A: A typical 3-tab asphalt shingle roof will last anywhere from 10 to 20 years. 3-tab shingles are an OK option for temperate climates, but they are not at all suitable for storm-prone areas.
Installing a Metal Roof Over 2 Layers of Shingles: What You Need to Know
Thinking about putting a metal roof over your existing shingles? Here’s what you need to know, from structural considerations to expert installation, to ensure a long-lasting and effective solution.