How much area does a 5-gallon of roof coating cover?
One 5-gallon pail coats 500 square feet. To calculate how much you need, find sq/ft of surface to cover: Length X Width = area. For example, to cover 2000 sq. ft., divide by 500 sq/ft to equal 1 coat application: 2000 / 500 = 4 (5-gallon pails). For two coats, double that figure. See our How To Measure Your Roof guide.