Red Seal Lather (Interior Systems Mechanic) Exam 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 400

What material is typically used to reinforce drywall in wet locations?

Foam board

Cement board

Cement board is the material typically used to reinforce drywall in wet locations because it is designed to resist moisture and prevent the growth of mold and mildew. Furthermore, cement board provides a durable backing for tile and is less susceptible to water damage compared to other materials. It is commonly utilized in areas such as bathrooms and kitchens where high humidity is expected.

The other options, while they have their own applications, are not ideal for wet environments. Foam board is mainly used for insulation and is not moisture-resistant. Plywood can absorb water, leading to warping or mold growth. Chipboard also has limited moisture resistance and is not suitable for areas exposed to water. Thus, cement board is the clear choice for wet location reinforcement in drywall installations.

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Plywood

Chipboard

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