North Carolina Building Contractor License Practice Exam

What is the required spacing for No. 18 SWG steel wires in the context of roof insulation?

1. 12 inches

2. 18 inches

3. 24 inches

4. 36 inches

The correct answer is: 24 inches

The required spacing for No. 18 SWG (Standard Wire Gauge) steel wires in the context of roof insulation is 24 inches. This spacing is essential to ensure that the insulation material is adequately supported and remains in place, especially under varying weather conditions and potential loads. Using wire to secure insulation helps maintain its thermal efficiency. If the wires are too far apart, the insulation may sag or settle, leading to reduced performance and heat loss. The 24-inch spacing is a recommended standard that balances support and cost-effectiveness while ensuring the insulation remains effective over time. It provides sufficient reinforcement without unnecessary materials or labor costs, making it a practical choice for builders and contractors. Those who selected other spacing options might not be familiar with the industry standards or specific building codes that dictate the use of steel wires in insulation applications. Following the correct spacing helps maintain structural integrity and energy efficiency in the building.