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| Section | Objectives |
|---|---|
| Topic 1: Tall Mass Timber Building Code Provisions | - Type IV Construction
- Special Inspection Requirements
|
>> Test 93-Tall-Mass-Timber-Buildings Questions <<
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NEW QUESTION # 46
For Type IV-A, IV-B, and IV-C construction, each of the following materials on the exterior side of mass timber exterior walls is required to be noncombustible except:
Answer: C
Explanation:
The code provides a specific combustible-material exception for qualifying water-resistive barriers , making option D correct. The exterior-protection provisions for Types IV-A, IV-B, and IV-C require the exterior side of mass timber walls to receive noncombustible protection with at least a 40-minute assigned protection time, and components of the exterior wall covering are generally required to be noncombustible.
A water-resistive barrier may be combustible only where it satisfies stringent fire-performance criteria.
Among those criteria, the 2021 IBC limits peak heat-release rate and total heat release under ASTM E1354 and establishes flame-spread and smoke-developed limits under ASTM E84 or UL 723. The provision therefore does not create a blanket exemption for arbitrary combustible membranes.
Insulation, exterior cladding, and architectural components forming part of the regulated exterior wall covering must comply with the applicable noncombustibility requirements unless some other express code allowance applies. The WRB is the specifically identified exception tested by this question.
During inspection, product identification and fire-test documentation should be checked rather than assuming that a membrane qualifies merely because it is marketed as a water-resistive barrier.
References/Topics: 2021 IBC Sections 602.4.1.1, 602.4.2.1 and 602.4.3.1; exterior wall protection and qualifying water-resistive barriers.
NEW QUESTION # 47
Both surfaces of a two-hour-rated mass timber wall that serves as a required separation between a Group R and Group I-2 occupancy in a Type IV-C building must be protected by at least which of the following?
Answer: B
Explanation:
The minimum additional protection is 1/2-inch gypsum board or an approved equivalent thermal barrier
, making option C correct.
The wall in the question functions as an occupancy separation. Under IBC Section 508.4.4.1, mass timber elements serving as fire barriers or horizontal assemblies separating occupancies in Type IV-B or IV-C construction must be separated from the building interior by an approved thermal barrier consisting of gypsum board at least 1/2 inch thick , or a material satisfying both applicable NFPA 275 thermal-barrier tests.
Because the wall separates two interior occupancies, each face is exposed to interior space; consequently, the thermal-barrier requirement applies to both surfaces .
This requirement must not be confused with the wall ' s two-hour fire-resistance rating. The underlying mass timber wall must independently satisfy the required two-hour assembly performance. The 1/2-inch gypsum protection is an additional thermal-barrier condition imposed because the rated separation is constructed of mass timber in Type IV-C.
Option D would provide substantially more gypsum protection than the specific occupancy-separation provision requires.
References/Topics: 2021 IBC Sections 508.4.4 and 508.4.4.1; Type IV-B/IV-C mass timber occupancy separations; approved thermal barriers; NFPA 275.
NEW QUESTION # 48
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 are required to be separated by _____ feet.
Answer: D
Explanation:
The required separation is 15 feet , making option B correct. Section 602.4.2.2.4 of the 2021 IBC specifically regulates the separation distance between unprotected mass timber elements in Type IV-B construction.
Within each dwelling unit or fire area, unprotected portions of mass timber walls and ceilings must be separated from other unprotected wall and ceiling portions by not less than 15 feet . For ceiling-related surfaces, the separation is measured horizontally along the ceiling. For wall-to-wall exposure, the applicable separation is measured horizontally along the floor.
This requirement operates in addition to the maximum exposed-area restrictions. A designer therefore cannot merely demonstrate that the exposed ceiling is below 20 percent or that exposed walls are below 40 percent of floor area; the exposed regions must also satisfy the required spatial separation.
The purpose is to prevent multiple exposed mass timber regions from acting as closely spaced fuel packages during a compartment fire. During inspection, dimensions should be checked against the approved documents before required gypsum or other noncombustible protection is completed.
References/Topics: 2021 IBC Section 602.4.2.2.4; separation distance between unprotected Type IV-B mass timber elements.
NEW QUESTION # 49
Which of the following products is not included in the definition of mass timber?
Answer: B
Explanation:
Prefabricated wood I-joists are engineered wood framing products, but they are not mass timber elements because their configuration does not meet the minimum solid cross-sectional dimensions required for Type IV mass timber construction. Option B is therefore correct.
An I-joist consists of relatively thin flanges connected by a thin structural web. Its efficient open- web-like cross section is fundamentally different from a large solid, laminated, built-up or panelized timber element. I- joists are separately regulated by IBC Section 2303.1.2 and are manufactured and evaluated in accordance with ASTM D5055.
Solid-sawn lumber can qualify as mass timber when it satisfies the minimum heavy-timber dimensions.
Structural glued-laminated timber is a recognized large-section engineered timber product, while cross- laminated timber is explicitly recognized as a panelized mass timber product and is regulated by ANSI/APA PRG 320.
The critical inspection point is that the term "engineered wood" does not automatically mean "mass timber." The special inspector must verify the product category, minimum dimensions, approved construction type, applicable product standard, identification marks and installation requirements shown in the approved construction documents.
References/Topics: 2021 IBC Chapter 2 definition of "Mass Timber"; Sections 2303.1.2, 2303.1.3, 2303.1.4 and 2304.11; ASTM D5055.
NEW QUESTION # 50
What fire-resistance rating is required for Type IV-C exterior and interior bearing walls?
Answer: D
Explanation:
IBC Table 601 requires both exterior and interior bearing walls in Type IV-C construction to have a minimum two-hour fire-resistance rating. Option B is correct.
For exterior bearing walls, the Table 601 rating is not the only applicable criterion. Section 602.1 also requires exterior walls to satisfy Table 705.5 based on occupancy and fire separation distance. Where Table 705.5 or another provision imposes a more restrictive rating, the higher requirement governs.
The two-hour rating may be achieved through the calculated structural fire resistance of the mass timber, approved noncombustible protection, or an approved combination of the two. Connections, intersections, penetrations, and abutting edges must not create a premature failure path or compromise the rated assembly.
A one-hour reduction can be permitted for bearing walls supporting a roof only under Table 601, Footnote
"a," but that exception does not apply to a wall carrying floors or other qualifying structural loads. The inspector must confirm the actual load path before accepting any reduced protection at the uppermost level.
References/Topics: 2021 IBC Sections 601, 602.1 and 602.4; Tables 601 and 705.5; Type IV-C bearing walls.
NEW QUESTION # 51
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