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TOPIC: Rust

Rust preventative edge treatment at cut location

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How is corrosion prevented from developing on the edges of a cut, where a metal galvalume panel is cut for installing a vent or skylight?
Guest User

11/1/2005
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It is important to cut galvalume and galvanized with a shearing action rather than with a saw cut. By cutting it with a shearing action, the protective zinc and aluminum coating on the steel will wipe over the raw edge and provide corrosion protection. If someone ever wishes to, they can certainly apply a rust inhibiting paint to the cut edges as well. Todd Miller
Todd Miller
Isaiah Industries, Inc.

11/1/2005
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Hi! Todd, Would you comment the criteria of choosing thickness of zinc coating regarding to the galvanized steel base thichness. the application is for enclosure sitting next to sea shore. The base metal thicknesses applied are from 1.0mm to 3.0mm. Best regards, TF.
Guest User

9/9/2009
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I would not use anything less than G90. Greater than G90 would be nice but probably hard to source. Todd Miller
Todd Miller
Isaiah Industries, Inc.

9/9/2009
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Todd, Thanks a lot for your advice. You are right, it is quite difficult to source G90 or above, especially in China. Best regards, Fai.
Guest User

9/9/2009
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All Best. Todd Miller
Todd Miller
Isaiah Industries, Inc.

9/12/2009
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