Each tile is formed or pressed from a sheet of steel which has special properties to allow it to bend without cracking, but also be very strong when installed on a roof and subject to people walking on them. The steel sheet has a core of steel 0.38mm thick which is coated both sides with a Zinc/Aluminium alloy to protect it from corrosion. Our Al-Zinc steel is produced by Posco, a Korean steel plant which is a world leader in steel technology. The Zinc/Aluminium protective coating is applied by dipping the steel sheet in a hot, molten bath of Zinc/Aluminium alloy and is then carefully controlled to be approx. 0.025mm thick on each side, so total steel sheet thickness is +0.40mm before applying any stone chip coating in the Feroof plant. Al-Zinc is the name used by our steel supplier, Posco, and similar coated steel made by other steel suppliers is called by similar names such as Galvalume, Zincalume, Aluzinc, ZincAl, etc and all these are substantially the same type of steel. But note that Galvanised steel, ZAM and Galfan are not the same as our Al-Zinc and generally not as well suited for use in steel roof tiles.

Note: 1.Some roof tiles and other steel roofs are made using galvanized steel sheet which is a steel substrate protected only by a zinc coating. However, tests have conclusively shown that Al-Zinc coated steel of the same thickness lasts at least 6 times longer in severe marine (salty air) environment so our Feroof tiles will perform much better than any galvanized steel roofs made by competitors.

Note 2. AL-Zinc steel should not have any copper flashings above it from which water can flow. If water with copper salts runs onto the AL-Zinc roof it can cause the steel substrate to deteriorate.