and residential roof in coastal settings as is available today.

Outstanding Performance and Looks

It’s not enough that Follansbee ZT Alloy outperform any other roofing material for corrosion resistance, it also must provide the aesthetic that architects expect from terne roofing materials. This is especially critical with TCS II, Follansbee’s unpainted, terne-coated, stainless material. TCS II weathers naturally in the environment to a beautiful cool gray patina.

What Makes ZT Alloy So Effective Compared To Traditional Galvanized Steel?

ZT Alloy applied to stainless steel (TCS II) or low carbon steel (Terne II & KlassicKolors) exhibits corrosive resistant properties which exceed that of traditional galvanized steel. This two phase metallic coating is electroprotective when exposed to corrosives including: oxygen, carbon dioxide, chlorides or other reducing agents. As a result, ZT Alloy inhibits corrosion of exposed metal anywhere in the vicinity of ZT Alloy. This is critical because minor discontinuities in the coating - either resulting from the coating process itself or created during fabrication or installation - will be protected against rust. Additionally, the zinc/tin protective layer, which forms on the coating surface in a corrosive environment, creates a corrosion barrier for the Alloy itself, further enhancing the overall protection of the steel substrate.