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| Section | Objectives |
|---|---|
| Topic 1: Mass Timber Materials | - CLT, Glulam, NLT, SCL and Engineered Wood Products |
| Topic 2: Inspection Duties & Documentation | - Statement of Special Inspections - Inspection Reporting and Compliance Verification |
| Topic 3: Construction Fire Safety | |
| Topic 4: Structural & Connection Inspection | - Connection Design and Protection - Framing and Structural Elements |
| Topic 5: General & Construction Types | - Construction Classification — Type IV-A, IV-B, IV-C
|
| Topic 6: Fire-Resistance & Protection | - Fire-Resistance-Rated Assemblies - Noncombustible Protection & Encapsulation - Concealed Spaces Protection |
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質問 # 29
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?
正解：C
解説：
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.
質問 # 30
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 exception because the base fire-resistance rating for an exterior bearing wall in Type IV-C construction is two hours, not one hour. The values are established by 2021 IBC Table 601.
Type IV-A has the most stringent tall mass timber construction requirements and assigns a three-hour rating to exterior bearing walls. Type IV-B and Type IV-C each assign a two-hour rating. Consequently, options B, C, and D accurately state the Table 601 requirements, while option A understates the required rating by one hour.
The Table 601 value is the minimum construction-type rating. Exterior bearing walls must also comply with the exterior-wall requirements of Table 705.5 based on fire separation distance. Where another code provision requires a higher rating, the more restrictive requirement governs. The inspector must therefore avoid treating the two-hour Type IV-C value as an absolute maximum.
Field verification should include the approved wall assembly, mass timber dimensions, noncombustible exterior protection, membrane continuity, protection of connections, intersections, joints, and any required opening protection. An exterior bearing wall installed as a nominal one-hour assembly would not comply merely because the timber itself has substantial cross-sectional dimensions.
References/Topics: 2021 IBC Table 601; Sections 602.4 and 705.5; exterior bearing-wall ratings for Types IV- A, IV-B, and IV-C.
質問 # 31
Refer to the exhibit by clicking on the EXHIBIT button above.
In the detail shown, what is the required screw spacing in inches for the CLT to glulam connection?
正解：B
解説：
The connection detail specifies the CLT-to-glulam screws at 24 inches on center , so option D is correct. This is a construction-document interpretation question rather than a universal prescriptive screw-spacing requirement imposed by the IBC.
The approved structural detail controls the required spacing for this particular connection because the registered design professional has established the connection geometry and fastener schedule based on the applicable structural loads, CLT panel configuration, glulam member, fastener properties, and required load transfer. The 24-inch dimension must therefore be maintained in the field unless an approved revision changes the connection design.
IBC Table 1705.5.3 is directly relevant to the special inspector's responsibilities. For screws used in Type IV- A, IV-B, or IV-C mass timber connections, periodic special inspection includes verification of diameter, length, head type, spacing, installation angle, and installation depth . The special inspector is therefore expected to compare actual field installation against precisely this type of approved connection detail.
Substituting 12-, 16-, or 20-inch spacing without design authorization would constitute a deviation from the approved documents, even if the alternate spacing appeared more conservative.
References/Topics: Approved structural connection detail shown in the exhibit; 2021 IBC Section 1705.5.3 and Table 1705.5.3, inspection of screw spacing and installation.
質問 # 32
Fire-resistance ratings of members and assemblies can be established by all of the following except:
正解：D
解説：
ASTM E84 is not a test for establishing the fire-resistance rating of a structural member or building assembly.
Therefore, option B is the exception.
The 2021 IBC establishes fire-resistance ratings primarily through testing conducted in accordance with ASTM E119 or UL 263. Those tests evaluate whether an element or assembly can maintain structural performance, limit flame passage, and control temperature rise for a specified duration under standardized fire exposure. ASTM E84 instead evaluates surface-burning characteristics, principally flame-spread and smoke- developed indices. An E84 classification cannot establish that a wall, floor, beam, column, or connection possesses a one-, two-, or three-hour fire-resistance rating.
The IBC also recognizes approved prescriptive designs under Section 721, calculated fire resistance under Section 722, and designs documented in approved sources or supported by permitted analytical methods.
Those are valid methods represented by options A, C, and D.
For inspection purposes, the approved construction documents must identify the method used to establish the rating. The inspector must then verify that the installed materials, dimensions, loading assumptions, protective layers, fasteners, joints, and connection details match the tested, calculated, or prescriptive design.
References/Topics: 2021 IBC Sections 703.2, 703.2.1, 721 and 722; ASTM E119 and UL 263 fire-resistance testing.
質問 # 33
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 # 34
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