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Cement does have potential for being corrosive to metal. However, I have rarely seen this be a problem. My guess is it is most likely to be a problem in areas that have catalysts present such as moisture between the two materials or salt. I have seen folks, where metal and masonry must connect, use a coating or a separator paper to keep the two apart. That is certainly not a bad safeguard.
Green or uncured cement/mortar is corrosive to Galvalume due to the high pH. Once cured it is not an issue. As for the lime wash, I would suggest doing the wash before you install the new roof. Again the high pH of the lime could leave stains on the Galvalume panels.
Is it true that Galvalume roofing cannot come into contact with mortar/concrete - I have a brick and stucco house that along with switching to a metal I roof would like to limewash the brick. I live in Southern New England
Read this discussion. May be this can help you here https://www.metalroofing.com/spirit/topic/7545/metal-roof-for-brick-gosloto results-and-stucco-house/. If yes then please mentioned me here.
I have tried it with yoga cement, no problem, it depends on the quality of the metal tile, I bought it from this company metal roofing suppliers
Cement can be corrosive to metal, especially when uncured. Using a coating or separator paper as a safeguard is recommended when metal and masonry connect. Uncured cement/mortar is corrosive to Galvalume due to its high pH, but once cured, it's not an issue. Apply the lime wash before installing the new roof to avoid potential stains on the Galvalume panels.
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