The insulating gypsum lath provides which features?

The insulating gypsum lath provides which features?

• A. Vapor barrier and thermal insulation
• B. Structural support
• C. Sound absorption
• D. Water resistance

Answer: (A)

Insulating gypsum lath is designed to slow heat transfer and control moisture in a plaster wall. The insulating layer reduces thermal conductivity, helping keep interior temperatures more stable. It also acts as a vapor barrier, limiting the diffusion of water vapor through the wall and helping prevent condensation and damp conditions inside the cavity. It isn’t meant to provide structural support—that’s the job of the framing or studs—and while plaster assemblies can affect sound, insulating gypsum lath isn’t chosen for sound absorption. It also isn’t a primary source of water resistance, since gypsum can be damaged by moisture, so moisture protection comes from other parts of the wall system.

Insulating gypsum lath is designed to slow heat transfer and control moisture in a plaster wall. The insulating layer reduces thermal conductivity, helping keep interior temperatures more stable. It also acts as a vapor barrier, limiting the diffusion of water vapor through the wall and helping prevent condensation and damp conditions inside the cavity. It isn’t meant to provide structural support—that’s the job of the framing or studs—and while plaster assemblies can affect sound, insulating gypsum lath isn’t chosen for sound absorption. It also isn’t a primary source of water resistance, since gypsum can be damaged by moisture, so moisture protection comes from other parts of the wall system.