The NOT a standard thickness of gypsum lath is:

The NOT a standard thickness of gypsum lath is:

• A. 3/8 in
• B. 1/2 in
• C. 5/8 in
• D. 7/8 in

Answer: (D)

Gypsum lath is chosen in thin, standard thicknesses so plaster can bond properly and the wall finishes align with framing. The common thicknesses are 3/8 inch, 1/2 inch, and 5/8 inch. These sizes fit typical stud spacing and allow the plaster to build up in the intended coats without creating awkward gaps or excessive bulk. A thickness of 7/8 inch would be unusually thick for lath, making fastening and aligning with the framing difficult and producing an overly thick plaster shell. That’s why 7/8 inch is not a standard gypsum lath thickness.

Gypsum lath is chosen in thin, standard thicknesses so plaster can bond properly and the wall finishes align with framing. The common thicknesses are 3/8 inch, 1/2 inch, and 5/8 inch. These sizes fit typical stud spacing and allow the plaster to build up in the intended coats without creating awkward gaps or excessive bulk. A thickness of 7/8 inch would be unusually thick for lath, making fastening and aligning with the framing difficult and producing an overly thick plaster shell. That’s why 7/8 inch is not a standard gypsum lath thickness.