Carpenter Red Seal Exam Prep · Question
A scaffold platform is being used by two carpenters. The platform is 600 mm wide and 3.0 metres long. Each carpenter weighs 90 kg, and they have 50 kg of tools and materials. What is the minimum uniformly distributed load (kPa) a scaffold plank within this platform should be rated for, considering a safety factor of 4:1 for live load?
Total live load is (2 * 90 kg + 50 kg) = 230 kg. Platform area is 0.6 m * 3.0 m = 1.8 m². Load = 230 kg / 1.8 m² = 127.8 kg/m². Multiply by 9.81 N/kg to get 125
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Question: A scaffold platform is being used by two carpenters. The platform is 600 mm wide and 3.0 metres long. Each carpenter weighs 90 kg, and they have 50 kg of tools and materials. What is the minimum uniformly distributed load (kPa) a scaffold plank within this platform should be rated for, considering a safety factor of 4:1 for live load?
Answer options:
- 1.2 kPa ✅ 2.4 kPa
- 3.6 kPa
- 4.8 kPa
Correct answer: 2.4 kPa
Explanation: Total live load is (2 * 90 kg + 50 kg) = 230 kg. Platform area is 0.6 m * 3.0 m = 1.8 m². Load = 230 kg / 1.8 m² = 127.8 kg/m². Multiply by 9.81 N/kg to get 1253 N/m² = 1.25 kPa. For plank rating, typically light-duty scaffolds require 2.4 kPa (CSA S269.3-16).
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