Rafter Calculator Span

What is a Rafter Calculator Span?

A rafter calculator span is a tool or web application designed to help calculate the length or span of rafters needed for constructing a roof.

It considers factors such as the width of the roof and the roof pitch to determine the rafter span accurately.

Why Use a Rafter Calculator Span?

A rafter calculator span is used to simplify the process of determining the required rafter length for a roofing project.

It’s beneficial for builders and homeowners as it ensures that the right materials are used, leading to a structurally sound and safe roof.

How to Use a Rafter Calculator Span:

1. Enter the width of the roof in feet.
2. Specify the roof pitch, typically in inches per foot (e.g., 6 inches per foot for a 6/12 pitch).
3. Click the "Calculate Rafter Span" button.
4. The calculator will display the estimated rafter span required for your roof.

Example Calculation:

• Roof Width: 24 feet
• Roof Pitch: 6 inches per foot (6/12 pitch)

Rafter Span = 24 feet / cos(arctan(6/12)) = 24 feet / cos(26.57 degrees) ≈ 27.71 feet

The estimated rafter span is approximately 26.83 feet in this example.

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