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Georgia Vapor Barrier Inspector Exam
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of a vapor barrier in a building
assembly?
A. Improve sound insulation
B. Reduce energy usage
C. Control moisture migration
D. Protect against UV exposure
Correct answer: C — Vapor barriers are installed to slow or stop
moisture vapor movement through building assemblies.
2. Which material is most commonly used as a vapor barrier in
residential construction?
A. Asphalt felt
B. Plywood
C. Polyethylene sheeting
D. Cement board
Correct answer: C — Polyethylene is widely used due to its low
permeability.
3. Vapor barrier effectiveness is measured by its:
A. Temperature rating
B. UV resistance
C. Perm rating
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D. Fire resistance
Correct answer: C — The perm rating measures resistance to
vapor transmission.
4. A vapor retarder with a perm rating less than or equal to 0.1
perms is classified as:
A. Class I
B. Class II
C. Class III
D. Class IV
Correct answer: A — Class I vapor retarders are 0.1 perms or less.
5. Which of the following is a Class I vapor barrier?
A. Kraft paper
B. 6-mil polyethylene
C. Latex paint
D. Unfaced insulation
Correct answer: B — Poly sheeting is a Class I vapor barrier.
6. Where should a vapor barrier typically be placed in a cold climate?
A. Exterior face of insulation
B. Interior/warm side of insulation
C. Middle of the wall assembly
D. On both sides of insulation
Correct answer: B — Prevents warm interior moisture from
migrating into cold spaces.
7. Installing vapor barriers on both sides of a wall can cause:
A. Fire hazards
B. Moisture trapping and mold growth
C. Noise issues
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D. Structural instability
Correct answer: B — Two vapor barriers can trap moisture inside
assemblies.
8. The continuity of a vapor barrier is most often compromised by:
A. Paint
B. Concrete curing
C. Penetrations and unsealed seams
D. Insulation density
Correct answer: C — Holes and gaps significantly reduce
effectiveness.
9. Which tape is recommended for sealing polyethylene vapor
barriers?
A. Duct tape
B. Masking tape
C. Cloth tape
D. Acrylic-based vapor barrier tape
Correct answer: D — Acrylic tape maintains long-term adhesion.
10. A vapor barrier is required under concrete slabs primarily to
prevent:
A. Odor migration
B. Soil shifting
C. Moisture vapor movement from the ground
D. Cold temperatures
Correct answer: C — Vapor barriers beneath slabs stop ground
moisture migration.
11. Under-slab vapor barriers should be a minimum of:
A. 2 mils
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answer
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exam
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questions
accurate exam
and
exam
solutions
answer
questions
sets and
subject-wise
solutions exam questions and solutions
Georgia Vapor Barrier Inspector Exam
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A | Instant
Download Pdf
1. What is the primary purpose of a vapor barrier in a building
assembly?
A. Improve sound insulation
B. Reduce energy usage
C. Control moisture migration
D. Protect against UV exposure
Correct answer: C — Vapor barriers are installed to slow or stop
moisture vapor movement through building assemblies.
2. Which material is most commonly used as a vapor barrier in
residential construction?
A. Asphalt felt
B. Plywood
C. Polyethylene sheeting
D. Cement board
Correct answer: C — Polyethylene is widely used due to its low
permeability.
3. Vapor barrier effectiveness is measured by its:
A. Temperature rating
B. UV resistance
C. Perm rating
Page 1 of 26 2026/2027 testbank answer
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key accurate exam
testbank
answer
answer
sets subject-wise
key accurateexam
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1 questions and solutions
,Page 2 of 262026/2027 testbank
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and
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solutions
answer
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sets and
subject-wise
solutions exam questions and solutions
D. Fire resistance
Correct answer: C — The perm rating measures resistance to
vapor transmission.
4. A vapor retarder with a perm rating less than or equal to 0.1
perms is classified as:
A. Class I
B. Class II
C. Class III
D. Class IV
Correct answer: A — Class I vapor retarders are 0.1 perms or less.
5. Which of the following is a Class I vapor barrier?
A. Kraft paper
B. 6-mil polyethylene
C. Latex paint
D. Unfaced insulation
Correct answer: B — Poly sheeting is a Class I vapor barrier.
6. Where should a vapor barrier typically be placed in a cold climate?
A. Exterior face of insulation
B. Interior/warm side of insulation
C. Middle of the wall assembly
D. On both sides of insulation
Correct answer: B — Prevents warm interior moisture from
migrating into cold spaces.
7. Installing vapor barriers on both sides of a wall can cause:
A. Fire hazards
B. Moisture trapping and mold growth
C. Noise issues
Page 2 of 26 2026/2027 testbank answer
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answer
sets subject-wise
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, Page 3 of 262026/2027 testbank
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answer
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sets and
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solutions exam questions and solutions
D. Structural instability
Correct answer: B — Two vapor barriers can trap moisture inside
assemblies.
8. The continuity of a vapor barrier is most often compromised by:
A. Paint
B. Concrete curing
C. Penetrations and unsealed seams
D. Insulation density
Correct answer: C — Holes and gaps significantly reduce
effectiveness.
9. Which tape is recommended for sealing polyethylene vapor
barriers?
A. Duct tape
B. Masking tape
C. Cloth tape
D. Acrylic-based vapor barrier tape
Correct answer: D — Acrylic tape maintains long-term adhesion.
10. A vapor barrier is required under concrete slabs primarily to
prevent:
A. Odor migration
B. Soil shifting
C. Moisture vapor movement from the ground
D. Cold temperatures
Correct answer: C — Vapor barriers beneath slabs stop ground
moisture migration.
11. Under-slab vapor barriers should be a minimum of:
A. 2 mils
Page 3 of 26 2026/2027 testbank answer
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testbank
answer
answer
sets subject-wise
key accurateexam
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