Roof Square

A roof square is defined as a unit of measurement used in roofing that equals 100 square feet of roof surface area. A 2,000-square-foot roof is 20 squares. Roofing materials including shingles, underlayment, and ice and water shield are priced and packaged by the square. A bundle of architectural shingles typically covers one-third of a square (33.3 sq ft), so three bundles are needed per square. Roof squares are the standard unit for estimating material quantities and labor costs in the roofing industry.