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Gerard Roof

Tech Tuesday: Dissimilar Metals

Make sure you know about the effect of dissimilar metals and how to avoid corrosion on your Gerard roof!

Contact between or run-off from lead and /or copper onto Galvalume® will result in an accelerated corrosion of the Galvalume coating in the area of contact. The rate of corrosion increases with the severity of the environment and can result in premature failure. Although Gerard’s coating and acrylic primer will isolate the contact initially, the extended lifespan of the roof may be affected.


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