Red Seal Drywall Finisher and Plasterer Practice Exam

What type of sealing compound is often recommended for drywall joints in wet areas?

1. Standard acrylic sealant

2. Polyurethane sealant

3. Mold-resistant joint compound

4. Silicone-based sealant

The correct answer is: Mold-resistant joint compound

Mold-resistant joint compound is specifically designed for use in areas prone to moisture, making it an ideal choice for drywall joints in wet areas. This type of compound contains additives that help inhibit the growth of mold and mildew, which can thrive in damp environments. The formulation allows it to withstand high humidity levels, ensuring that the integrity of the drywall remains intact over time. In comparison, while standard acrylic and polyurethane sealants have their specific benefits, they are not inherently resistant to mold and moisture in the same way that mold-resistant joint compounds are. Silicone-based sealants are excellent for waterproofing and can be used in wet areas, but they are not typically used for drywall joints. Instead, they are more suited for sealing gaps and joints in areas like countertops or bathroom fixtures. Hence, the mold-resistant joint compound is the most effective option for drywall applications in wet environments, ensuring durability and maintaining indoor air quality by preventing mold proliferation.