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| Section | Objectives |
|---|---|
| Topic 1: Fire Protection and Fire-Resistance | - Fire protection systems and related provisions - Fire-resistance requirements - Noncombustible protection and protection of mass timber elements |
| Topic 2: Structural Inspection | - Structural loads and related code requirements - Connections and fastening systems - Mass timber structural elements |
| Topic 3: Code Compliance and Related Requirements | - Documentation and verification of compliance - Sound transmission requirements - Energy code requirements applicable to mass timber buildings |
| Topic 4: Construction Fire Safety | - International Fire Code requirements - Construction-phase fire safety requirements - Protection of mass timber during construction |
| Topic 5: Special Inspection Requirements | - Inspection of connections and protective materials - Inspector duties and responsibilities - Special inspection procedures for tall mass timber buildings |
| Topic 6: Tall Mass Timber Building Code Provisions | - Types IV-A, IV-B and IV-C construction - International Building Code requirements for tall mass timber construction - Mass timber materials and construction requirements |
>> Exam 93-Tall-Mass-Timber-Buildings Topics <<
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NEW QUESTION # 26
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.
Answer: A
Explanation:
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.
NEW QUESTION # 27
The fire-resistance of a protected mass timber assembly is equivalent to the fire resistance time of the:
Answer: C
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 # 28
Which of the following is true regarding Type IV-B unprotected portions of mass timber ceilings and walls?
Answer: A
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 # 29
In mass timber construction of Type IV-B, each of the following is suitable for use as fireblocking except:
Answer: B
Explanation:
A 7/16-inch wood structural panel is not one of the prescriptively acceptable fireblocking materials listed by IBC Section 718.2.1. Therefore, option C is correct.
Section 718.2.1 permits fireblocking to consist of several specified materials. These include one-half-inch gypsum board; properly secured batts or blankets of mineral wool, mineral fiber, or other approved materials; and mass timber complying with Section 2304.11. Options A, B, and D are consequently valid.
For wood structural panels, however, the IBC requires a substantially greater thickness: a single thickness of approximately 0.719 inch , conventionally represented as 23/32 inch, with joints backed by material of the same required thickness. A 7/16-inch panel is only approximately 0.438 inch thick and therefore does not satisfy that prescriptive fireblocking provision.
Fireblocking is intended to interrupt concealed draft openings and restrict the movement of flame and hot gases through concealed combustible spaces. It should not be confused with a tested firestop system used at penetrations through fire-resistance-rated assemblies.
Special inspection should confirm that the installed material, thickness, joint backing, retention, and location conform to the approved construction documents and the applicable code provision.
References/Topics: 2021 IBC Sections 718.2 and 718.2.1; Section 2304.11; permitted fireblocking materials.
NEW QUESTION # 30
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 # 31
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