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How Much Roofing Material Do I Need? Shingles, Bundles & Cost Guide

How Much Roofing Material Do I Need? Shingles, Bundles & Cost Guide A roofing "square" covers 100 square feet of roof area. Most asphalt shingle roofs require 3 bundles per square, so a 2,000-square-foot roof needs roughly 60 bundles (20 squares). You must also factor in roof pitch, waste from hip and valley cuts, and starter and ridge cap shingles to arrive at an accurate material order. A 1,800-square-foot workshop re-roof shows the gap clearly: the flat area measures 18 squares, but the material order comes to 20 squares because a steep 8/12 pitch adds nearly 12% to the actual surface area. Even with that cushion, hip-and-valley waste from an L-shaped footprint can consume an extra 2 squares worth of shingles -- pushing the total to 66 bundles and $4,150 for architectural shingles, underlayment, and ridge vent combined. That gap between footprint and final order shows how much roof geometry...