gallonsquare feet. Other websites say a gallon will cover 400-450 square feet of smooth surface. If you've got a rough textured surface or surfaces which need 2 coats of paint, a gallon will cover about 200 square feet. The above answer may be a general rule of thumb.
Highly rated roofing contractors tell us that asphalt is the most affordable roofing option, followed by wood, tile, metal, and slate. Materials for a metal roof can cost up to $350 to $1,500 per 100 square feet. Angie's List members recently reported paying an average of $12,236 for a metal roof installation.
1 Metal roof installation costs around $5 to $15.00 per square foot or more. 2  This works out to a total metal roof price of roughly $7,500 to $22,500 for a 1,500 square foot roof. 3  It s possible in many cases to install a metal roof over old asphalt shingles.etal Roof. Metal roofing, typically made from coated aluminum or steel, costs approximately one-third more than asphalt shingle roofs, but with the price increase comes a number of benefits. First and foremost is the strength and durability of metal roofs, which are often guaranteed for 50 years or more.