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| Section | Objectives |
|---|---|
| General & Construction Types | - Construction Classification โ Type IV-A, IV-B, IV-C
|
| Mass Timber Materials | - CLT, Glulam, NLT, SCL and Engineered Wood Products |
| Structural & Connection Inspection | - Connection Design and Protection - Framing and Structural Elements |
| Fire-Resistance & Protection | - Noncombustible Protection & Encapsulation - Concealed Spaces Protection - Fire-Resistance-Rated Assemblies |
| Construction Fire Safety | |
| Inspection Duties & Documentation | - Inspection Reporting and Compliance Verification - Statement of Special Inspections |
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NEW QUESTION # 17
All of the following combustible elements may be used in mass timber buildings except:
Answer: B
NEW QUESTION # 18
What fire-resistance rating is required for floors in Type IV-A, IV-B and IV-C construction?
Answer: C
Explanation:
IBC Table 601 requires floor construction and associated secondary structural members in Types IV-A, IV-B, and IV-C construction to have a two-hour fire-resistance rating. Therefore, option B is correct.
This requirement applies to the complete floor assembly, not only the timber panel. The required two-hour performance may be established through the calculated fire resistance of the mass timber, the contribution of approved noncombustible protection, or a permitted combination of both. Any topping, protective membrane, connection protection, and edge condition that forms part of the approved rated design must be installed accordingly.
The ratings for other building elements should not be transferred to the floor. A three-hour rating applies to the primary structural frame and bearing walls of Type IV-A, but its floor construction remains two hours.
Type IV-B and Type IV-C floors also require two hours, even though those construction types permit different degrees of exposed mass timber.
The special inspector must verify panel dimensions, approved layup, protection layers, joints, penetrations, connections, topping thickness, and other details that influence the floor's rated performance.
References/Topics: 2021 IBC Sections 601 and 602.4; Table 601, floor construction and associated secondary structural members.
NEW QUESTION # 19
In mass timber construction of Type IV-B, each of the following is suitable for use as fireblocking except:
Answer: C
Explanation:
A 7/16-inch wood structural panel does not satisfy the prescribed minimum thickness for fireblocking.
Therefore, option C is the exception.
IBC Section 718.2.1 permits one thickness of 23/32-inch wood structural panel where the joints are properly backed. A 7/16-inch panel is substantially thinner and cannot be substituted without an approved alternative- material determination. The code also recognizes one-half-inch gypsum board and properly installed batts or blankets of mineral wool or other approved materials.
Mass timber complying with Section 2304.11 is also permitted as fireblocking. Its large cross section provides resistance to the movement of flame, hot gases, and smoke through a concealed space that is at least equivalent to the nominal lumber traditionally accepted for this purpose.
The inspector must distinguish fireblocking from a tested firestop system. Fireblocking divides or interrupts concealed combustible cavities; it does not automatically protect a penetration through a fire-resistance-rated wall or floor. Installation must completely fill or close the required space, remain securely supported, and comply with requirements for joints, edges, penetrations, and mineral-fiber compression.
References/Topics: 2021 IBC Section 718.2.1; Section 2304.11; approved fireblocking materials in mass timber construction.
NEW QUESTION # 20
Refer to the exhibit by clicking on the EXHIBIT button above.
In the detail shown, if the connections between the glulam beam and CLT panels all require a fire-resistance rating of one (1) hour and the wood cover is designed per AWC Technical Report 10 to provide the entire 1 hour of protection, what is the minimum thickness and number of layers required for the locations shown in red?
Answer: D
Explanation:
Two layers of 5/8-inch Type X gypsum wallboard are required for the condition shown, so option D is correct. The relevant AWC TR10 connection-protection methodology distinguishes between outer gypsum layers and the base layer immediately adjacent to the connection .
For 5/8-inch Type X gypsum board, an outer layer contributes 40 minutes. However, when gypsum board is being relied upon as the complete thermal-separation protection for a connection, TR10 reduces the contribution of the final/base layer to 50 percent. Therefore, the base layer contributes 20 minutes , while the second, exterior layer contributes 40 minutes . The total is:
20 minutes + 40 minutes = 60 minutes .
That satisfies the one-hour required protection period.
This is why simply looking at the normal 40-minute contribution of one 5/8-inch Type X layer would be incorrect for this connection condition. TR10 expressly uses the reduced base-layer contribution when gypsum constitutes the connection protection. The same methodology shows that four 5/8-inch Type X layers are needed for 120 minutes: 20 + 40 + 40 + 40 = 140 minutes, satisfying two hours.
References/Topics: AWC Technical Report No. 10, Sections 4.4.2 and connection-protection examples. TR10 states that outer 5/8-inch Type X layers provide 40 minutes each while the base layer provides 20 minutes.
NEW QUESTION # 21
Sealants used to resist passage of air in construction Type IV-A, shall be in accordance with which of the following standards?
Answer: A
Explanation:
ASTM C920 is the required standard for sealants used under the IBC mass timber air-sealing provision.
Option C is therefore correct. Section 703.7 applies to Type IV-A construction and requires compliant sealant or adhesive at specified interfaces involving fire-resistance-rated mass timber elements.
The sealing requirement reduces the movement of air, heat, and combustion gases into gaps that could expose additional timber surfaces and undermine the rated performance assumed by the approved design. The sealant must not merely appear to close the opening; it must be the specified product and installed within its approved joint dimensions and substrate conditions.
ASTM A36 is a structural steel material specification. ASTM E119 establishes procedures for fire testing building construction and assemblies but does not qualify elastomeric sealant products. ASTM F1667 covers driven fasteners such as nails, spikes, and staples and has no application to this sealing requirement.
Under Section 1705.20, installation is subject to periodic special inspection where the Section 703.7 sealant is applied. Inspection should occur before concealment and confirm continuity, adhesion, backing, joint depth, surface cleanliness, and compliance with the approved documents.
References/Topics: 2021 IBC Sections 703.7 and 1705.20; Type IV-A construction; ASTM C920.
NEW QUESTION # 22
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