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 Steel shingle metal roof: Installation can cost at least $600 per square foot for the shingles. 2  Or run $750 per square foot for a standing seam steel roof. 3  Aluminum metal roof: Can cost anywhere between $700 and $1,200 per square foot.4  Copper and zinc metal roofs: Averages $800 to $1,100 to purchase the materials. Aluminum metal roof: Can cost anywhere between $700 and $1,200 per square foot. 2  Copper and zinc metal roofs: Averages $800 to $1,100 to purchase the materials. 3  Installation costs around $700 to $1,200 per square foot.