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| Section | Objectives |
|---|---|
| Topic 1: Mass Timber Materials | - CLT, Glulam, NLT, SCL and Engineered Wood Products |
| Topic 2: Construction Fire Safety | |
| Topic 3: Inspection Duties & Documentation | - Inspection Reporting and Compliance Verification - Statement of Special Inspections |
| Topic 4: Structural & Connection Inspection | - Connection Design and Protection - Framing and Structural Elements |
| Topic 5: General & Construction Types | - Construction Classification — Type IV-A, IV-B, IV-C
|
| Topic 6: Fire-Resistance & Protection | - Fire-Resistance-Rated Assemblies - Concealed Spaces Protection - Noncombustible Protection & Encapsulation |
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NEW QUESTION # 66
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: C
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 # 67
Which of the following provisions for mass timber used for interior exit and elevator hoistway enclosures is true?
Answer: A
Explanation:
Option A correctly reflects the required noncombustible protection for protected Type IV-A mass timber.
Under IBC Section 602.4.1.2.1, the noncombustible protection applied to interior faces of Type IV-A mass timber must contribute the protection time determined by the applicable provisions of Section 722.7, but not less than 80 minutes .
The broader Type IV provisions are particularly important for interior exit and elevator hoistway enclosures.
In qualifying tall mass timber buildings with an occupied floor more than 75 feet above the lowest level of fire department access, mass timber interior exit and elevator hoistway enclosures are permitted up to the specified height limits only where protected in accordance with Section 602.4.1.2. For a two-hour, 120- minute-rated enclosure, at least 80 minutes must therefore come from the prescribed noncombustible protection.
Type IV-B likewise uses an 80-minute minimum for protected interior mass timber, so option B ' s 40-minute value is incorrect. Type IV-C has different exposure allowances and shaft-protection provisions, but option C does not state the controlling tall-building enclosure requirement tested here. Type IV-HT is not governed by the Type IV-A tall mass timber enclosure protection rule.
References/Topics: 2021 IBC Sections 602.4 and 602.4.1.2 through 602.4.1.2.1; Section 722.7.
NEW QUESTION # 68
According to UL Fire Resistance Directory, a "finish rating" is the time:
Answer: C
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 # 69
Refer to the exhibit by clicking on the EXHIBIT button above.
Given: The connections between the glulam beam and CLT panels all require a fire-resistance rating of 2 hours, and wood cover is designed per AWC Technical Report 10 to provide the entire 2 hours of protection.
The bearing area between the CLT and glulam is the minimum required.
What are the minimum dimensions, in inches, for the wood block shown in red?
Answer: D
Explanation:
Under the illustrated connection detail, the minimum wood-block dimensions are 3 inches by 3 inches.
Therefore, option C is correct.
The block is part of the sacrificial wood-cover system used to protect the connection for the full two-hour fire- resistance period. It must provide sufficient timber beyond the protected connection region to account for calculated charring and the increased exposure that can develop at the interface between abutting wood members. Because the problem states that the CLT-to-glulam bearing area is already the minimum required, the primary members do not provide surplus material that can be credited as additional protection at that edge.
AWC connection-fire-design guidance requires the protective geometry to remain effective after the calculated char front advances. Char contraction can open a gap at abutting edges and expose material deeper in the connection than would occur on an uninterrupted planar surface. The 3-inch-by-3-inch block maintains the required protective envelope for the stated two-hour condition.
This dimension is specific to the illustrated configuration and assumptions; it is not a universal minimum for every mass timber connection. The inspector must verify the approved detail rather than substitute nominal blocking based solely on field availability.
References/Topics: AWC Technical Report 10; AWC Fire Design Specification provisions for wood-cover protection and char contraction at abutting members.
NEW QUESTION # 70
Each of the following is true regarding the fire-resistance rating for exterior bearing walls except:
Answer: A
Explanation:
Option A is the incorrect statement and therefore the required answer. Under 2021 IBC Table 601, an exterior bearing wall in Type IV-C construction requires a two-hour fire-resistance rating , not one hour.
The tall mass timber classifications progressively vary the degree of noncombustible protection and allowable exposure, but the structural fire-resistance requirements remain substantial. Type IV-A exterior bearing walls require three hours. Type IV-B exterior bearing walls require two hours. Type IV-C exterior bearing walls also require two hours. Thus, options B, C, and D correctly reproduce the Table 601 values.
The special inspector must also recognize that Table 601 is not necessarily the only rating criterion affecting an exterior wall. Exterior walls are additionally subject to the requirements associated with fire separation distance, particularly Table 705.5. Where another IBC provision requires a higher rating, that more restrictive condition controls.
For mass timber construction, compliance also depends on the prescribed protective system, member dimensions, connections, joints, intersections, and exterior-side protection. A wall cannot be accepted as compliant solely because the timber cross section appears substantial; it must conform to the approved rated design.
References/Topics: 2021 IBC Section 601; Table 601; Section 602.4; Table 705.5.
NEW QUESTION # 71
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