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While this list isn't exhaustive, it will highlight some common mistakes that roofers make when they are installing a metal roof. These mistakes don't always point to intentional negligence, but they are things that should and likely would be considered by an experienced metal roof installer.
#1. Installing a metal roof over shingles without an underlayment
The question of installing a metal roof over an existing shingle roof is perhaps one of the most commonly asked questions from consumers. A metal roof can absolutely be installed over an existing asphalt shingle roof but an underlayment or other barrier (i.e., lathing boards) should always be used.
Why?