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4/12 pitch is 100 square feet, and the roof is 100 square feet wide. The slope multiplier is √(rise² + 12²) ÷ 12, which scales the footprint up to the actual surface. Roof area is measured in "squares" of 100 square feet, and asphalt shingles come three bundles to the square. A waste allowance covers cuts, ridges, hips and starter courses. With 10% waste that is about 13.9 squares — roughly 42 bundles of shingles. The 4/12 pitch is 100 square feet, and the roof is 100 square feet wide. The slope multiplier is √(rise² + 12²) ÷ 12, which scales the floor area up to the actual floor area.Worked example: a 40 × 30 ft footprint is 1,200 sq ft.Worked example: a 40 × 30 ft footprint is 1,200 sq ft.Worked example: a 40 × 30 ft footprint is 1,200 sq ft.Worked example: a 40 × 30 ft footprint is 1,200 sq ft.Worked example: a 40 × 30 ft footprint is 1,200 sq ft.Worked example: a 40 × 30 ft footprint is 1,200 sq ft.Worked example: a 40 × 30 ft footprint is 1,200 sq ft.Worked example: a 40 × 30 ft footprint is 1,200 sq ft.Worked example: a 40 × 30 ft footprint is 1,200 sq ft.Worked example: a 40 × 30 ft footprint is 1,200 sq ft.Worked example: a 40 × 30 ft footprint is 1,200 sq ft.Worked example: a 40 × 30