Which of the following is NOT considered a safest path of travel on a roof?

• A. Exterior Walls
• B. Center of the Roof
• C. Ridges
• D. Purlins

Answer: (B)

The safest path to travel on a roof relies on staying along structural lines that are designed to carry loads and provide solid footing. Walking near exterior walls, along the ridge where rafters meet, or along sound purlins keeps you close to continuous support and gives you predictable footing, which reduces the risk of stepping into weak, unsupported areas. The center of the roof is not a safest path because it typically sits between major supports, where spans can be long and the decking or underlying members may be weakened by fire or damage. This area is more prone to collapse and may conceal hidden fire or structural failures, making it the least reliable route. So, the center of the roof is avoided in favor of routes that run along walls, along ridges, or along sound purlins for a safer, more controllable travel path.