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To size a valley rafter, first determine the load it will carry, which includes the weight of the roofing materials, snow load, and any additional loads. Next, calculate the span of the valley rafter, which is the distance between the points where it is supported. Use these factors along with building codes and span tables to select an appropriate size and species of lumber. Typically, valley rafters are sized larger than standard rafters to accommodate the increased load and provide adequate support.

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3mo ago

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