Which lath includes backing?

Which lath includes backing?

• A. F3/8 RB
• B. F3/8 FR
• C. 1/2 in plaster lath
• D. Expanded metal lath

Answer: (A)

Backed lath means the lath comes with a built-in backing material to give the plaster a solid surface to key to and to help hold the plaster in place. The designation on the lath that includes backing is the one with the RB suffix, which identifies a 3/8 inch lath that has this backing already incorporated. That’s why it’s the correct choice. The other options are standard plaster lath or metal lath materials that don’t include a built-in backing, so they don’t provide that reinforced backing surface.

Backed lath means the lath comes with a built-in backing material to give the plaster a solid surface to key to and to help hold the plaster in place. The designation on the lath that includes backing is the one with the RB suffix, which identifies a 3/8 inch lath that has this backing already incorporated. That’s why it’s the correct choice. The other options are standard plaster lath or metal lath materials that don’t include a built-in backing, so they don’t provide that reinforced backing surface.