ICC COMMERCIAL BUILDING INSPECTOR EXAM – QUESTIONS
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1. During the plan review of a newly proposed Type IIIB commercial mercantile building,
the design professional specifies exterior walls constructed entirely of fire-retardant-
treated wood framing. According to the International Building Code (IBC), what specific
documentation must be provided to the building official prior to the issuance of the
building permit to verify compliance of this material?
A. A written certification from the structural engineer of record stating that the wood was stored indoors
during transit
B. Identification marks stamped on each piece of lumber by an accredited agency indicating conformance
with AWPA standards and information regarding pressure treatment and fire performance
C. A receipt from the local lumber yard showing the purchase date and total board footage acquired for
the project
D. An affidavit signed by the building owner promising to inspect the wood annually for termite
infestation
Correct Answer: B. Identification marks stamped on each piece of lumber by an accredited
agency indicating conformance with AWPA standards and information regarding pressure
treatment and fire performance
IBC Chapter 23 mandates that fire-retardant-treated wood bear identification marks from an
approved agency showing compliance with applicable standards, ensuring the material
achieves the required flame spread index and structural integrity under fire conditions.
2. A commercial building inspector is conducting a footing inspection for a Group B office
building founded on expansive clay soils. The structural drawings require a monolithic
slab-on-grade designed in accordance with PTI standards. Upon arriving at the site, the
inspector notices that the perimeter vapor retarder has numerous punctures and tears
caused by contractor foot traffic. What is the appropriate regulatory action?
A. Approve the footing inspection immediately since vapor retarders have no structural bearing
significance
B. Require the contractor to repair or replace all damaged sections of the vapor retarder prior to concrete
placement to prevent moisture migration and subsequent slab distortion
C. Issue a stop-work order for the entire structural steel frame package
,D. Instruct the contractor to paint over the tears with latex wall paint before pouring concrete
Correct Answer: B. Require the contractor to repair or replace all damaged sections of the
vapor retarder prior to concrete placement to prevent moisture migration and subsequent
slab distortion
IBC Section 1907 and related reference standards require vapor retarders beneath slabs-on-
grade to be intact to control capillary moisture transfer, which can induce severe differential
movement in expansive soils.
3. An inspector is reviewing structural steel shop drawings for a multi-story Group S-1
warehouse. The fabricator proposes using high-strength bolts tightened by the turn-of-nut
method. Which inspection verification is mandatory during the installation of these bolts to
ensure proper pretensioning?
A. Visual verification that the plumber has aligned all sanitary drain cleanouts properly
B. Verification that the pre-installation verification testing was performed on-site using a calibrated
tension measuring device for each fastener lot
C. Measuring the electrical resistance of the bolt threads using a multimeter
D. Confirming that every bolt head has been painted red by the ironworker foreman
Correct Answer: B. Verification that the pre-installation verification testing was performed
on-site using a calibrated tension measuring device for each fastener lot
RCSC specifications and IBC Chapter 17 require periodic or continuous special inspection of
high-strength bolting, including mandatory pre-installation verification testing on-site to
verify that the rotation required for the turn-of-nut method achieves correct bolt tension.
4. A commercial building inspector arrives to inspect the structural masonry foundation
walls of a Group F-1 industrial facility. The masonry units are concrete masonry units
(CMUs) with vertical steel reinforcement. The masonry contractor has placed grout in lifts
of 12 feet without intermediate cleanouts. What is the code violation?
A. Grout lifts exceeding the maximum allowable height specified in TMS 402/602 without cleanouts are
prohibited because high lifts prevent visual confirmation of proper grout consolidation and core filling.
B. CMU walls are never permitted to contain vertical steel reinforcing bars in industrial facilities.
C. Grout must always be poured at temperatures below freezing.
D. Vertical reinforcement must be placed on the exterior face of the building only.
, Correct Answer: A. Grout lifts exceeding the maximum allowable height specified in TMS
402/602 without cleanouts are prohibited because high lifts prevent visual confirmation of
proper grout consolidation and core filling.
TMS 602 (Specification for Masonry Structures) sets strict limits on maximum grout pour
heights and lift heights to ensure complete consolidation and prevent voids around reinforcing
steel.
5. During a framing inspection of a Type IA high-rise apartment building, the inspector
notes that spray-applied fire-resistive material (SFRM) has been applied to structural steel
columns. The architectural specifications require a 2-hour fire-resistance rating. What field
test method is typically utilized by special inspectors to verify the thickness of the applied
SFRM?
A. Core drilling the steel column with a diamond saw
B. Measuring thickness using pin probes with washers inserted perpendicularly into the material until
contacting the steel substrate
C. Weighing the entire column on a portable digital scale
D. Measuring ambient air temperature with a mercury thermometer
Correct Answer: B. Measuring thickness using pin probes with washers inserted
perpendicularly into the material until contacting the steel substrate
AWCI and IBC standards outline thickness verification procedures for spray-applied fire-
resistive materials using pin probes to ensure the applied thickness meets or exceeds the code-
mandated hourly rating.
6. A commercial building inspector is reviewing the means of egress for a large assembly
occupancy (Group A-1) with an occupant load of 850 people. According to the IBC, what is
the minimum required total width in inches for stairways serving as a means of egress
component if the stairs are not sprinkled or equipped with an emergency voice/alarm
communication system?
A. 85 inches
B. 170 inches
C. 255 inches
D. 340 inches
Correct Answer: C. 255 inches
IBC Section 1005.3.1 sets the egress width factor for stairways at 0.3 inches per occupant for
buildings without sprinkler systems or voice/alarm systems ($850 \times 0.3 = 255$ inches).
AND ANSWERS | VERIFIED AND WELL DETAILED ANSWERS
PLUS RATIONALES | GUARANTEED PASS | LATEST EXAM
UPDATE | EXAM PREP | STUDY GUIDE | PRACTICE TEST |
DOWNLOAD INSTANT PDF
1. During the plan review of a newly proposed Type IIIB commercial mercantile building,
the design professional specifies exterior walls constructed entirely of fire-retardant-
treated wood framing. According to the International Building Code (IBC), what specific
documentation must be provided to the building official prior to the issuance of the
building permit to verify compliance of this material?
A. A written certification from the structural engineer of record stating that the wood was stored indoors
during transit
B. Identification marks stamped on each piece of lumber by an accredited agency indicating conformance
with AWPA standards and information regarding pressure treatment and fire performance
C. A receipt from the local lumber yard showing the purchase date and total board footage acquired for
the project
D. An affidavit signed by the building owner promising to inspect the wood annually for termite
infestation
Correct Answer: B. Identification marks stamped on each piece of lumber by an accredited
agency indicating conformance with AWPA standards and information regarding pressure
treatment and fire performance
IBC Chapter 23 mandates that fire-retardant-treated wood bear identification marks from an
approved agency showing compliance with applicable standards, ensuring the material
achieves the required flame spread index and structural integrity under fire conditions.
2. A commercial building inspector is conducting a footing inspection for a Group B office
building founded on expansive clay soils. The structural drawings require a monolithic
slab-on-grade designed in accordance with PTI standards. Upon arriving at the site, the
inspector notices that the perimeter vapor retarder has numerous punctures and tears
caused by contractor foot traffic. What is the appropriate regulatory action?
A. Approve the footing inspection immediately since vapor retarders have no structural bearing
significance
B. Require the contractor to repair or replace all damaged sections of the vapor retarder prior to concrete
placement to prevent moisture migration and subsequent slab distortion
C. Issue a stop-work order for the entire structural steel frame package
,D. Instruct the contractor to paint over the tears with latex wall paint before pouring concrete
Correct Answer: B. Require the contractor to repair or replace all damaged sections of the
vapor retarder prior to concrete placement to prevent moisture migration and subsequent
slab distortion
IBC Section 1907 and related reference standards require vapor retarders beneath slabs-on-
grade to be intact to control capillary moisture transfer, which can induce severe differential
movement in expansive soils.
3. An inspector is reviewing structural steel shop drawings for a multi-story Group S-1
warehouse. The fabricator proposes using high-strength bolts tightened by the turn-of-nut
method. Which inspection verification is mandatory during the installation of these bolts to
ensure proper pretensioning?
A. Visual verification that the plumber has aligned all sanitary drain cleanouts properly
B. Verification that the pre-installation verification testing was performed on-site using a calibrated
tension measuring device for each fastener lot
C. Measuring the electrical resistance of the bolt threads using a multimeter
D. Confirming that every bolt head has been painted red by the ironworker foreman
Correct Answer: B. Verification that the pre-installation verification testing was performed
on-site using a calibrated tension measuring device for each fastener lot
RCSC specifications and IBC Chapter 17 require periodic or continuous special inspection of
high-strength bolting, including mandatory pre-installation verification testing on-site to
verify that the rotation required for the turn-of-nut method achieves correct bolt tension.
4. A commercial building inspector arrives to inspect the structural masonry foundation
walls of a Group F-1 industrial facility. The masonry units are concrete masonry units
(CMUs) with vertical steel reinforcement. The masonry contractor has placed grout in lifts
of 12 feet without intermediate cleanouts. What is the code violation?
A. Grout lifts exceeding the maximum allowable height specified in TMS 402/602 without cleanouts are
prohibited because high lifts prevent visual confirmation of proper grout consolidation and core filling.
B. CMU walls are never permitted to contain vertical steel reinforcing bars in industrial facilities.
C. Grout must always be poured at temperatures below freezing.
D. Vertical reinforcement must be placed on the exterior face of the building only.
, Correct Answer: A. Grout lifts exceeding the maximum allowable height specified in TMS
402/602 without cleanouts are prohibited because high lifts prevent visual confirmation of
proper grout consolidation and core filling.
TMS 602 (Specification for Masonry Structures) sets strict limits on maximum grout pour
heights and lift heights to ensure complete consolidation and prevent voids around reinforcing
steel.
5. During a framing inspection of a Type IA high-rise apartment building, the inspector
notes that spray-applied fire-resistive material (SFRM) has been applied to structural steel
columns. The architectural specifications require a 2-hour fire-resistance rating. What field
test method is typically utilized by special inspectors to verify the thickness of the applied
SFRM?
A. Core drilling the steel column with a diamond saw
B. Measuring thickness using pin probes with washers inserted perpendicularly into the material until
contacting the steel substrate
C. Weighing the entire column on a portable digital scale
D. Measuring ambient air temperature with a mercury thermometer
Correct Answer: B. Measuring thickness using pin probes with washers inserted
perpendicularly into the material until contacting the steel substrate
AWCI and IBC standards outline thickness verification procedures for spray-applied fire-
resistive materials using pin probes to ensure the applied thickness meets or exceeds the code-
mandated hourly rating.
6. A commercial building inspector is reviewing the means of egress for a large assembly
occupancy (Group A-1) with an occupant load of 850 people. According to the IBC, what is
the minimum required total width in inches for stairways serving as a means of egress
component if the stairs are not sprinkled or equipped with an emergency voice/alarm
communication system?
A. 85 inches
B. 170 inches
C. 255 inches
D. 340 inches
Correct Answer: C. 255 inches
IBC Section 1005.3.1 sets the egress width factor for stairways at 0.3 inches per occupant for
buildings without sprinkler systems or voice/alarm systems ($850 \times 0.3 = 255$ inches).
