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When figuring out how many roofing materials you'll need, the roof pitch factor is a key number. It's essentially a multiplier based on the steepness of your roof. A steeper roof has a larger surface area than its footprint, so this factor helps calculate the true square footage. For example, a 6/12 pitch has a factor of about 1.12, meaning you need 12% more material than a flat roof of the same house. It's a practical tool for estimating costs and preventing material shortages.

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