Red Seal Drywall Finisher and Plasterer Practice Exam

What feature is characteristic of "moisture-resistant" drywall sheets?

1. They have a brown paper backing

2. They are denser than regular drywall

3. They have a green paper backing that resists mold growth

4. They are reinforced with metal

The correct answer is: They have a green paper backing that resists mold growth

Moisture-resistant drywall sheets, commonly known as green board, are specifically designed to withstand higher humidity levels and resist mold growth. The characteristic feature of these sheets is their green paper backing, which serves as an additional layer of protection against moisture. This unique backing helps prevent water from penetrating the material, reducing the likelihood of mold and mildew developing, which is particularly important in areas prone to dampness, such as bathrooms and kitchens. While brown paper backing is associated with regular drywall and density variances can occur in different types of drywall, it is the green backing that distinctly identifies moisture-resistant drywall. Reinforcement with metal is not a standard feature of moisture-resistant drywall; instead, it is primarily the composition and paper backing that provide its moisture-resistant qualities. Understanding the specific characteristics of drywall types is crucial for selecting the appropriate material for different construction environments.