Maryland Lathing and Plastering
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
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1. What is the primary purpose of lathing in plaster wall systems?
A. To provide electrical grounding for wall systems
B. To serve as a decorative exterior finish
C. To create a mechanical key for plaster adhesion
D. To replace framing in interior walls
Correct Answer: C
The primary function of lathing is to provide a secure surface for
plaster to grip, ensuring strong adhesion between the wall structure
and the applied plaster layers.
2. Which material is most commonly used for modern metal lath
applications?
A. Aluminum foil sheets
B. Expanded galvanized steel mesh
C. Copper wiring grids
D. Plastic sheeting
Correct Answer: B
, Expanded galvanized steel mesh is widely used because it is durable,
corrosion-resistant, and provides excellent bonding support for
plaster.
3. What is the main purpose of a scratch coat in plastering?
A. To serve as the final decorative surface
B. To provide insulation against heat
C. To create a rough base layer for bonding
D. To waterproof exterior walls completely
Correct Answer: C
The scratch coat is applied first and intentionally roughened to help
the next plaster layer adhere properly.
4. Which tool is primarily used to apply and spread plaster onto lath?
A. Brick hammer
B. Hawk and trowel
C. Pipe wrench
D. Chisel and mallet
Correct Answer: B
A hawk holds plaster while a trowel is used to apply and spread it
evenly across the surface.
5. What is the typical spacing requirement for metal lath fasteners?
A. Every 24 inches
B. Every 18 inches
C. Every 6 inches
D. Every 1 inch
Correct Answer: C
Fasteners are generally spaced about 6 inches apart to ensure secure
attachment and prevent movement of the lath.
6. Which layer follows the scratch coat in a traditional three-coat plaster
system?
, A. Finish coat
B. Brown coat
C. Seal coat
D. Vapor coat
Correct Answer: B
The brown coat is applied after the scratch coat to build thickness
and further level the surface.
7. What is the main reason control joints are installed in plaster systems?
A. To improve color consistency
B. To allow movement and prevent cracking
C. To increase fire resistance
D. To reduce drying time
Correct Answer: B
Control joints accommodate structural movement and help prevent
uncontrolled cracking in plaster surfaces.
8. Which condition most negatively affects plaster curing?
A. Moderate humidity
B. Controlled temperature
C. Rapid drying from high heat or wind
D. Low light exposure
Correct Answer: C
Rapid drying causes shrinkage cracks and weakens the plaster’s
structural integrity.
9. What is the function of bonding agents in plastering?
A. To color the plaster
B. To increase adhesion between surfaces
C. To speed up drying time
D. To reduce plaster thickness
Correct Answer: B
Certification Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2026 Q&A| Instant
Download Pdf
1. What is the primary purpose of lathing in plaster wall systems?
A. To provide electrical grounding for wall systems
B. To serve as a decorative exterior finish
C. To create a mechanical key for plaster adhesion
D. To replace framing in interior walls
Correct Answer: C
The primary function of lathing is to provide a secure surface for
plaster to grip, ensuring strong adhesion between the wall structure
and the applied plaster layers.
2. Which material is most commonly used for modern metal lath
applications?
A. Aluminum foil sheets
B. Expanded galvanized steel mesh
C. Copper wiring grids
D. Plastic sheeting
Correct Answer: B
, Expanded galvanized steel mesh is widely used because it is durable,
corrosion-resistant, and provides excellent bonding support for
plaster.
3. What is the main purpose of a scratch coat in plastering?
A. To serve as the final decorative surface
B. To provide insulation against heat
C. To create a rough base layer for bonding
D. To waterproof exterior walls completely
Correct Answer: C
The scratch coat is applied first and intentionally roughened to help
the next plaster layer adhere properly.
4. Which tool is primarily used to apply and spread plaster onto lath?
A. Brick hammer
B. Hawk and trowel
C. Pipe wrench
D. Chisel and mallet
Correct Answer: B
A hawk holds plaster while a trowel is used to apply and spread it
evenly across the surface.
5. What is the typical spacing requirement for metal lath fasteners?
A. Every 24 inches
B. Every 18 inches
C. Every 6 inches
D. Every 1 inch
Correct Answer: C
Fasteners are generally spaced about 6 inches apart to ensure secure
attachment and prevent movement of the lath.
6. Which layer follows the scratch coat in a traditional three-coat plaster
system?
, A. Finish coat
B. Brown coat
C. Seal coat
D. Vapor coat
Correct Answer: B
The brown coat is applied after the scratch coat to build thickness
and further level the surface.
7. What is the main reason control joints are installed in plaster systems?
A. To improve color consistency
B. To allow movement and prevent cracking
C. To increase fire resistance
D. To reduce drying time
Correct Answer: B
Control joints accommodate structural movement and help prevent
uncontrolled cracking in plaster surfaces.
8. Which condition most negatively affects plaster curing?
A. Moderate humidity
B. Controlled temperature
C. Rapid drying from high heat or wind
D. Low light exposure
Correct Answer: C
Rapid drying causes shrinkage cracks and weakens the plaster’s
structural integrity.
9. What is the function of bonding agents in plastering?
A. To color the plaster
B. To increase adhesion between surfaces
C. To speed up drying time
D. To reduce plaster thickness
Correct Answer: B
