- Q.Can copper flashing be used
with cedar shingles? I was told the natural oils in the
cedar can corrode the copper.
A.The soluble tannins
in cedar can cause corrosion of copper flashing,
and the textbooks discourage using copper with
cedar. However, I have seen dozens of roofs with a
combination of cedar shingles and copper flashings
where the flashing has lasted as long as the cedar
shingles. In most cases, flow lines or patterns had
been etched into the copper, but I have never found
one that has corroded through.