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| Section | Objectives |
|---|---|
| Topic 1: Fire-Resistance & Protection | - Concealed Spaces Protection - Fire-Resistance-Rated Assemblies - Noncombustible Protection & Encapsulation |
| Topic 2: General & Construction Types | - Construction Classification — Type IV-A, IV-B, IV-C
|
| Topic 3: Construction Fire Safety | |
| Topic 4: Mass Timber Materials | - CLT, Glulam, NLT, SCL and Engineered Wood Products |
| Topic 5: Inspection Duties & Documentation | - Statement of Special Inspections - Inspection Reporting and Compliance Verification |
| Topic 6: Structural & Connection Inspection | - Framing and Structural Elements - Connection Design and Protection |
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18. Frage
In mass timber construction of Type IV-C, the fire-resistance ratings of bearing walls are permitted to be reduced by _____ where supporting a roof only.
Antwort: D
Begründung:
The permitted reduction is one hour. Table 601 assigns a two-hour base fire-resistance rating to exterior and interior bearing walls in Type IV-C construction. Footnote "a" to the table permits the ratings of the primary structural frame and bearing walls to be reduced by one hour where those elements support a roof only.
Accordingly, a Type IV-C bearing wall that supports only roof construction may be assigned a one-hour rating after application of the permitted reduction. The allowance recognizes that the element is not carrying occupied floor levels above and therefore presents a lower consequence of progressive structural failure than a wall supporting one or more floors.
The reduction is not automatic merely because a bearing wall is located at the upper story. The approved structural documents must establish that the wall supports only the roof and does not carry floor loads, transfer loads, elevated mechanical platforms, occupied rooftop structures, or other construction that invalidates the condition.
Options A and B are not reductions specified by Table 601. Option D would eliminate the entire two-hour rating and is not permitted. The inspector should verify the applicable rating and the precise load path before accepting reduced fire protection at the top story.
References/Topics: 2021 IBC Table 601, Footnote "a"; Type IV-C bearing walls and roof-support rating reduction.
19. Frage
Sealants used to resist passage of air in construction Type IV-A, shall be in accordance with which of the following standards?
Antwort: A
20. Frage
Each of the following is true regarding the fire-resistance rating for exterior bearing walls except:
Antwort: D
Begründung:
Option A is the exception because the base fire-resistance rating for an exterior bearing wall in Type IV-C construction is two hours, not one hour. The values are established by 2021 IBC Table 601.
Type IV-A has the most stringent tall mass timber construction requirements and assigns a three-hour rating to exterior bearing walls. Type IV-B and Type IV-C each assign a two-hour rating. Consequently, options B, C, and D accurately state the Table 601 requirements, while option A understates the required rating by one hour.
The Table 601 value is the minimum construction-type rating. Exterior bearing walls must also comply with the exterior-wall requirements of Table 705.5 based on fire separation distance. Where another code provision requires a higher rating, the more restrictive requirement governs. The inspector must therefore avoid treating the two-hour Type IV-C value as an absolute maximum.
Field verification should include the approved wall assembly, mass timber dimensions, noncombustible exterior protection, membrane continuity, protection of connections, intersections, joints, and any required opening protection. An exterior bearing wall installed as a nominal one-hour assembly would not comply merely because the timber itself has substantial cross-sectional dimensions.
References/Topics: 2021 IBC Table 601; Sections 602.4 and 705.5; exterior bearing-wall ratings for Types IV- A, IV-B, and IV-C.
21. Frage
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:
Antwort: A
Begründung:
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.
22. Frage
Buildings of Types IV-A, IV-B, and IV-C construction designed to be greater than six stories above grade plane shall meet which of the following requirements for fire safety practices during construction?
Antwort: B
Begründung:
The 2021 IFC specifically requires standpipes to be provided in accordance with Section 3313 for Type IV-A, IV-B, and IV-C buildings designed to exceed six stories above grade plane. Therefore, option A is correct.
The code also requires a water supply for fire department operations, but it must be approved by the fire code official and fire chief; it is not described as a mandatory "portable water supply." This makes option B inaccurate. Where noncombustible protection is required, at least one layer-not two layers-must be installed on applicable building elements more than four levels below active mass timber construction before additional levels are erected. Option D therefore overstates the number of layers.
Required exterior wall coverings must similarly be installed more than four levels below active mass timber construction. Option C incorrectly substitutes two levels for the prescribed four-level threshold.
These provisions limit the amount of unprotected combustible construction exposed at one time and provide the fire department with usable suppression infrastructure as erection progresses. Inspection coordination should verify standpipe extension, hose-connection accessibility, water availability, the progression of passive protection, and exterior-wall covering installation.
References/Topics: 2021 IFC Section 3308.4 and Section 3313; fire safety during construction of tall mass timber buildings.
23. Frage
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