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.
The total cost of a new metal roof, including materials and installation, can be around the following: 1  Basic interlocking steel shingles from $5,000 to $17,000. 2  Corrosion resistant steel sheets will cost about $12,000 to $22,000. 3  Aluminum metal roofing should be around $12,000 to $20,000.he total cost of a new metal roof, including materials and installation, can be around the following: 1  Basic interlocking steel shingles from $5,000 to $17,000. 2  Corrosion resistant steel sheets will cost about $12,000 to $22,000. 3  Aluminum metal roofing should be around $12,000 to $20,000.