Average New Roof Cost. The average cost of a new roof is between $4,707 and $10,460 depending on the roof size and materials used. A 2,000 sqft. asphalt roof costs from $3,600 to $10,800 on average, while a metal roof costs between $8,000 to $24,000.

The answer is yes, you can lay new roof shingles over old ones. But before we get started, one thing must be clear: adding new roofing over old (sometimes called a "re-roof") is possible only with asphalt shingles (also called "composition shingles").

Before lumber companies began selling OSB, the standard choice for sheathing a roof with a 24-inch rafter spacing was 1/2-inch CDX plywood - the letters CDX indicate that it is construction-grade material intended for exterior applications.

Most experts agree that a typical roof will last between 20 and 25 years. It also depends on whether the old roof was removed and you only have one layer of shingles, and if it is properly ventilated.