NEVADA C-9 LATHING AND
PLASTERING CERTIFICATION EXAM
QUESTIONS AND VERIFIED ANSWERS
JUST RELEASED.
1. According to ASTM C1063, what is the maximum spacing for nails or staples used to attach
metal lath to wood framing members?
A. 8 inches on center
B. 7 inches on center
C. 6 inches on center
D. 12 inches on center
Answer: C
Conceptual Explanation: ASTM C1063 specifies that for vertical wood supports, fasteners
should be spaced no more than 6 inches on center to ensure proper structural integrity of
the lath.
2. When applying a three-coat Portland cement plaster system, what is the required
minimum thickness for the scratch coat when measured from the face of the lath?
A. 1/8 inch
B. 1/4 inch
,C. 3/8 inch
D. 1/2 inch
Answer: C
Conceptual Explanation: The scratch coat in a standard three-coat system must be at least
3/8 inch thick to provide a sufficient base for the brown coat.
3. Which type of lime is specifically recommended for use in plastering due to its high
plasticity and immediate use capability?
A. Type N Normal Hydrated Lime
B. Quicklime
C. Type S Special Hydrated Lime
D. Dolomitic Lime
Answer: C
Conceptual Explanation: Type S (Special) hydrated lime is preferred because it has
undergone a process that ensures high plasticity and limits unhydrated oxides, allowing for
immediate use.
4. What is the minimum overlap required for metal lath at the side laps according to industry
standards?
A. 1/2 inch
B. 1 inch
, C. 2 inches
D. 3 inches
Answer: A
Conceptual Explanation: Standard practice and ASTM C1063 require a minimum 1/2 inch
lap at the sides of metal lath sheets.
5. In Exterior Insulation and Finish Systems (EIFS), which component is responsible for
providing the primary water-resistive barrier?
A. The base coat
B. The finish coat
C. The EPS insulation board
D. The fluid-applied membrane on the substrate
Answer: D
Conceptual Explanation: In modern Class PB EIFS, the water-resistive barrier is applied
directly to the substrate before the insulation board is attached.
6. What is the purpose of a ‘weep screed’ in a stucco assembly?
A. To allow moisture to exit from behind the plaster
B. To provide a decorative edge
C. To reinforce the bottom of the wall against impact
PLASTERING CERTIFICATION EXAM
QUESTIONS AND VERIFIED ANSWERS
JUST RELEASED.
1. According to ASTM C1063, what is the maximum spacing for nails or staples used to attach
metal lath to wood framing members?
A. 8 inches on center
B. 7 inches on center
C. 6 inches on center
D. 12 inches on center
Answer: C
Conceptual Explanation: ASTM C1063 specifies that for vertical wood supports, fasteners
should be spaced no more than 6 inches on center to ensure proper structural integrity of
the lath.
2. When applying a three-coat Portland cement plaster system, what is the required
minimum thickness for the scratch coat when measured from the face of the lath?
A. 1/8 inch
B. 1/4 inch
,C. 3/8 inch
D. 1/2 inch
Answer: C
Conceptual Explanation: The scratch coat in a standard three-coat system must be at least
3/8 inch thick to provide a sufficient base for the brown coat.
3. Which type of lime is specifically recommended for use in plastering due to its high
plasticity and immediate use capability?
A. Type N Normal Hydrated Lime
B. Quicklime
C. Type S Special Hydrated Lime
D. Dolomitic Lime
Answer: C
Conceptual Explanation: Type S (Special) hydrated lime is preferred because it has
undergone a process that ensures high plasticity and limits unhydrated oxides, allowing for
immediate use.
4. What is the minimum overlap required for metal lath at the side laps according to industry
standards?
A. 1/2 inch
B. 1 inch
, C. 2 inches
D. 3 inches
Answer: A
Conceptual Explanation: Standard practice and ASTM C1063 require a minimum 1/2 inch
lap at the sides of metal lath sheets.
5. In Exterior Insulation and Finish Systems (EIFS), which component is responsible for
providing the primary water-resistive barrier?
A. The base coat
B. The finish coat
C. The EPS insulation board
D. The fluid-applied membrane on the substrate
Answer: D
Conceptual Explanation: In modern Class PB EIFS, the water-resistive barrier is applied
directly to the substrate before the insulation board is attached.
6. What is the purpose of a ‘weep screed’ in a stucco assembly?
A. To allow moisture to exit from behind the plaster
B. To provide a decorative edge
C. To reinforce the bottom of the wall against impact
