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| Section | Objectives |
|---|---|
| Topic 1: Construction Fire Safety | |
| Topic 2: General & Construction Types | - Construction Classification โ Type IV-A, IV-B, IV-C
|
| Topic 3: Inspection Duties & Documentation | - Inspection Reporting and Compliance Verification - Statement of Special Inspections |
| Topic 4: Structural & Connection Inspection | - Connection Design and Protection - Framing and Structural Elements |
| Topic 5: Mass Timber Materials | - CLT, Glulam, NLT, SCL and Engineered Wood Products |
| Topic 6: Fire-Resistance & Protection | - Noncombustible Protection & Encapsulation - Concealed Spaces Protection - Fire-Resistance-Rated Assemblies |
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NEW QUESTION # 49
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 are required to be separated by _____ feet.
Answer: C
Explanation:
The required separation is 15 feet , making option B correct. Section 602.4.2.2.4 of the 2021 IBC specifically regulates the separation distance between unprotected mass timber elements in Type IV-B construction.
Within each dwelling unit or fire area, unprotected portions of mass timber walls and ceilings must be separated from other unprotected wall and ceiling portions by not less than 15 feet . For ceiling-related surfaces, the separation is measured horizontally along the ceiling. For wall-to-wall exposure, the applicable separation is measured horizontally along the floor.
This requirement operates in addition to the maximum exposed-area restrictions. A designer therefore cannot merely demonstrate that the exposed ceiling is below 20 percent or that exposed walls are below 40 percent of floor area; the exposed regions must also satisfy the required spatial separation.
The purpose is to prevent multiple exposed mass timber regions from acting as closely spaced fuel packages during a compartment fire. During inspection, dimensions should be checked against the approved documents before required gypsum or other noncombustible protection is completed.
References/Topics: 2021 IBC Section 602.4.2.2.4; separation distance between unprotected Type IV-B mass timber elements.
NEW QUESTION # 50
Given: A building of Type IV-B construction is designed to be greater than six stories above grade plane.
At least one layer of required noncombustible protection shall be installed on all of the following building elements except _____ on all floor levels more than four levels below active mass timber construction before erecting additional floor levels during construction.
Answer: D
Explanation:
The intended code exception is shafts and vertical exit enclosures , making option B correct. The governing construction-phase provision is 2021 IFC Section 3303.5, which applies to buildings of Types IV-A, IV-B, and IV-C designed to exceed six stories above grade plane.
Where Section 602.4 of the IBC requires noncombustible protection, at least one layer must be installed on building elements located on floor levels-including mezzanines-more than four levels below active mass timber construction before additional floor levels can be erected. The provision is intended to prevent a tall mass timber project from accumulating an excessive number of substantially unprotected combustible stories during erection.
Section 3303.5 expressly states that shafts and vertical exit enclosures are not considered part of the active mass timber construction for application of this construction-progress requirement. Therefore, B is the examination answer.
Mezzanines are expressly included in the protected-level requirement. Required protection for floors, walls, and ceilings under IBC Section 602.4 progresses with construction subject to the IFC provision. The same section also requires standpipes, an approved water supply for fire department operations, and timely installation of required exterior wall coverings.
References/Topics: 2021 IFC Section 3303.5; 2021 IBC Section 602.4; fire safety during construction of tall mass timber buildings.
NEW QUESTION # 51
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?
Answer: C
Explanation:
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.
NEW QUESTION # 52
What fire-resistance rating is required for Type IV-C exterior and interior bearing walls?
Answer: D
Explanation:
IBC Table 601 requires both exterior and interior bearing walls in Type IV-C construction to have a minimum two-hour fire-resistance rating. Option B is correct.
For exterior bearing walls, the Table 601 rating is not the only applicable criterion. Section 602.1 also requires exterior walls to satisfy Table 705.5 based on occupancy and fire separation distance. Where Table 705.5 or another provision imposes a more restrictive rating, the higher requirement governs.
The two-hour rating may be achieved through the calculated structural fire resistance of the mass timber, approved noncombustible protection, or an approved combination of the two. Connections, intersections, penetrations, and abutting edges must not create a premature failure path or compromise the rated assembly.
A one-hour reduction can be permitted for bearing walls supporting a roof only under Table 601, Footnote
"a," but that exception does not apply to a wall carrying floors or other qualifying structural loads. The inspector must confirm the actual load path before accepting any reduced protection at the uppermost level.
References/Topics: 2021 IBC Sections 601, 602.1 and 602.4; Tables 601 and 705.5; Type IV-C bearing walls.
NEW QUESTION # 53
Which of the following is an acceptable alternative for protecting structural connections from fire in Type IV- A, IV-B or IV-C construction?
Answer: C
Explanation:
Option D directly reflects the engineering-analysis method authorized by 2021 IBC Section 2304.10.1. For structural connections in Type IV-A, IV-B, or IV-C construction, the analysis must demonstrate that temperatures at every relevant portion of the connection remain within prescribed limits for a period corresponding to the fire-resistance rating required of the connected structural element.
The code establishes two critical temperature-rise limits: an average rise of not more than 250ยฐF and a maximum rise of not more than 325ยฐF . For this purpose, the "connection" includes the connectors, fasteners, and those portions of the wood members that participate structurally in the connection.
Option A is incorrect because ASTM E136 is a test for determining whether a material is noncombustible; it is not the fire-resistance test method for a structural connection. Option B is not a code-recognized substitute for the required connection fire evaluation. Option C is insufficient because a manufacturer's generalized fire- performance representation does not establish the required code fire-resistance duration unless supported through an approved test, evaluation, or engineering analysis.
References/Topics: 2021 IBC Section 2304.10.1; engineering-analysis method for Type IV-A, IV-B, and IV- C structural connections.
NEW QUESTION # 54
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