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 average cost of new residential metal roofs is $5.50 per square foot of roof material. This is the average price per square for metal roof of mid-grade quality. A low-grade roof costs around $1.40 per square foot on the average.Some materials of high-grade quality are around $12 per square foot.Thus, the cost of new metal roof would range anywhere from $3,400 to $28,000 for a total area of 2,500 square feet.Keep in mind, the cost of material installation or removal is not yet included in these figures.his is the average price per square for metal roof of mid-grade quality. A low-grade roof costs around $1.40 per square foot on the average. Some materials of high-grade quality are around $12 per square foot.