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| Section | Objectives |
|---|---|
| Topic 1: Fire-Resistance & Protection | - Fire-Resistance-Rated Assemblies - Concealed Spaces Protection - Noncombustible Protection & Encapsulation |
| Topic 2: General & Construction Types | - Construction Classification โ Type IV-A, IV-B, IV-C
|
| Topic 3: Construction Fire Safety | |
| Topic 4: Structural & Connection Inspection | - Connection Design and Protection - Framing and Structural Elements |
| Topic 5: Mass Timber Materials | - CLT, Glulam, NLT, SCL and Engineered Wood Products |
| Topic 6: Inspection Duties & Documentation | - Statement of Special Inspections - Inspection Reporting and Compliance Verification |
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NEW QUESTION # 28
The maximum allowable height for a Group I-4 building of Type IV-B construction provided with an automatic sprinkler system in accordance with Section 903.3.1.1 is _____ ft.
Answer: B
Explanation:
The applicable requirement is found in 2021 IBC Section 504.3 and Table 504.3. The table regulates building height in feet above grade plane by occupancy, construction type, and sprinkler condition. For a Group I-4 occupancy equipped throughout with a Section 903.3.1.1 sprinkler system, the applicable row is the sprinklered "S" row.
Reading across that row to Type IV-B construction gives a maximum building height of 120 feet. Therefore, option B is correct. The 180-foot value applies to Type IV-A construction for the same occupancy and sprinkler condition. The 85-foot value, which is not offered, applies to Type IV-C and Type IV-HT. The 270- foot value generally appears for certain lower-hazard occupancies-such as Groups A, B, E, F, M, S and U- when constructed as sprinklered Type IV-A, but it is not permitted for Group I-4.
This distinction reflects the additional life-safety considerations associated with custodial-care occupancies. A special inspector should verify that the approved construction documents identify both the correct occupancy classification and construction type because either classification directly changes the permitted height.
References/Topics: 2021 IBC Section 504.3; Table 504.3, Group I-4, sprinklered Type IV-B construction; Section 903.3.1.1.
NEW QUESTION # 29
Which of the following is true regarding Type IV-B unprotected portions of mass timber ceilings and walls?
Answer: B
Explanation:
Type IV-B construction is fundamentally protected mass timber construction, but the 2021 IBC permits specifically limited areas of interior mass timber to remain exposed. Section 602.4.2.2.2 establishes two independent exposure limits. Unprotected portions of mass timber ceilings, including attached beams, are limited to 20 percent of the floor area of the dwelling unit or fire area. Unprotected portions of mass timber walls, including attached columns, are limited to 40 percent of that floor area . Accordingly, option C correctly states the permitted percentages.
These percentages do not operate in isolation. Exposed areas must also comply with Section 602.4.2.2.4, which establishes separation requirements between unprotected mass timber surfaces. Where both walls and ceilings are exposed within the same dwelling unit or fire area, Section 602.4.2.2.3 requires use of the mixed- unprotected-area equation rather than independently maximizing both percentages.
Option A describes neither Type IV-B nor its controlled-exposure concept. Option B incorrectly characterizes Type IV-B as requiring complete encapsulation. Option D reverses the ceiling and wall percentages.
References/Topics: 2021 IBC Sections 602.4.2.2.2, 602.4.2.2.3 and 602.4.2.2.4; Type IV-B permitted exposed mass timber.
NEW QUESTION # 30
Refer to the exhibit by clicking on the EXHIBIT button above.
In the detail shown, what is the required tolerance in inches between the steel beam web and CLT?
Answer: B
Explanation:
The construction detail identifies a 1/2-inch tolerance between the steel beam web and the adjacent CLT panel. Therefore, option B is correct.
This is principally a construction-document interpretation question rather than a generic prescriptive IBC dimension. The 2021 IBC does not establish one universal steel-web-to-CLT clearance applicable to every mass timber connection. The required clearance is project specific and is established by the registered design professional through the approved structural drawings and connection details.
The tolerance provides erection clearance for placement of the prefabricated CLT around the steel member while accounting for fabrication and installation variation. It must not be arbitrarily reduced or increased because the gap can affect panel fit, bearing conditions, fastener alignment, fire-protection continuity, acoustic treatment and any specified joint-filling material.
Under the special-inspection framework, the inspector must compare the installed connection directly with the approved construction documents. Any condition that does not maintain the specified 1/2-inch clearance-or any undocumented field modification to the CLT or steel connection-must be reported and resolved through the registered design professional rather than accepted solely on the contractor's direction.
References/Topics: Approved structural details; 2021 IBC Sections 1704.2 and 1705.5; inspection of mass timber erection, anchorage and connections.
NEW QUESTION # 31
Regarding water supply for the protection of buildings under construction, when combustible building materials of the building under construction are delivered to a site, the minimum fire flow provided shall be
_____ gpm.
Answer: C
Explanation:
The required minimum fire flow is 500 gallons per minute , making option C correct.
2021 IFC Section 3313.1 requires an approved temporary or permanent water supply for fire protection to become available at specified stages of construction, including when combustible building materials arrive on the site. Section 3313.2 then establishes the specific requirement: when combustible building materials for the building under construction are delivered, a minimum fire flow of 500 gpm must be provided.
The hydrant supplying this flow must be located within 500 feet of the combustible building materials as measured along an approved fire apparatus access lane. If a single hydrant cannot provide the required coverage because of site configuration, additional hydrants are required.
The 500-gpm value in this question is the construction-stage minimum associated with combustible-material delivery. It should not be mistaken for the final required fire flow of the completed building. Depending on construction type, fire separation distance, building area, and subsequent phases of vertical construction, the required available water supply can be greater.
For mass timber projects, verifying this water supply before large timber packages arrive is a critical construction-phase fire-safety control.
References/Topics: 2021 IFC Sections 3313.1 and 3313.2; combustible building materials; minimum construction fire flow.
NEW QUESTION # 32
The International Building Code requires cross-laminated timber (CLT) to be manufactured and identified in accordance with which standard?
Answer: A
Explanation:
The governing standard is ANSI/APA PRG 320, Standard for Performance-Rated Cross-Laminated Timber.
Therefore, option A is correct. The 2021 IBC requires structural glued cross-laminated timber to be manufactured and identified in accordance with PRG 320, and Type IV provisions require CLT to bear a label demonstrating conformity with that standard.
PRG 320 addresses essential manufacturing and qualification requirements, including panel construction, layup, structural performance, adhesive qualification, dimensional tolerances, product marking and quality assurance. Product identification is particularly important to the special inspector because visual similarity alone does not establish that a panel is code compliant.
DOC PS 2 applies primarily to wood structural panels such as plywood and oriented strand board and is not the manufacturing standard for CLT. ANSI/AITC or ANSI/APA A190.1 applies to structural glued-laminated timber, commonly called glulam. ASTM D5055 covers the establishment and monitoring of structural capacities for prefabricated wood I-joists.
The inspector should verify that CLT panels retain legible identification and that the manufacturer, grade, layup and panel designation correspond to the approved construction documents.
References/Topics: 2021 IBC Sections 602.4 and 2303.1.4; Chapter 35; ANSI/APA PRG 320-2019.
NEW QUESTION # 33
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