Q: The new corrugated metal roofing on our client’s garage leaks. The installer had driven the fasteners through the valleys and into the 2-by rafters. We’ve since been told that corrugated roofing should always be fastened through the ridges of the corrugation. Which method is correct?

A: Rob Haddock, a metal-roof consultant and director of the Metal Roof Advisory Group, responds: The culture of fastening through the ridge (crest) or through the valley of the metal-roof profile seems to vary in the continental U.S. from one place to the next, from one contractor to the next, and even from one manufacturer to the next. Many...

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