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| Section | Objectives |
|---|---|
| Topic 1: Tall Mass Timber Building Code Provisions | - Applicable Codes and References
- Fire Safety and Fire Resistance
|
>> 93-Tall-Mass-Timber-Buildings学習関連題 <<
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質問 # 81
Each of the following is true regarding the fire-resistance rating for exterior bearing walls except:
正解：C
解説：
Option A is the incorrect statement and therefore the required answer. Under 2021 IBC Table 601, an exterior bearing wall in Type IV-C construction requires a two-hour fire-resistance rating , not one hour.
The tall mass timber classifications progressively vary the degree of noncombustible protection and allowable exposure, but the structural fire-resistance requirements remain substantial. Type IV-A exterior bearing walls require three hours. Type IV-B exterior bearing walls require two hours. Type IV-C exterior bearing walls also require two hours. Thus, options B, C, and D correctly reproduce the Table 601 values.
The special inspector must also recognize that Table 601 is not necessarily the only rating criterion affecting an exterior wall. Exterior walls are additionally subject to the requirements associated with fire separation distance, particularly Table 705.5. Where another IBC provision requires a higher rating, that more restrictive condition controls.
For mass timber construction, compliance also depends on the prescribed protective system, member dimensions, connections, joints, intersections, and exterior-side protection. A wall cannot be accepted as compliant solely because the timber cross section appears substantial; it must conform to the approved rated design.
References/Topics: 2021 IBC Section 601; Table 601; Section 602.4; Table 705.5.
質問 # 82
Both surfaces of a two-hour-rated mass timber wall that serves as a required separation between a Group R and Group I-2 occupancy in a Type IV-C building must be protected by at least which of the following?
正解：D
解説：
The minimum additional protection is 1/2-inch gypsum board or an approved equivalent thermal barrier
, making option C correct.
The wall in the question functions as an occupancy separation. Under IBC Section 508.4.4.1, mass timber elements serving as fire barriers or horizontal assemblies separating occupancies in Type IV-B or IV-C construction must be separated from the building interior by an approved thermal barrier consisting of gypsum board at least 1/2 inch thick , or a material satisfying both applicable NFPA 275 thermal-barrier tests.
Because the wall separates two interior occupancies, each face is exposed to interior space; consequently, the thermal-barrier requirement applies to both surfaces .
This requirement must not be confused with the wall ' s two-hour fire-resistance rating. The underlying mass timber wall must independently satisfy the required two-hour assembly performance. The 1/2-inch gypsum protection is an additional thermal-barrier condition imposed because the rated separation is constructed of mass timber in Type IV-C.
Option D would provide substantially more gypsum protection than the specific occupancy-separation provision requires.
References/Topics: 2021 IBC Sections 508.4.4 and 508.4.4.1; Type IV-B/IV-C mass timber occupancy separations; approved thermal barriers; NFPA 275.
質問 # 83
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?
正解：C
解説：
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.
質問 # 84
Mass timber is allowed in which of the following International Building Code Construction Types?
正解：A
解説：
Mass timber can be incorporated into all five principal IBC construction types, although the extent and permitted application vary substantially. Therefore, option D is the technically complete answer.
Types III, IV and V provide the broadest opportunities for mass timber structural systems. Type III permits combustible interior building elements, Type IV is specifically organized around mass timber or noncombustible structural elements, and Type V permits structural elements of any material allowed by the code. Type IV includes the tall mass timber classifications IV-A, IV-B and IV-C, together with Type IV-HT.
Types I and II are predominantly noncombustible construction, but they are not absolute prohibitions against every wood or mass timber application. IBC Section 603 identifies permitted combustible materials in Types I and II. In addition, Table 601, Note c, permits heavy timber complying with Section 2304.11 for roof construction-including applicable primary structural frame members-where the required fire-resistance rating is one hour or less.
Consequently, the answer does not mean that a Type I or Type II building may be framed entirely with exposed mass timber. It means that code-compliant mass timber elements can be used in defined applications within each construction type.
References/Topics: 2021 IBC Sections 602.1-602.5 and 603.1; Table 601, Note c; Section 2304.11.
質問 # 85
Refer to the exhibit by clicking on the EXHIBIT button above.
In the detail shown, which fasteners require fire protection according to AWC Technical Report 10?
正解：B
解説：
The 1/2-inch lag screws attaching the structural steel ledger require fire protection, making option D correct. These fasteners are structural components of the ledger-to-CLT connection and therefore form part of the connection whose fire performance must be maintained for the required duration.
AWC Technical Report 10 states that wood structural connections-including their connectors, fasteners, and participating members-must be protected from fire exposure for the required fire-resistance time
. Protection may be provided by wood cover, fire-rated gypsum board, other approved materials, or a combination.
TR10 distinguishes structural connection fasteners from small fasteners used merely to hold sacrificial protection in place. The report specifically explains that fasteners attaching protective wood strips need not themselves be protected, provided they are sufficiently long to keep the protection in position throughout the required exposure.
In the illustrated ledger connection, the 1/2-inch lag screws transfer structural load between the steel ledger and CLT wall. Their thermal protection is therefore integral to maintaining connection capacity.
References/Topics: AWC Technical Report No. 10 Sections 4.5 and connection examples; thermal protection of structural connectors and fasteners.
質問 # 86
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