Trees Hanging over Copper Roofs
Date: Summer 2013
Do crepe myrtle trees create a chemical reaction with copper? (I have a crepe myrtle tree over hanging a copper roof - the leaves, flowers and berries drop on the roof and my copper roof has large rust spots. The tree? Or some other chemical reaction? Acid rain?
Thanks for the question. I am unaware of a specific reaction of the crepe myrtle tree with copper. I will say that the decay of organic matter (berries, leaves, flowers) does create acids which can corrode the copper. If it were acid rain, then the entire roof would have been corroded, not just the sections exposed to the tree paraphernalia.
I hope this helps. Please let me know if you have more questions.
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Update: November 2011