Coverage Formula:
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Hardie shingles are fiber cement siding products designed to look like traditional wood shingles. Coverage is typically calculated as 1 unit per square foot of area to be covered.
The calculator uses the simple coverage formula:
Where:
Details: Proper calculation ensures you purchase the correct amount of materials, minimizing waste and avoiding project delays from insufficient supplies.
Tips: Measure the total area to be covered in square feet. Account for all surfaces including gables and dormers. Always add 10% extra for cutting waste and mistakes.
Q1: How do I measure the area accurately?
A: Break down the surface into rectangles, calculate each area (length × width), and sum them all.
Q2: Should I include windows and doors?
A: No, subtract these areas from your total calculation as they won't be covered.
Q3: What about waste factor?
A: The calculator shows exact needs. For ordering, add 10-15% more to account for cutting waste.
Q4: Does this work for Hardie panel products?
A: No, panel products have different coverage calculations based on their specific dimensions.
Q5: How does pitch affect coverage?
A: Steeper roofs may require slightly more material due to increased surface area from the pitch.