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| Section | Objectives |
|---|---|
| Topic 1: Tall Mass Timber Building Code Provisions | - Type IV Construction
- Special Inspection Requirements
|
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NEW QUESTION # 16
For a sprinklered Business Occupancy (Group B) in a 15-story building of Type IV-A construction, the maximum allowable building area is:
Answer: C
Explanation:
The calculation begins with 2021 IBC Table 506.2. Because the building is a Group B occupancy, has more than one story, and is protected throughout by an automatic sprinkler system complying with Section
903.3.1.1, the applicable tabular classification is "SM"-a multistory, fully sprinklered building.
For Group B and Type IV-A construction, Table 506.2 assigns an SM allowable area factor of 324,000 square feet. However, this is not the final total allowable building area. Section 506.2.1 requires a single-occupancy building with more than three stories above grade plane to use Equation 5-2. Where no frontage increase is stated, the calculation is:
324,000 square feet ร 3 = 972,000 square feet.
The story-area multiplier is limited to three even though the building contains 15 stories. The code does not permit multiplying 324,000 square feet by all 15 stories. Additionally, the actual area of an individual story cannot exceed its calculated allowable area. Option A represents a different construction-type area factor, while option B does not result from the required IBC multistory calculation. The building is not automatically unlimited merely because it is Type IV-A and sprinklered.
References/Topics: 2021 IBC Sections 506.2 and 506.2.1; Equation 5-2; Table 506.2, Group B, Type IV-A, SM area factor.
NEW QUESTION # 17
All of the following combustible elements may be used in mass timber buildings except:
Answer: B
Explanation:
A conventional 2 ร 6 solid-sawn stud is a light-frame member and does not satisfy the minimum cross- sectional dimensions associated with mass timber or heavy-timber construction. Therefore, option A is the exception.
The IBC defines mass timber as Type IV structural elements primarily composed of solid, built-up, panelized or engineered wood products that meet the minimum cross-sectional dimensions required for Type IV construction. A nominal 2 ร 6 stud is substantially smaller than those dimensions and is ordinarily classified as conventional light-frame construction. Its use might be permitted in a particular nonstructural partition or another specifically authorized application, but it is not itself a qualifying mass timber structural element.
CLT is expressly recognized as a mass timber panel product. Parallel-strand lumber is a form of structural composite lumber and can qualify where it satisfies the applicable minimum dimensions, product-standard requirements and approved structural design. Dowel-laminated timber is a built-up panelized timber product and may likewise serve as a mass timber element when its dimensions, engineering and approval satisfy the construction documents and code.
The classification depends on the completed element's dimensions and approved structural function-not merely on the fact that it is manufactured from wood.
References/Topics: 2021 IBC Chapter 2 definitions of "Mass Timber" and "Conventional Light-Frame Construction"; Sections 602.4 and 2304.11.
NEW QUESTION # 18
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: D
Explanation:
The figure depicts an unprotected portion of the mass timber ceiling . For Type IV-B construction, Section
602.4.2.2.2, Exception 1.1, limits unprotected ceiling areas-including attached mass timber beams-to 20 percent of the floor area of the applicable dwelling unit or fire area. Option B is therefore correct.
The percentage is based on floor area rather than total ceiling surface area. For example, where the associated fire area contains 1,000 square feet of floor area, the maximum ceiling exposure permitted under this particular exception would be 200 square feet, subject to the additional separation and mixed-exposure provisions.
The 40-percent value in option D applies to mass timber walls, including attached columns , rather than ceilings. The 15-percent and 30-percent values are not the prescribed Type IV-B ceiling exposure limitations in the 2021 IBC.
The inspector must additionally determine whether another exposed wall or ceiling region exists nearby.
Section 602.4.2.2.4 imposes a 15-foot separation requirement, and Section 602.4.2.2.3 controls situations where both wall and ceiling surfaces are intentionally exposed.
References/Topics: 2021 IBC Sections 602.4.2.2.2 through 602.4.2.2.4; Type IV-B ceiling exposure limitations.
NEW QUESTION # 19
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: B
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 # 20
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 # 21
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