Free Roofing Squares Calculator Canada — Pitch, Bundles & Underlayment
Calculate roof slope factor, pitch angle in degrees, true sloped roof area (sq ft & m²), roofing squares, architectural shingle bundles, synthetic underlayment rolls, and Canadian eave Ice & Water shield.
1. Roof Footprint, Pitch & Waste Factor
Transparent Roofing Math Used:
• Slope Factor = √(1 + (6/12)²) = 1.1180 (26.6°)
• True Area = 1700 sq ft × 1.1180 = 1901 sq ft (176.6 m²)
• Squares = 1901 / 100 = 19.01 net sq (21.29 sq w/ 12% waste)
• Bundles = ⌈19.01 × 3 × (1 + 0.12)⌉ = 64 bundles
Prairie Peak Roofing & Exteriors Ltd.
Varsity NW Roof Replacement — 48×32 Hip
Material Bill of Quantities (Includes 12% Waste Factor)
| Material Item | Spec / Coverage | Order Quantity |
|---|---|---|
| Field Shingle Bundles | 3 bundles / square | 64 Bundles |
| Roof Underlayment Rolls | 1 roll ≈ 4 squares | 6 Rolls |
| Eave Ice & Water Shield (Canadian Code 2 Courses) | ~195 sq ft / roll | 3 Rolls |
| Hip & Ridge Cap Shingle Bundles | ~30 lin ft / bundle | 3 Bundles |
| Hot-Dipped Galvanized Coil Roofing Nails (1-1/4") | ~2.5 lbs / square | 54 lbs |
| Estimated Base Material Cost (Shingles + Underlayment + Caps) | $3,983 CAD | |
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Disclaimer: For informational and preliminary estimating purposes only. Always verify actual roof facets, dormers, valleys, and manufacturer bundle coverage before ordering materials.