AR DW Drywall Contractor
Exam Questions and Correct
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Plus Rationale 2027 Q&A|
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1. Which type of gypsum board is commonly used for interior walls
and ceilings in dry, conditioned spaces?
a. Cement board
b. Regular gypsum wallboard
c. Exterior sheathing board
d. Glass-mat tile backer board
,Rationale: Regular gypsum wallboard is designed for typical interior
applications where excessive moisture is not expected. Cement board
and specialized backer boards are used in areas requiring greater
moisture resistance or support for tile systems. Exterior sheathing
serves different structural and weather-exposure purposes.
2. What is the primary purpose of the paper facing on conventional
gypsum wallboard?
a. To provide electrical grounding
b. To eliminate the need for joint compound
c. To provide a finished surface and reinforce the gypsum core
d. To prevent all moisture penetration
Rationale: The paper facing contributes to the board's strength,
protects the gypsum core, and provides a suitable surface for joint
treatment and decoration. It does not eliminate the need for joint
compound or provide a complete waterproof barrier.
3. Which drywall thickness is commonly used for standard residential
interior walls?
a. 1/4 inch
b. 1/2 inch
,c. 3/4 inch
d. 1 inch
Rationale: Half-inch gypsum board is commonly used for residential
interior walls when permitted by the applicable building requirements
and framing conditions. Thinner board is often used for specialized
applications, while thicker board may be required for certain fire-
resistance, sound-control, or ceiling installations.
4. What is the main purpose of moisture-resistant gypsum board?
a. To support heavy masonry without framing
b. To replace all waterproofing membranes
c. To provide improved resistance to moisture exposure in
appropriate interior applications
d. To prevent water damage under continuous immersion
Rationale: Moisture-resistant gypsum board is designed for certain
interior environments with intermittent moisture exposure. It is not
waterproof and should not be used as a substitute for a required
waterproofing system in showers or other continuously wet locations.
5. Which tool is most appropriate for cutting straight lines in gypsum
board?
, a. Pipe wrench
b. Utility knife and straightedge
c. Adjustable spanner
d. Concrete finishing trowel
Rationale: A sharp utility knife and straightedge allow the installer to
score the face paper accurately, snap the gypsum core, and cut the
back paper. This method produces clean, controlled cuts for most
straight drywall cuts.
6. Why should drywall sheets be stored flat on a dry, level surface?
a. To increase the weight of the sheets
b. To soften the gypsum core
c. To reduce the risk of sagging, warping, and edge damage
d. To eliminate the need for acclimatization
Rationale: Proper flat storage helps maintain the board's shape and
protects its edges from damage. Moisture, uneven support, and
prolonged improper storage can cause distortion that complicates
installation and finishing.
7. What is the primary function of drywall joint tape?
a. To hold electrical cables against studs
Exam Questions and Correct
Answers (Verified Answers)
Plus Rationale 2027 Q&A|
Instant Download Pdf
1. Which type of gypsum board is commonly used for interior walls
and ceilings in dry, conditioned spaces?
a. Cement board
b. Regular gypsum wallboard
c. Exterior sheathing board
d. Glass-mat tile backer board
,Rationale: Regular gypsum wallboard is designed for typical interior
applications where excessive moisture is not expected. Cement board
and specialized backer boards are used in areas requiring greater
moisture resistance or support for tile systems. Exterior sheathing
serves different structural and weather-exposure purposes.
2. What is the primary purpose of the paper facing on conventional
gypsum wallboard?
a. To provide electrical grounding
b. To eliminate the need for joint compound
c. To provide a finished surface and reinforce the gypsum core
d. To prevent all moisture penetration
Rationale: The paper facing contributes to the board's strength,
protects the gypsum core, and provides a suitable surface for joint
treatment and decoration. It does not eliminate the need for joint
compound or provide a complete waterproof barrier.
3. Which drywall thickness is commonly used for standard residential
interior walls?
a. 1/4 inch
b. 1/2 inch
,c. 3/4 inch
d. 1 inch
Rationale: Half-inch gypsum board is commonly used for residential
interior walls when permitted by the applicable building requirements
and framing conditions. Thinner board is often used for specialized
applications, while thicker board may be required for certain fire-
resistance, sound-control, or ceiling installations.
4. What is the main purpose of moisture-resistant gypsum board?
a. To support heavy masonry without framing
b. To replace all waterproofing membranes
c. To provide improved resistance to moisture exposure in
appropriate interior applications
d. To prevent water damage under continuous immersion
Rationale: Moisture-resistant gypsum board is designed for certain
interior environments with intermittent moisture exposure. It is not
waterproof and should not be used as a substitute for a required
waterproofing system in showers or other continuously wet locations.
5. Which tool is most appropriate for cutting straight lines in gypsum
board?
, a. Pipe wrench
b. Utility knife and straightedge
c. Adjustable spanner
d. Concrete finishing trowel
Rationale: A sharp utility knife and straightedge allow the installer to
score the face paper accurately, snap the gypsum core, and cut the
back paper. This method produces clean, controlled cuts for most
straight drywall cuts.
6. Why should drywall sheets be stored flat on a dry, level surface?
a. To increase the weight of the sheets
b. To soften the gypsum core
c. To reduce the risk of sagging, warping, and edge damage
d. To eliminate the need for acclimatization
Rationale: Proper flat storage helps maintain the board's shape and
protects its edges from damage. Moisture, uneven support, and
prolonged improper storage can cause distortion that complicates
installation and finishing.
7. What is the primary function of drywall joint tape?
a. To hold electrical cables against studs
