Red Seal Lather (Interior Systems Mechanic) Practice Exam

Which type of drywall is most suitable for areas with high moisture, such as bathrooms?

1. Standard drywall

2. Moisture-resistant drywall

3. Fire-resistant drywall

4. Gypsum board

The correct answer is: Moisture-resistant drywall

Moisture-resistant drywall, often referred to as green board, is specifically designed for high-moisture areas like bathrooms. This type of drywall has additives that help prevent moisture absorption, which reduces the risk of mold and mildew growth. It typically features a water-resistant core and a special facing, allowing it to withstand the humid conditions commonly found in bathrooms and other damp spaces. In contrast, standard drywall is not made to resist moisture, which means it can quickly deteriorate and become a breeding ground for mold. Fire-resistant drywall is designed to withstand heat and flame, protecting walls from fire hazards, but it doesn't offer the moisture-resistance needed in wet environments. Gypsum board is a broader category that includes different types of drywall, but without specific moisture resistance, it would also not be suitable for high-moisture areas. Choosing moisture-resistant drywall is essential for maintaining the integrity of walls in bathrooms and ensuring a healthier living environment by preventing moisture-related issues.