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 installation price of a standing seam metal roof: $1000-1200 per square (100 sq. ft.) of roof area on a 1-story, walkable gable roof, including tear-off, breathable synthetic underlayment such as GAF DeckArmor, clips+screws, Z-flashing, ridge-vent and snow-guards above doors (walkways) and used garage doors.hile $320 / square may be a bit high for some parts of the country, here in Boston and most of New England, some legit roofers wonât touch a roof for less than $400 per square and going average is $350 for walkable 1 layer tear-off, with new 30-year architectural.