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Metal roofs generally can run from $120 to $900 per 100 square feet (one 10-foot by 10-foot area, or a “square” of material), while asphalt shingles will be between $100 and $200 per 100 square feet.
Metal shingles are also available in aluminum, zinc, and copper. So, it’s not just color, but texture that allows metal shingles to obtain a great diversity in product options. … Panels are usually 4 feet long and are often installed over existing roofing (i.e. metal shingles can be installed on top of asphalt shingles).
Lower Long-Term Cost – As we will discuss later, metal roofing is more expensive as a one-time cost. That being said, metal roofing is typically less expensive in the long-term because one metal roof (one lasts 60+ years) can easily outlast at least three asphalt shingle roofs (one lasts 15-20 years).
Metal roofs can be installed over your existing roof without tearing off shingles, provided local building codes allow it. … Or, installing the new metal roofing over furring strips (1 x 3s or similar) will raise the metal and provide a ventilating air pocket between layers.
It’s not a good idea to try and install shingles over metal roof panels. While it’s perfectly fine to install corrugated metal roofing over asphalt shingles, it wouldn’t be a good idea to install shingles over corrugated metal.