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| Section | Objectives |
|---|---|
| Structural & Connection Inspection | - Framing and Structural Elements - Connection Design and Protection |
| Inspection Duties & Documentation | - Statement of Special Inspections - Inspection Reporting and Compliance Verification |
| Fire-Resistance & Protection | - Noncombustible Protection & Encapsulation - Concealed Spaces Protection - Fire-Resistance-Rated Assemblies |
| Mass Timber Materials | - CLT, Glulam, NLT, SCL and Engineered Wood Products |
| Construction Fire Safety | |
| General & Construction Types | - Construction Classification — Type IV-A, IV-B, IV-C
|
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NEW QUESTION # 51
What fire-resistance rating is required for floors in Type IV-A, IV-B and IV-C construction?
Answer: A
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 # 52
Which of the following provisions for mass timber used for interior exit and elevator hoistway enclosures is true?
Answer: B
Explanation:
Option A correctly applies the protection requirements for mass timber used in qualifying interior exit and elevator hoistway enclosures. Where a two-hour, or 120-minute, fire-resistance rating is required, the noncombustible protection must contribute not less than two-thirds of that required rating. Two-thirds of 120 minutes is 80 minutes.
The 2021 IBC provisions for Type IV-A require interior mass timber surfaces to be protected with compliant noncombustible materials. The assigned protection time is determined under Section 722.7 and cannot be less than the applicable minimum. Option B is incorrect because 40 minutes would provide only one-third of a two-hour rating; Type IV-B protected mass timber generally requires at least 80 minutes for a two-hour element. Option C does not correctly describe the special protection path applicable to mass timber exit and hoistway enclosures. Option D is also incorrect because Type IV-HT is not governed by the tall mass timber enclosure provision stated in the question.
The inspector must verify the total assigned protection time, membrane type, number of layers, fastening, joints, corners, penetrations, and continuity on both required faces of the enclosure.
References/Topics: 2021 IBC Sections 602.4, 602.4.1.2 and 722.7.1; protection of mass timber shaft and exit enclosures.
NEW QUESTION # 53
According to UL Fire Resistance Directory, a "finish rating" is the time:
Answer: D
Explanation:
Option C correctly states the fundamental UL finish-rating criterion. UL defines a finish rating for assemblies containing combustible wood structural supports as the elapsed fire-exposure time at which the wood member immediately behind the protective membrane reaches the prescribed temperature-rise threshold.
More precisely, UL uses two criteria: an average temperature rise of 250°F or an individual-point temperature rise of 325°F , measured on the plane of the wood nearest the fire, typically between the gypsum membrane and the wood stud or joist. The question asks for the principal definition, which is the 250° F temperature-rise criterion; therefore, option C is correct. Option D incorrectly treats the 325°F individual- point limit as the sole definition.
Options A and B confuse a finish rating with "assigned protection time." IBC Tables 722.6 and 722.7 provide calculated contribution values for specified protective materials, but those assigned values are not themselves UL finish ratings.
This distinction matters in mass timber fire design because membrane contribution, thermal separation, structural fire resistance, and finish rating are related but not interchangeable concepts.
References/Topics: UL Fire Resistance Directory terminology; finish rating; average 250°F and individual
325°F temperature-rise criteria.
NEW QUESTION # 54
Refer to the figure by clicking on the EXHIBIT button above.
In Type IV-B construction, unprotected portions of mass timber as shown in the Figure is limited to an area equal to not more than what percentage of the base floor area?
Answer: C
Explanation:
The highlighted exposed surfaces in this figure are mass timber wall surfaces . Under 2021 IBC Section
602.4.2.2.2, Exception 1.2, unprotected portions of Type IV-B mass timber walls, including attached columns, are permitted up to an area equal to 40 percent of the floor area in the applicable dwelling unit or fire area.
Option D is therefore correct.
This should be distinguished from the corresponding ceiling limitation. Unprotected mass timber ceilings, including attached beams, are limited to 20 percent of floor area. The larger 40-percent allowance applies specifically to wall exposure.
Where only wall surfaces are exposed, the allowable wall area is calculated directly from the base floor area.
For example, a 1,000-square-foot fire area would permit up to 400 square feet of exposed wall surface under this exception. However, Section 602.4.2.2.4 additionally requires unprotected wall portions to maintain the prescribed 15-foot separation from other applicable exposed wall or ceiling portions.
Where exposed walls and exposed ceilings occur together, the individual 40- and 20-percent limits cannot simply be maximized simultaneously; the mixed-exposure equation in Section 602.4.2.2.3 governs.
References/Topics: 2021 IBC Sections 602.4.2.2.2 through 602.4.2.2.4; Type IV-B wall exposure.
NEW QUESTION # 55
Refer to the exhibit by clicking on the EXHIBIT button above.
In the detail shown, the 2x2 block is intended for what purpose according to AWC Technical Report 10?
Answer: D
Explanation:
The 2 × 2 block is intended to protect the abutting wood edges from the effects of char contraction. Therefore, option D is correct.
During fire exposure, wood chars and the char layer can shrink or contract. At an interface between two abutting timber components, that contraction can create a gap that allows heat and flames to penetrate deeper than predicted for a continuous exposed surface. AWC connection-fire-design methodology therefore requires additional protection at susceptible joints and interfaces. The block shields the abutting edges and maintains the sacrificial wood-cover path around the protected connection.
Its primary function is not decorative, nor is it simply an air-sealing component. Although limiting airflow can be a secondary consequence of closing the interface, the design purpose addressed by the technical guidance is control of premature fire penetration caused by char contraction. The block also should not be interpreted independently as a generic one-hour protective membrane for the steel ledger; the connection's total rating depends on the complete approved protection assembly.
The inspector should confirm the block's dimensions, species or product designation, fastening, continuity, and tight installation before the connection is concealed.
References/Topics: AWC Technical Report 10; AWC Fire Design Specification provisions addressing char contraction and gaps between abutting wood members.
NEW QUESTION # 56
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