1. What is a Ridge Board?

A ridge board is the horizontal member at the peak of a roof that connects the rafters. It provides a bearing surface for the rafters and helps maintain the roof's structural integrity.

2. How Ridge Board Sizing Works

Ridge board sizing is determined by rafter span tables which consider:

Where:

• Rafter Span — The horizontal distance covered by the rafters
• Roof Load — Snow, wind, and dead loads affecting the structure
• Wood Species — Strength characteristics of the lumber used

Explanation: Longer spans require larger ridge boards to adequately support the roof structure and transfer loads properly.

3. Importance of Proper Ridge Board Sizing

Details: Correct ridge board sizing is crucial for structural integrity, preventing roof sagging, and ensuring the roof can withstand environmental loads.

4. Using the Calculator

Tips: Enter the rafter span in feet. The calculator will recommend an appropriate ridge board size based on standard span tables.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between a ridge board and ridge beam?
A: A ridge board is primarily a connection point for rafters, while a ridge beam is a structural member that carries roof loads.

Q2: When is a ridge board required?
A: Ridge boards are typically used in conventional rafter framing where rafters oppose each other at the ridge.

Q3: Can I use a smaller ridge board than recommended?
A: No, using undersized ridge boards can compromise structural integrity and may violate building codes.

Q4: How does roof pitch affect ridge board sizing?
A: Steeper pitches generally put less horizontal thrust on the ridge, while shallower pitches create more outward thrust.

Q5: Are there code requirements for ridge boards?
A: Yes, building codes specify minimum sizes based on rafter span, spacing, and expected loads.