over old roof Articles

Going Over Old Roofs (Roofing Weight)

December 15, 2009

Q: “I hear differing opinions on installing metal over old shingles. Can the metal be too much roofing weight on a home?” A: Most metal roofs weigh from 40 pounds per square (aluminum) up to maybe 145 (for stone coated steel). A square is 100 square feet. Asphalt shingles on the other hand weigh from… ( read more )