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| Section | Objectives |
|---|---|
| Topic 1: Structural Inspection | - Structural loads and related code requirements - Connections and fastening systems - Mass timber structural elements |
| 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: Construction Fire Safety | - Protection of mass timber during construction - International Fire Code requirements - Construction-phase fire safety requirements |
| Topic 4: Fire Protection and Fire-Resistance | - Noncombustible protection and protection of mass timber elements - Fire-resistance requirements - Fire protection systems and related provisions |
| Topic 5: Tall Mass Timber Building Code Provisions | - Types IV-A, IV-B and IV-C construction - Mass timber materials and construction requirements - International Building Code requirements for tall mass timber construction |
| Topic 6: Code Compliance and Related Requirements | - Documentation and verification of compliance - Energy code requirements applicable to mass timber buildings - Sound transmission requirements |
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質問 # 37
Concealed spaces in a Type IV-C building must be protected with:
正解：C
解説：
In Type IV-C construction, combustible construction forming concealed spaces must receive noncombustible protection providing an assigned time of at least 40 minutes. Consequently, option D is correct.
Type IV-C permits substantial portions of mass timber to remain exposed within occupied interior spaces, subject to the applicable construction and fire-resistance requirements. That permission does not extend unchanged into concealed spaces. Concealed combustible surfaces create a different hazard because fire can spread above ceilings, inside shafts, or within service cavities without immediate detection. Section 602.4.3.5 therefore imposes a specific 40-minute noncombustible protection requirement.
An NFPA 13 sprinkler system is generally required for tall mass timber buildings, but sprinkler protection alone is not the prescribed substitute for this concealed-space protection. Fire-retardant-treated wood is still combustible and does not constitute the required noncombustible protective membrane. Option C is also incorrect because the concealed-space rule is more specific than the provisions governing exposed surfaces in occupied spaces.
Inspection should occur before closure so that membrane continuity, board orientation, fastener spacing, joint treatment, penetrations, and protection around connection hardware can be fully observed.
References/Topics: 2021 IBC Sections 602.4.3.2 and 602.4.3.5; Table 722.7.1(1); concealed combustible construction in Type IV-C buildings.
質問 # 38
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 # 39
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 # 40
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.
正解：D
解説：
The permitted reduction is one hour. Table 601 assigns a two-hour base fire-resistance rating to exterior and interior bearing walls in Type IV-C construction. Footnote "a" to the table permits the ratings of the primary structural frame and bearing walls to be reduced by one hour where those elements support a roof only.
Accordingly, a Type IV-C bearing wall that supports only roof construction may be assigned a one-hour rating after application of the permitted reduction. The allowance recognizes that the element is not carrying occupied floor levels above and therefore presents a lower consequence of progressive structural failure than a wall supporting one or more floors.
The reduction is not automatic merely because a bearing wall is located at the upper story. The approved structural documents must establish that the wall supports only the roof and does not carry floor loads, transfer loads, elevated mechanical platforms, occupied rooftop structures, or other construction that invalidates the condition.
Options A and B are not reductions specified by Table 601. Option D would eliminate the entire two-hour rating and is not permitted. The inspector should verify the applicable rating and the precise load path before accepting reduced fire protection at the top story.
References/Topics: 2021 IBC Table 601, Footnote "a"; Type IV-C bearing walls and roof-support rating reduction.
質問 # 41
Given: Sealants or adhesives need not be provided where they are not a required component of a tested fire resistance rated assembly.
If a sealant is required, it must meet the requirement of ASTM:
正解：A
解説：
A sealant required to resist air passage between qualifying mass timber elements must comply with ASTM C920. Therefore, option C is correct. ASTM C920 is the recognized specification for elastomeric joint sealants and establishes requirements for properties such as movement capability, adhesion, cohesion, hardness, weathering, and durability.
IBC Section 703.7 differentiates between the two materials: sealants must meet ASTM C920, while adhesives must meet ASTM D3498. Option D therefore applies to an adhesive rather than a sealant. ASTM E119 is the standard fire test used to establish the fire-resistance rating of structural members and assemblies; it does not serve as the product specification for the sealant. ASTM E114 is not the applicable standard under this provision.
The stated exception is important. Section 703.7 does not require an additional sealant or adhesive where it is not a required component of the tested fire-resistance-rated assembly. Where the approved assembly or code provision does require it, however, the specified product, location, joint preparation, backing material, depth, width, and tooling must match the approved construction documents.
References/Topics: 2021 IBC Section 703.7; ASTM C920 sealants; ASTM D3498 adhesives; tested fire- resistance-rated assemblies.
質問 # 42
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