Types of gypsum lath include which of the following?

Types of gypsum lath include which of the following?

• A. Perforated
• B. Lead-backed
• C. Type X
• D. All of the above

Answer: (D)

Gypsum lath is a gypsum-based backing used under plaster to provide a stable surface and to help the plaster key into place. There are several forms to meet different needs: perforated gypsum lath provides openings for the plaster to grab and anchor itself as it sets; lead-backed gypsum lath involves a sheet of lead behind the gypsum in some assemblies to enhance fire resistance or moisture control in specific historic or specialized applications; Type X gypsum lath is formulated to contribute to fire resistance and is used where fire ratings are required. Because each of these serves a distinct purpose in plastering assemblies, all of the above are considered types of gypsum lath.

Gypsum lath is a gypsum-based backing used under plaster to provide a stable surface and to help the plaster key into place. There are several forms to meet different needs: perforated gypsum lath provides openings for the plaster to grab and anchor itself as it sets; lead-backed gypsum lath involves a sheet of lead behind the gypsum in some assemblies to enhance fire resistance or moisture control in specific historic or specialized applications; Type X gypsum lath is formulated to contribute to fire resistance and is used where fire ratings are required. Because each of these serves a distinct purpose in plastering assemblies, all of the above are considered types of gypsum lath.