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| Section | Objectives |
|---|---|
| Topic 1: Tall Mass Timber Building Code Provisions | - International Building Code requirements for tall mass timber construction - Types IV-A, IV-B and IV-C construction - Mass timber materials and construction requirements |
| Topic 2: Special Inspection Requirements | - Special inspection procedures for tall mass timber buildings - Inspector duties and responsibilities - Inspection of connections and protective materials |
| Topic 3: Code Compliance and Related Requirements | - Documentation and verification of compliance - Sound transmission requirements - Energy code requirements applicable to mass timber buildings |
| Topic 4: Construction Fire Safety | - International Fire Code requirements - Construction-phase fire safety requirements - Protection of mass timber during construction |
| Topic 5: Structural Inspection | - Connections and fastening systems - Mass timber structural elements - Structural loads and related code requirements |
| Topic 6: Fire Protection and Fire-Resistance | - Fire-resistance requirements - Fire protection systems and related provisions - Noncombustible protection and protection of mass timber elements |
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質問 # 52
A proprietary field-glued mass timber beam splice will require which of the following:
正解：A
解説：
A proprietary field-glued mass timber beam splice requires special inspection because the connection relies on a field-applied adhesive process that is not covered as a routine prescriptive mass timber connection in Table
1705.5.3. The controlling mechanism is IBC Section 1705.1.1, which authorizes the building official to require special inspection for unusual materials, systems, or installation procedures, particularly where compliance depends on additional manufacturer installation instructions.
The ICC code-development rationale for the tall mass timber provisions specifically identifies field-glued mass timber beam or panel splices as an example of work for which special inspection can be required.
Inspection must address the approved evaluation report and manufacturer's instructions, including substrate preparation, moisture and temperature limits, adhesive storage and expiration, mixing or proportioning, application quantity, open time, member alignment, clamping or pressure, and curing conditions.
Approval by the permit applicant has no regulatory significance. Verification by the registered design professional may supplement the inspection program but does not replace the approved special inspector. A building official may observe the work, but routine field verification by that official is not the prescribed quality-control procedure.
References/Topics: 2021 IBC Sections 1704.2, 1704.3 and 1705.1.1; special cases; proprietary field-glued mass timber splices.
質問 # 53
Refer to the exhibit by clicking on the EXHIBIT button above.
In the detail shown and according to AWC Technical Report 10, what is the time assigned in minutes to 5/8 in. Type X gypsum board for connection fire protection thermal separation requirements?
正解：A
解説：
For the illustrated two-layer protection system, the 5/8-inch Type X gypsum-board layer directly adjacent to the connection is assigned 20 minutes, while the second layer is assigned 40 minutes. Therefore, option C is correct.
The standard assigned protection time for one layer of 5/8-inch Type X gypsum board is 40 minutes.
However, the thermal-separation methodology applies a 0.50 reduction factor to the final or base Type X layer located directly against the protected connection. That layer therefore contributes 20 minutes. The outer layer retains its full 40-minute assigned value, producing a combined assigned protection time of 60 minutes for the two-layer configuration.
The layers are not interchangeable for calculation purposes because the reduced contribution applies specifically to the layer adjacent to the protected connection. Options A and B incorrectly assign the same value to both layers, while option D reverses the required allocation.
During inspection, the special inspector should verify layer sequencing, board thickness and type, fastening, joint staggering, edge support, protection at corners, and continuity around the connection. Missing or incorrectly sequenced layers can invalidate the calculated thermal-separation time.
References/Topics: AWC Technical Report 10; AWC 2021 Fire Design Specification Section 3.5.2.1; assigned protection time for Type X gypsum board.
質問 # 54
Adhesives used to resist passage of air in construction Type IV-C, shall be in accordance with which of the following standards?
正解：D
解説：
Adhesives installed to resist air passage at qualifying mass timber interfaces must comply with ASTM D3498.
Therefore, option C is correct. IBC Section 703.7 applies this requirement to Types IV-A, IV-B, and IV-C at prescribed abutting edges and intersections of building elements that require fire-resistance ratings.
ASTM D3498 addresses adhesives used for field-gluing wood-based structural components. Compliance is significant because the adhesive must retain adequate bond performance under the environmental and service conditions associated with the approved application. The special inspector should verify product identification, compatibility with the timber substrate, manufacturer instructions, storage conditions, shelf life, surface preparation, application temperature, coverage, and curing.
UL 263 is a fire-resistance test standard for building assemblies and structural elements; it is not the product standard for the adhesive. ASTM A653 applies to metallic-coated steel sheet. ASTM F1575 concerns pressure-sensitive safety glazing films and is unrelated to sealing mass timber interfaces.
Where the adhesive is required by Section 703.7, its installation is subject to periodic special inspection under Section 1705.20 unless the applicable code exception removes the sealing requirement.
References/Topics: 2021 IBC Sections 703.7 and 1705.20; ASTM D3498; Type IV-C sealing requirements.
質問 # 55
Refer to the figure by clicking on the EXHIBIT button above.
In Type IV-B construction, based on a 900 sq. ft. floor area, a 30 ' room width, and a 12 in. x 18 in. beam as shown in the Figure, the maximum length of the unprotected portion of the mass timber ceiling (dimension X) is _____ feet.
正解：D
解説：
Section 602.4.2.2.2 permits unprotected mass timber ceilings in Type IV-B construction to equal no more than 20 percent of the floor area , and the code expressly states that attached beams are included when determining that exposed ceiling area.
The floor area is 900 square feet:
20% × 900 = 180 sq. ft. maximum exposed area .
The exposed 12-inch × 18-inch beam extends across the 30-foot room. Its three exposed surfaces consist of the 12-inch-wide bottom and two 18-inch-deep sides:
30 ft × (1 ft + 1.5 ft + 1.5 ft) = 120 sq. ft.
Because the attached beam counts against the ceiling exposure allowance, only:
180 # 120 = 60 sq. ft.
remains available for the exposed ceiling itself.
The exposed ceiling extends across the 30-foot room width, so:
30 ft × X = 60 sq. ft.
Therefore:
X = 2 ft .
Option A is correct. Ignoring the beam surfaces would overstate the permitted ceiling exposure and would contradict the explicit IBC requirement that attached beams be included in the exposed ceiling calculation.
References/Topics: 2021 IBC Section 602.4.2.2.2, Exception 1.1; Type IV-B exposed ceiling and attached- beam area calculations.
質問 # 56
Which of the following construction Types permit concealed spaces to be protected by completely filling the concealed space with noncombustible insulation?
正解：A
解説：
Type IV-HT construction permits concealed spaces where those spaces comply with the specific protection alternatives prescribed for traditional heavy-timber construction. One permitted method is to completely fill the concealed space with noncombustible insulation. Therefore, option D is correct.
This provision should not be confused with the concealed-space requirements applicable to the tall mass timber classifications-Types IV-A, IV-B, and IV-C. Those classifications employ dedicated noncombustible protection and assigned-time requirements intended to control the contribution of concealed combustible construction during a fire. Type IV-HT follows a different concealed-space framework and allows protection through approved alternatives, including sprinkler protection, gypsum-board enclosure, or complete filling with noncombustible insulation, as applicable.
The insulation must completely occupy the concealed volume. Merely installing partial batt insulation, leaving unprotected voids, or relying on nominally fire-resistant thermal insulation does not satisfy the provision. The inspector should verify the material's noncombustibility, continuity, placement around obstructions, and conformance with the approved construction documents before the space becomes inaccessible.
References/Topics: 2021 IBC Section 602.4.4; concealed spaces in Type IV-HT construction; noncombustible insulation protection method.
質問 # 57
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