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CU sheet metal thickness equivalent to AL

Mike Lamb

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When installing an open valley, use 16 oz. copper flashing at a

minimum (or its equivalent) over WinterGuard? Waterproofing

Shingle Underlayment (or its equivalent). Preformed ?W? style

valleys are preferred (Figures 16-11 and 16-12).

The aluminum used on this valley looks like typical .0145 coil stock. What is the equivalent AL to 16 oz. CU?

This is a Certainteed Grand Manor Shangle roof. There are so many problems on this job that the valley issues are just piling on. I am very aware of the underlayment issues. The builder is not going to be happy with what his roofers did and did not do.

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