AK Insulation Contractor Exam Questions
and Correct Answers (Verified Answers)
Plus Rationale 2027 Q&A| Instant
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1. What is the primary purpose of insulation in a building assembly?
a. To increase structural load capacity
b. To improve electrical conductivity
c. To reduce heat transfer
d. To eliminate all air movement
Rationale: Insulation primarily slows the transfer of heat between
areas with different temperatures. It can improve energy efficiency
and occupant comfort, although it does not by itself eliminate air
leakage or provide structural reinforcement.
2. Which property is commonly used to describe the thermal
resistance of insulation?
,a. U-factor
b. R-value
c. CFM
d. PSI
Rationale: R-value measures resistance to heat flow. In general, a
higher R-value indicates greater resistance to conductive heat
transfer, assuming comparable conditions and proper installation.
3. Which condition can significantly reduce the effectiveness of
fiberglass batt insulation?
a. Proper compression
b. Correct installation
c. Gaps and voids around the batt
d. Continuous contact with framing
Rationale: Gaps and voids allow heat to bypass the insulation.
Fiberglass batts perform best when they completely fill the intended
cavity without significant gaps, compression, or displacement.
4. What is the main function of a vapor retarder in a building
assembly?
a. To increase structural strength
b. To provide electrical grounding
,c. To limit vapor diffusion through the assembly
d. To replace all air-sealing materials
Rationale: A vapor retarder is designed to reduce the movement of
water vapor by diffusion. It is different from an air barrier, which
controls air movement.
5. Which insulation material is commonly manufactured from
melted glass fibers?
a. Cellulose
b. Mineral wool
c. Fiberglass
d. Polyurethane
Rationale: Fiberglass insulation is made primarily from fine glass
fibers. It is commonly supplied in batts, rolls, and loose-fill products.
6. Why should insulation batts be cut carefully around electrical
boxes?
a. To make the box heavier
b. To prevent the box from grounding
c. To maintain insulation coverage while accommodating the box
d. To increase the box voltage
, Rationale: Proper fitting around electrical boxes reduces gaps and
helps maintain thermal performance. Insulation should also be
installed according to applicable electrical-clearance and product
requirements.
7. Which insulation is commonly blown into attics using specialized
equipment?
a. Rigid foam board only
b. Fiberglass batt
c. Loose-fill fiberglass or cellulose
d. Cement board
Rationale: Loose-fill fiberglass and cellulose are frequently installed
using blowing machines. This method allows insulation to cover
irregular attic areas and reach difficult locations.
8. What does thermal bridging refer to?
a. Moisture moving through a roof
b. Electrical current crossing framing
c. Heat moving through a more conductive part of an assembly
d. Air being filtered through insulation
and Correct Answers (Verified Answers)
Plus Rationale 2027 Q&A| Instant
Download Pdf
1. What is the primary purpose of insulation in a building assembly?
a. To increase structural load capacity
b. To improve electrical conductivity
c. To reduce heat transfer
d. To eliminate all air movement
Rationale: Insulation primarily slows the transfer of heat between
areas with different temperatures. It can improve energy efficiency
and occupant comfort, although it does not by itself eliminate air
leakage or provide structural reinforcement.
2. Which property is commonly used to describe the thermal
resistance of insulation?
,a. U-factor
b. R-value
c. CFM
d. PSI
Rationale: R-value measures resistance to heat flow. In general, a
higher R-value indicates greater resistance to conductive heat
transfer, assuming comparable conditions and proper installation.
3. Which condition can significantly reduce the effectiveness of
fiberglass batt insulation?
a. Proper compression
b. Correct installation
c. Gaps and voids around the batt
d. Continuous contact with framing
Rationale: Gaps and voids allow heat to bypass the insulation.
Fiberglass batts perform best when they completely fill the intended
cavity without significant gaps, compression, or displacement.
4. What is the main function of a vapor retarder in a building
assembly?
a. To increase structural strength
b. To provide electrical grounding
,c. To limit vapor diffusion through the assembly
d. To replace all air-sealing materials
Rationale: A vapor retarder is designed to reduce the movement of
water vapor by diffusion. It is different from an air barrier, which
controls air movement.
5. Which insulation material is commonly manufactured from
melted glass fibers?
a. Cellulose
b. Mineral wool
c. Fiberglass
d. Polyurethane
Rationale: Fiberglass insulation is made primarily from fine glass
fibers. It is commonly supplied in batts, rolls, and loose-fill products.
6. Why should insulation batts be cut carefully around electrical
boxes?
a. To make the box heavier
b. To prevent the box from grounding
c. To maintain insulation coverage while accommodating the box
d. To increase the box voltage
, Rationale: Proper fitting around electrical boxes reduces gaps and
helps maintain thermal performance. Insulation should also be
installed according to applicable electrical-clearance and product
requirements.
7. Which insulation is commonly blown into attics using specialized
equipment?
a. Rigid foam board only
b. Fiberglass batt
c. Loose-fill fiberglass or cellulose
d. Cement board
Rationale: Loose-fill fiberglass and cellulose are frequently installed
using blowing machines. This method allows insulation to cover
irregular attic areas and reach difficult locations.
8. What does thermal bridging refer to?
a. Moisture moving through a roof
b. Electrical current crossing framing
c. Heat moving through a more conductive part of an assembly
d. Air being filtered through insulation
