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| Section | Objectives |
|---|---|
| Mass Timber Materials | - CLT, Glulam, NLT, SCL and Engineered Wood Products |
| Structural & Connection Inspection | - Framing and Structural Elements - Connection Design and Protection |
| Construction Fire Safety | |
| Fire-Resistance & Protection | - Fire-Resistance-Rated Assemblies - Noncombustible Protection & Encapsulation - Concealed Spaces Protection |
| General & Construction Types | - Construction Classification โ Type IV-A, IV-B, IV-C
|
| Inspection Duties & Documentation | - Statement of Special Inspections - Inspection Reporting and Compliance Verification |
>> Exam 93-Tall-Mass-Timber-Buildings Overview <<
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NEW QUESTION # 75
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:
Answer: C
Explanation:
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.
NEW QUESTION # 76
In Type IV-C construction, a connection between two members of the primary structural frame supporting a floor is required to be protected to achieve a minimum fire-resistance rating of:
Answer: B
Explanation:
The required minimum fire-resistance rating is two hours , making option C correct. Table 601 assigns a two- hour fire-resistance rating to the primary structural frame in Type IV-C construction. The structural connection between members of that rated frame cannot become a premature failure point in the load path.
IBC Section 2304.10.1 specifically addresses structural connections in Types IV-A, IV-B, and IV-C mass timber construction. Connection protection must provide the fire-resistance performance required for the connected building element. This can be accomplished through protected connection configurations, approved fire testing, or engineering analysis satisfying the applicable code criteria.
The connection includes more than the visible steel plate or bolt. Fasteners, connectors, concealed steel, bearing zones, and portions of the timber participating structurally in the connection must collectively maintain the required performance. A one-hour or 1ยฝ-hour connection would undermine a structural frame required to remain functional for two hours. Three hours is the primary-frame rating associated with Type IV- A, not the Type IV-C condition specified here.
The inspector should verify protection thickness, wood cover, gypsum layers, hardware embedment, edge conditions, and approved connection geometry before concealment.
References/Topics: 2021 IBC Table 601; Section 2304.10.1; fire-resistant structural connections in Types IV- A, IV-B, and IV-C.
NEW QUESTION # 77
Based on the definition of cross-laminated timber (CLT), panels are manufactured as follows:
Answer: B
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 # 78
Refer to the exhibit by clicking on the EXHIBIT button above.
Given: The connections between the glulam beam and CLT panels all require a fire-resistance rating of 2 hours, and wood cover is designed per AWC Technical Report 10 to provide the entire 2 hours of protection.
The bearing area between the CLT and glulam is the minimum required.
What are the minimum dimensions, in inches, for the wood block shown in red?
Answer: C
Explanation:
Under the illustrated connection detail, the minimum wood-block dimensions are 3 inches by 3 inches.
Therefore, option C is correct.
The block is part of the sacrificial wood-cover system used to protect the connection for the full two-hour fire- resistance period. It must provide sufficient timber beyond the protected connection region to account for calculated charring and the increased exposure that can develop at the interface between abutting wood members. Because the problem states that the CLT-to-glulam bearing area is already the minimum required, the primary members do not provide surplus material that can be credited as additional protection at that edge.
AWC connection-fire-design guidance requires the protective geometry to remain effective after the calculated char front advances. Char contraction can open a gap at abutting edges and expose material deeper in the connection than would occur on an uninterrupted planar surface. The 3-inch-by-3-inch block maintains the required protective envelope for the stated two-hour condition.
This dimension is specific to the illustrated configuration and assumptions; it is not a universal minimum for every mass timber connection. The inspector must verify the approved detail rather than substitute nominal blocking based solely on field availability.
References/Topics: AWC Technical Report 10; AWC Fire Design Specification provisions for wood-cover protection and char contraction at abutting members.
NEW QUESTION # 79
Regarding water supply for the protection of buildings under construction, when combustible building materials of the building under construction are delivered to a site, the minimum fire flow provided shall be
_____ gpm.
Answer: D
Explanation:
The minimum required fire flow is 500 gallons per minute. Therefore, option C is correct.
Under 2021 IFC Section 3313.2, an approved water supply must be available when combustible building materials for the building under construction are delivered to the project site. The hydrant supplying the required flow must be located within the prescribed distance of the combustible materials as measured along an approved fire apparatus access route. Where one hydrant cannot provide coverage to all combustible material locations, additional hydrants are required.
The 500-gpm requirement is the initial minimum associated with the delivery of combustible building materials. It should not be confused with the potentially greater fire-flow requirements applicable after vertical construction of a Type III, IV, or V building begins. Depending on fire separation distance and the building's calculated final fire-flow demand, a larger supply may be required under subsequent provisions.
Options A and B provide inadequate suppression capacity. Option D is not the baseline amount prescribed for the condition stated in the question. Inspectors and site safety personnel should verify that the water source is operational and accessible before substantial quantities of mass timber arrive on-site.
References/Topics: 2021 IFC Sections 3313.1 and 3313.2; construction-site water supply and combustible building materials.
NEW QUESTION # 80
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