Page 1 of 161
Tall Mass Timber Buildings Exam (National Certification Exam
93), ACTUAL EXAM COMPLETE 400 QUESTIONS AND VERIFIED
SOLUTIONS LATEST UPDATE THIS YEAR
Tall Mass Timber Buildings Exam (National Certification Exam 93), we will align every question
with the 2021 International Building Code (IBC), 2021 International Fire Code (IFC), and NFPA
221.
Exam Coverage: National Certification 93
• Building Classification: Distinguishing between Type IV-A, IV-B, and IV-C.
• Heights and Areas: Story limits, altitude limits, and occupancy-specific restrictions (IBC
Chapter 5).
• Fire-Resistance Ratings: Structural frame requirements, char calculations, and assembly
ratings (IBC Chapter 7).
• Protection of Timber: Encapsulation (Noncombustible Protection), gypsum
requirements, and adhesive standards (PRG 320).
• Fire Safety Systems: Sprinkler requirements (NFPA 13), standpipes, and fire-rated joints.
• Fire Walls & Barriers: High-challenge fire walls and membrane penetrations (NFPA 221).
Batch 1 (Questions 1–100)
1. Which construction type allows the greatest number of stories for a Group R-2 occupancy?
A) Type IV-C
B) Type IV-B
C) Type IV-A
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D) Type IV-HT
Answer: C
Rationale: Type IV-A allows up to 18 stories for Group R-2, whereas IV-B allows 12 and IV-C
allows 8.
2. Type IV-B construction allows a specific amount of exposed mass timber. What is the
maximum percentage of the floor area that can have exposed mass timber ceilings?
A) 10%
B) 20%
C) 35%
D) 50%
Answer: B
Rationale: IBC 602.4.2.2.2 limits the unprotected (exposed) area of mass timber ceilings to 20%
of the floor area in the dwelling unit or fire area.
3. In Type IV-A construction, what is the required Fire Resistance Rating (FRR) for the primary
structural frame?
A) 1 hour
B) 2 hours
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C) 3 hours
D) 4 hours
Answer: C
Rationale: Per Table 601, Type IV-A requires a 3-hour rating for the structural frame to ensure
stability during a "burn-out" scenario.
4. What is the minimum required thickness of a Cross-Laminated Timber (CLT) floor to be
considered equivalent to Type IV (Heavy Timber) construction?
A) 2 inches
B) 3 inches
C) 4 inches
D) 6 inches
Answer: C
Rationale: IBC 602.4 requires a minimum nominal thickness of 4 inches for floors to provide
necessary thermal mass.
5. According to NFPA 221, a "High Challenge Fire Wall" must be:
A) Made only of concrete.
B) Designed to remain standing even if the structure on either side collapses.
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C) Maximum 2-hour rated.
D) Used only in Type V construction.
Answer: B
Rationale: High challenge walls are designed for structural independence to prevent
progressive collapse during a fire.
6. Which adhesive standard must CLT meet to prevent "heat-induced delamination" in tall
mass timber buildings?
A) ASTM E119
B) ANSI/APA PRG 320
C) NFPA 251
D) UL 10C
Answer: B
Rationale: PRG 320 (2018/2021) contains specific fire testing for adhesives to ensure layers
don't separate when charred.
7. In Type IV-A construction, mass timber must be protected by "Noncombustible
Protection." What is the minimum time this protection must provide?
A) 40 minutes
Tall Mass Timber Buildings Exam (National Certification Exam
93), ACTUAL EXAM COMPLETE 400 QUESTIONS AND VERIFIED
SOLUTIONS LATEST UPDATE THIS YEAR
Tall Mass Timber Buildings Exam (National Certification Exam 93), we will align every question
with the 2021 International Building Code (IBC), 2021 International Fire Code (IFC), and NFPA
221.
Exam Coverage: National Certification 93
• Building Classification: Distinguishing between Type IV-A, IV-B, and IV-C.
• Heights and Areas: Story limits, altitude limits, and occupancy-specific restrictions (IBC
Chapter 5).
• Fire-Resistance Ratings: Structural frame requirements, char calculations, and assembly
ratings (IBC Chapter 7).
• Protection of Timber: Encapsulation (Noncombustible Protection), gypsum
requirements, and adhesive standards (PRG 320).
• Fire Safety Systems: Sprinkler requirements (NFPA 13), standpipes, and fire-rated joints.
• Fire Walls & Barriers: High-challenge fire walls and membrane penetrations (NFPA 221).
Batch 1 (Questions 1–100)
1. Which construction type allows the greatest number of stories for a Group R-2 occupancy?
A) Type IV-C
B) Type IV-B
C) Type IV-A
,Page 2 of 161
D) Type IV-HT
Answer: C
Rationale: Type IV-A allows up to 18 stories for Group R-2, whereas IV-B allows 12 and IV-C
allows 8.
2. Type IV-B construction allows a specific amount of exposed mass timber. What is the
maximum percentage of the floor area that can have exposed mass timber ceilings?
A) 10%
B) 20%
C) 35%
D) 50%
Answer: B
Rationale: IBC 602.4.2.2.2 limits the unprotected (exposed) area of mass timber ceilings to 20%
of the floor area in the dwelling unit or fire area.
3. In Type IV-A construction, what is the required Fire Resistance Rating (FRR) for the primary
structural frame?
A) 1 hour
B) 2 hours
,Page 3 of 161
C) 3 hours
D) 4 hours
Answer: C
Rationale: Per Table 601, Type IV-A requires a 3-hour rating for the structural frame to ensure
stability during a "burn-out" scenario.
4. What is the minimum required thickness of a Cross-Laminated Timber (CLT) floor to be
considered equivalent to Type IV (Heavy Timber) construction?
A) 2 inches
B) 3 inches
C) 4 inches
D) 6 inches
Answer: C
Rationale: IBC 602.4 requires a minimum nominal thickness of 4 inches for floors to provide
necessary thermal mass.
5. According to NFPA 221, a "High Challenge Fire Wall" must be:
A) Made only of concrete.
B) Designed to remain standing even if the structure on either side collapses.
, Page 4 of 161
C) Maximum 2-hour rated.
D) Used only in Type V construction.
Answer: B
Rationale: High challenge walls are designed for structural independence to prevent
progressive collapse during a fire.
6. Which adhesive standard must CLT meet to prevent "heat-induced delamination" in tall
mass timber buildings?
A) ASTM E119
B) ANSI/APA PRG 320
C) NFPA 251
D) UL 10C
Answer: B
Rationale: PRG 320 (2018/2021) contains specific fire testing for adhesives to ensure layers
don't separate when charred.
7. In Type IV-A construction, mass timber must be protected by "Noncombustible
Protection." What is the minimum time this protection must provide?
A) 40 minutes
