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| Section | Objectives |
|---|---|
| Construction Fire Safety | - International Fire Code requirements - Construction-phase fire safety requirements - Protection of mass timber during construction |
| Code Compliance and Related Requirements | - Sound transmission requirements - Documentation and verification of compliance - Energy code requirements applicable to mass timber buildings |
| Special Inspection Requirements | - Special inspection procedures for tall mass timber buildings - Inspector duties and responsibilities - Inspection of connections and protective materials |
| Structural Inspection | - Mass timber structural elements - Structural loads and related code requirements - Connections and fastening systems |
| Fire Protection and Fire-Resistance | - Fire-resistance requirements - Fire protection systems and related provisions - Noncombustible protection and protection of mass timber elements |
| Tall Mass Timber Building Code Provisions | - International Building Code requirements for tall mass timber construction - Mass timber materials and construction requirements - Types IV-A, IV-B and IV-C construction |
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NEW QUESTION # 57
Each of the following is true for special inspection of mass timber construction except:
Answer: B
Explanation:
Option A is the false statement. Under 2021 IBC Table 1705.5.3, bolted connections require periodic special inspection, not continuous special inspection.
The remaining three statements correspond directly to items contained in the table. Concealed connections are subject to periodic inspection. Erection of mass timber construction is also periodically inspected. For threaded fasteners, the inspector must periodically verify the use of pre-drilled holes where the approved design or manufacturer's installation requirements call for them.
The distinction between periodic and continuous inspection is fundamental. Periodic inspection means the special inspector observes the work at appropriate intervals sufficient to verify compliance. Continuous inspection requires the inspector to be present continuously during the performance of the regulated work.
Table 1705.5.3 reserves continuous inspection for the particularly installation-sensitive condition involving adhesive anchors installed horizontally or upwardly inclined to resist sustained tension loads.
For bolted connections, periodic inspection remains technically substantive. The inspector should verify bolt size and type, hole preparation, connection geometry, washers and nuts, required tightening, member condition, edge and end distances, and conformity with the approved structural drawings.
References/Topics: 2021 IBC Section 1705.5.3; Table 1705.5.3, Required Special Inspections of Mass Timber Construction.
NEW QUESTION # 58
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 # 59
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: D
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 # 60
Refer to the figure by clicking on the EXHIBIT button above.
In Type IV-B construction, unprotected portions of mass timber as shown in the Figure is limited to an area equal to not more than what percentage of the base floor area?
Answer: B
Explanation:
The highlighted exposed surfaces in this figure are mass timber wall surfaces . Under 2021 IBC Section
602.4.2.2.2, Exception 1.2, unprotected portions of Type IV-B mass timber walls, including attached columns, are permitted up to an area equal to 40 percent of the floor area in the applicable dwelling unit or fire area.
Option D is therefore correct.
This should be distinguished from the corresponding ceiling limitation. Unprotected mass timber ceilings, including attached beams, are limited to 20 percent of floor area. The larger 40-percent allowance applies specifically to wall exposure.
Where only wall surfaces are exposed, the allowable wall area is calculated directly from the base floor area.
For example, a 1,000-square-foot fire area would permit up to 400 square feet of exposed wall surface under this exception. However, Section 602.4.2.2.4 additionally requires unprotected wall portions to maintain the prescribed 15-foot separation from other applicable exposed wall or ceiling portions.
Where exposed walls and exposed ceilings occur together, the individual 40- and 20-percent limits cannot simply be maximized simultaneously; the mixed-exposure equation in Section 602.4.2.2.3 governs.
References/Topics: 2021 IBC Sections 602.4.2.2.2 through 602.4.2.2.4; Type IV-B wall exposure.
NEW QUESTION # 61
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: D
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 # 62
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