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| Section | Objectives |
|---|---|
| Mass Timber Materials | - CLT, Glulam, NLT, SCL and Engineered Wood Products |
| Construction Fire Safety | |
| Fire-Resistance & Protection | - Fire-Resistance-Rated Assemblies - Noncombustible Protection & Encapsulation - Concealed Spaces Protection |
| General & Construction Types | - Construction Classification โ Type IV-A, IV-B, IV-C
|
| Structural & Connection Inspection | - Connection Design and Protection - Framing and Structural Elements |
| Inspection Duties & Documentation | - Statement of Special Inspections - Inspection Reporting and Compliance Verification |
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NEW QUESTION # 77
Are mass timber elements permitted to serve as a fire barrier to an adjacent occupancy if they are separated from the interior of the building with an approved thermal barrier consisting of a minimum of 1/2 in. gypsum board or a noncombustible equivalent?
Answer: B
Explanation:
Yes. The allowance applies to both Type IV-B and Type IV-C construction , making option D correct.
IBC Section 508.4.4.1 regulates the construction of required separations between adjacent occupancies.
Where the required separation is formed by a fire barrier or horizontal assembly, mass timber elements are specifically permitted to serve that function in Type IV-B or Type IV-C construction provided the mass timber is separated from the building interior by an approved thermal barrier.
The prescribed thermal barrier is gypsum board not less than 1/2 inch thick , or another material that has been tested and meets both the Temperature Transmission Fire Test and Integrity Fire Test acceptance criteria of NFPA 275.
The requirement is supplemental to the actual fire-resistance rating required for the occupancy separation. In other words, simply installing 1/2-inch gypsum board does not independently create the required fire barrier; the underlying mass timber assembly must also provide the applicable rated performance.
Type IV-HT is not included in this specific Section 508.4.4.1 mass timber allowance.
References/Topics: 2021 IBC Section 508.4.4.1; Type IV-B and IV-C occupancy separations; NFPA 275 thermal barriers.
NEW QUESTION # 78
The fire-resistance of a protected mass timber assembly is equivalent to the fire resistance time of the:
Answer: D
Explanation:
The fire resistance of a protected mass timber element is determined by adding the inherent fire resistance of the mass timber to the protection time contributed by the approved noncombustible protection. Therefore, option D is correct.
The mass timber component provides structural endurance through its large cross section and predictable charring behavior. The noncombustible protection delays heating, ignition, and charring of the protected timber surfaces. Its contribution may be established by testing or by assigned values permitted under IBC Section 722.7. The combined value must equal or exceed the rating required for the building element.
Option A ignores the additional protection contribution. Option B ignores the structural endurance provided by the timber after the protective membrane has performed its assigned function. Option C incorrectly substitutes "finish rating time." A finish rating measures temperature rise behind a protective membrane and is not automatically the same as the added fire-resistance contribution established for protected mass timber.
Inspection must confirm that the protection system matches the approved calculation or tested configuration, including material type, thickness, layer count, fastening, edge treatment, joints, penetrations, and continuity.
References/Topics: 2021 IBC Sections 703.6, 703.8 and 722.7; protected mass timber performance method and noncombustible protection contribution.
NEW QUESTION # 79
Concealed spaces in a Type IV-C building must be protected with:
Answer: A
Explanation:
In Type IV-C construction, combustible construction forming concealed spaces must receive noncombustible protection providing an assigned time of at least 40 minutes. Consequently, option D is correct.
Type IV-C permits substantial portions of mass timber to remain exposed within occupied interior spaces, subject to the applicable construction and fire-resistance requirements. That permission does not extend unchanged into concealed spaces. Concealed combustible surfaces create a different hazard because fire can spread above ceilings, inside shafts, or within service cavities without immediate detection. Section 602.4.3.5 therefore imposes a specific 40-minute noncombustible protection requirement.
An NFPA 13 sprinkler system is generally required for tall mass timber buildings, but sprinkler protection alone is not the prescribed substitute for this concealed-space protection. Fire-retardant-treated wood is still combustible and does not constitute the required noncombustible protective membrane. Option C is also incorrect because the concealed-space rule is more specific than the provisions governing exposed surfaces in occupied spaces.
Inspection should occur before closure so that membrane continuity, board orientation, fastener spacing, joint treatment, penetrations, and protection around connection hardware can be fully observed.
References/Topics: 2021 IBC Sections 602.4.3.2 and 602.4.3.5; Table 722.7.1(1); concealed combustible construction in Type IV-C buildings.
NEW QUESTION # 80
What fire-resistance rating is required for Type IV-C exterior and interior bearing walls?
Answer: A
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 # 81
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: B
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 # 82
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