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| Section | Objectives |
|---|---|
| Tall Mass Timber Building Code Provisions | - Structural and Connection Requirements
- Special Inspection Requirements
|
>> 93-Tall-Mass-Timber-Buildings Exam Preparation <<
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NEW QUESTION # 74
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:
The 2021 IFC specifically requires standpipes to be provided in accordance with Section 3313 for Type IV-A, IV-B, and IV-C buildings designed to exceed six stories above grade plane. Therefore, option A is correct.
The code also requires a water supply for fire department operations, but it must be approved by the fire code official and fire chief; it is not described as a mandatory "portable water supply." This makes option B inaccurate. Where noncombustible protection is required, at least one layer-not two layers-must be installed on applicable building elements more than four levels below active mass timber construction before additional levels are erected. Option D therefore overstates the number of layers.
Required exterior wall coverings must similarly be installed more than four levels below active mass timber construction. Option C incorrectly substitutes two levels for the prescribed four-level threshold.
These provisions limit the amount of unprotected combustible construction exposed at one time and provide the fire department with usable suppression infrastructure as erection progresses. Inspection coordination should verify standpipe extension, hose-connection accessibility, water availability, the progression of passive protection, and exterior-wall covering installation.
References/Topics: 2021 IFC Section 3308.4 and Section 3313; fire safety during construction of tall mass timber buildings.
NEW QUESTION # 75
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: C
Explanation:
IBC Table 601, Footnote "a," permits a one-hour reduction in the required fire-resistance rating of the primary structural frame and bearing walls where those elements support a roof only. Option C is therefore correct.
For Type IV-C construction, the normal Table 601 requirement for bearing walls is two hours. Where a bearing wall qualifies as supporting only roof construction, application of the footnote permits that rating to be reduced from two hours to one hour.
The limitation "supporting a roof only" is critical. The reduction cannot be applied simply because a wall is located at the uppermost occupied level. If the wall carries a floor, mezzanine, transfer load, occupied rooftop structure, or another structural element beyond qualifying roof construction, the condition for the reduction is not satisfied.
Options A and B are not reductions prescribed by Table 601. Option D would effectively eliminate the entire normal two-hour Type IV-C bearing-wall rating, which the footnote does not permit.
For inspection purposes, the approved construction documents and structural load path must substantiate use of the reduction. The fire-protection installation should then be checked against the actual reduced rating specifically authorized by the design.
References/Topics: 2021 IBC Table 601, Footnote "a"; Type IV-C bearing walls supporting roof construction only.
NEW QUESTION # 76
Based on the definition of cross-laminated timber (CLT), panels are manufactured as follows:
Answer: D
Explanation:
The 2021 IBC definition of cross-laminated timber describes a prefabricated engineered wood product consisting of not less than three layers of solid-sawn lumber or structural composite lumber. The adjacent layers are cross oriented and bonded with structural adhesive to form a solid wood element. Accordingly, option C is correct.
Cross orientation means that the principal grain direction of one layer is arranged approximately perpendicular to that of the adjoining layer. This configuration distinguishes CLT from products in which all laminations run parallel, such as conventional glued-laminated timber. The cross-oriented layup provides two- way panel behavior, dimensional stability, and structural capacity in both principal directions.
Option A is incorrect because CLT must contain at least three layers. Option B describes a mechanically laminated product rather than structural glued CLT; nail-laminated timber uses mechanical fasteners, whereas code-compliant CLT uses structural adhesives and must conform to the applicable manufacturing standard.
Option D eliminates the defining cross-lamination characteristic and would instead describe a parallel- laminated product.
During inspection, the product label and certification documentation should be checked to confirm the panel was manufactured under the required quality-assurance program.
References/Topics: 2021 IBC Chapter 2 definition of "Cross-Laminated Timber"; Sections 602.4 and
2303.1.4; ANSI/APA PRG 320.
NEW QUESTION # 77
Refer to the exhibit by clicking on the EXHIBIT button above.
If the glulam beam and CLT panels all require a fire-resistance rating of 2 hours, what is the required fire- resistance rating in hours for the structural connections between the glulam and CLT?
Answer: C
Explanation:
The structural connections must maintain a fire-resistance rating corresponding to the required rating of the structural elements they connect. Because both the glulam beam and CLT panels require a two-hour fire- resistance rating, their connections must also provide two hours of fire resistance. Therefore, option C is correct.
Concealing steel hardware inside a timber member does not eliminate the fire-resistance requirement. Steel rapidly conducts heat and can lose strength, while timber surrounding a concealed connector can char, split, or withdraw from fasteners. The connection must consequently be protected through sufficient wood cover, noncombustible protection, tested assemblies, or an approved engineering analysis demonstrating acceptable connection temperatures and capacity for the entire required duration.
A three-hour rating is not required merely as a generalized safety factor; the code requires correspondence with the connected elements unless the approved design establishes another condition. A one-hour connection would create a premature weak point in the load path, and a zero-hour rating would be unacceptable simply because the hardware is hidden.
References/Topics: 2021 IBC Section 2304.10.1; fire-resistance rating of mass timber connections; protected concealed steel hardware.
NEW QUESTION # 78
Disregarding footnotes, which of the following is true regarding fire-resistance ratings of building elements per the International Building Code Table 601?
Answer: D
Explanation:
When the footnotes are disregarded, the fire-resistance ratings assigned to the principal building elements of Type IV-A construction correspond to those of Type I-A construction . Option A is therefore correct.
IBC Table 601 assigns both Type I-A and Type IV-A a 3-hour rating for the primary structural frame , 3 hours for exterior and interior bearing walls, 2 hours for floor construction and associated secondary structural members , and 1Β½ hours for roof construction and associated secondary structural members
. Interior nonbearing walls and partitions are generally rated zero by Table 601 unless another code provision requires a rating. Exterior nonbearing walls are governed separately based on fire separation distance.
The similarity in Table 601 ratings does not mean Type I-A and Type IV-A are otherwise equivalent construction types. Type I-A relies principally on noncombustible structural construction, whereas Type IV-A permits mass timber subject to the substantial noncombustible protection requirements of Section 602.4.1.
Types II-A, III-A, IV-C, and IV-HT have materially different Table 601 requirements, so options B, C, and D do not provide a complete rating match.
References/Topics: 2021 IBC Section 601 and Table 601; Types I-A and IV-A fire-resistance ratings.
NEW QUESTION # 79
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