How to Use the Roofing Calculator
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Select Your Roof Style
- Choose between Gable, Hip, Flat, Mansard, or Gambrel roof styles
- Each style may require different calculations for valleys and hips
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Choose Roofing Material
- Asphalt Shingles: Most common, includes 15% waste factor
- Metal Roofing: Includes 10% waste factor
- Tile: Includes 20% waste factor for breakage
- Slate: Includes 15% waste factor
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Select Measurement Unit
- Choose between feet or meters based on your preference
- All measurements will be calculated in your chosen unit
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Enter Roof Sections
- Divide your roof into sections for accurate calculations
- For each section, provide:
- Length and width measurements
- Roof pitch (slope)
- Valley and hip lengths (if applicable)
- Add multiple sections for complex roof designs
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Understanding Results
- Total squares needed (1 square = 100 square feet)
- Detailed materials list including:
- Main roofing material
- Underlayment rolls
- Nails/fasteners
- Starter strips
- Ridge caps
- Valley and hip materials
- Section-by-section breakdown
- Waste factor included in calculations
Tips for Accurate Measurements
- Measure from the ground to ensure safety
- Include overhangs in your measurements
- Double-check all measurements before calculating
- Consider adding extra material for repairs
- Account for all roof features (chimneys, skylights, etc.)
Safety Note
Always consult with a professional roofer for final measurements and material quantities. This calculator provides estimates only and should not be used as the sole basis for purchasing materials.