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| Section | Objectives |
|---|---|
| Topic 1: Tall Mass Timber Building Code Provisions | - Fire Safety and Fire Resistance
- Type IV Construction
|
>> International Code Council 93-Tall-Mass-Timber-Buildings Study Center <<
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NEW QUESTION # 21
For Type IV-A construction, noncombustible protection shall provide what fraction of the required fire- resistance rating for building elements?
Answer: A
Explanation:
The prescribed proportion is two-thirds , making option C correct. The relationship is demonstrated directly by IBC Table 722.7.1(1). A building element requiring a one-hour fire-resistance rating must receive 40 minutes of noncombustible protection; a two-hour element requires 80 minutes; and a three-hour-or-greater element requires 120 minutes. Each of those prescribed values represents two-thirds of the corresponding one-
, two-, or three-hour rating.
For Type IV-A specifically, Section 602.4.1.2 requires protection of the interior faces of all mass timber elements. Section 602.4.1.2.1 further states that the protection must contribute at least the time assigned in Table 722.7.1(1) and not less than 80 minutes .
The remaining portion of the required fire resistance is provided by the mass timber element itself. Thus, for a three-hour Type IV-A primary structural element, 120 minutes are provided through noncombustible protection and the timber must supply the remaining required endurance.
This two-component approach is fundamental to the Type IV-A fire-design methodology.
References/Topics: 2021 IBC Sections 602.4.1.2 and 602.4.1.2.1; Tables 601 and 722.7.1(1); protected Type IV-A mass timber.
NEW QUESTION # 22
Which of the following is true regarding fire-resistance rating protection provided by noncombustible covering material?
Answer: C
Explanation:
IBC Table 722.7.1(2) assigns a 40-minute protection contribution to 5/8-inch Type X gypsum board .
Therefore, option D is correct.
The same table assigns 25 minutes to 1/2-inch Type X gypsum board. Consequently, option B overstates the protection contribution of the thinner Type X panel. Ordinary gypsum board values appearing elsewhere in Section 722 cannot simply be substituted for the specific mass timber noncombustible protection values in Table 722.7.1(2). Options A and C therefore do not state the protection contribution recognized by the mass timber table.
These assigned values are particularly important when multiple layers are required. For example, a two-hour building element requires at least 80 minutes of noncombustible protection under Table 722.7.1(1), which can be satisfied prescriptively with two properly installed layers of 5/8-inch Type X gypsum board, each contributing 40 minutes.
The contribution is valid only when the gypsum board is installed and fastened in accordance with Section
722.7.2.
References/Topics: 2021 IBC Tables 722.7.1(1) and 722.7.1(2); Section 722.7.2; Type X gypsum noncombustible protection.
NEW QUESTION # 23
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?
Answer: C
Explanation:
Option A is an exact requirement of the 2021 International Fire Code Section 3303.5 . For Type IV-A, IV- B, and IV-C buildings designed to exceed six stories above grade plane, standpipes must be provided in accordance with IFC Section 3313, unless otherwise approved by the fire code official.
The IFC also requires a water supply for fire department operations, but that supply must be approved by the fire code official and fire chief; the code does not specifically mandate that it be a "portable" water supply.
Option B is therefore incorrect.
The remaining options alter important numerical requirements. Where noncombustible protection is required and construction exceeds six stories, at least one layer , not two, must be installed on applicable building elements more than four levels below active mass timber construction before additional floor levels are erected. Required exterior wall coverings are likewise required more than four levels below active mass timber construction, rather than two.
These safeguards reduce the amount of exposed combustible construction while ensuring that effective fire department infrastructure progresses with the building.
References/Topics: 2021 IFC Section 3303.5; Sections 3313 and related construction-stage fire protection requirements.
NEW QUESTION # 24
In Type IV-C construction, a connection between two members of the primary structural frame supporting a floor is required to be protected to achieve a minimum fire-resistance rating of:
Answer: C
Explanation:
The required minimum fire-resistance rating is two hours , making option C correct. Table 601 assigns a two- hour fire-resistance rating to the primary structural frame in Type IV-C construction. The structural connection between members of that rated frame cannot become a premature failure point in the load path.
IBC Section 2304.10.1 specifically addresses structural connections in Types IV-A, IV-B, and IV-C mass timber construction. Connection protection must provide the fire-resistance performance required for the connected building element. This can be accomplished through protected connection configurations, approved fire testing, or engineering analysis satisfying the applicable code criteria.
The connection includes more than the visible steel plate or bolt. Fasteners, connectors, concealed steel, bearing zones, and portions of the timber participating structurally in the connection must collectively maintain the required performance. A one-hour or 1½-hour connection would undermine a structural frame required to remain functional for two hours. Three hours is the primary-frame rating associated with Type IV- A, not the Type IV-C condition specified here.
The inspector should verify protection thickness, wood cover, gypsum layers, hardware embedment, edge conditions, and approved connection geometry before concealment.
References/Topics: 2021 IBC Table 601; Section 2304.10.1; fire-resistant structural connections in Types IV- A, IV-B, and IV-C.
NEW QUESTION # 25
According to UL Fire Resistance Directory, a "finish rating" is the time:
Answer: A
Explanation:
Option C correctly states the fundamental UL finish-rating criterion. UL defines a finish rating for assemblies containing combustible wood structural supports as the elapsed fire-exposure time at which the wood member immediately behind the protective membrane reaches the prescribed temperature-rise threshold.
More precisely, UL uses two criteria: an average temperature rise of 250°F or an individual-point temperature rise of 325°F , measured on the plane of the wood nearest the fire, typically between the gypsum membrane and the wood stud or joist. The question asks for the principal definition, which is the 250° F temperature-rise criterion; therefore, option C is correct. Option D incorrectly treats the 325°F individual- point limit as the sole definition.
Options A and B confuse a finish rating with "assigned protection time." IBC Tables 722.6 and 722.7 provide calculated contribution values for specified protective materials, but those assigned values are not themselves UL finish ratings.
This distinction matters in mass timber fire design because membrane contribution, thermal separation, structural fire resistance, and finish rating are related but not interchangeable concepts.
References/Topics: UL Fire Resistance Directory terminology; finish rating; average 250°F and individual
325°F temperature-rise criteria.
NEW QUESTION # 26
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