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| Section | Objectives |
|---|---|
| Fire-Resistance & Protection | - Concealed Spaces Protection - Fire-Resistance-Rated Assemblies - Noncombustible Protection & Encapsulation |
| Mass Timber Materials | - CLT, Glulam, NLT, SCL and Engineered Wood Products |
| Construction Fire Safety | |
| Inspection Duties & Documentation | - Statement of Special Inspections - Inspection Reporting and Compliance Verification |
| General & Construction Types | - Construction Classification โ Type IV-A, IV-B, IV-C
|
| Structural & Connection Inspection | - Framing and Structural Elements - Connection Design and Protection |
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NEW QUESTION # 25
For Type IV-A, IV-B, and IV-C construction, each of the following materials on the exterior side of mass timber exterior walls is required to be noncombustible except:
Answer: B
Explanation:
The code provides a specific combustible-material exception for qualifying water-resistive barriers , making option D correct. The exterior-protection provisions for Types IV-A, IV-B, and IV-C require the exterior side of mass timber walls to receive noncombustible protection with at least a 40-minute assigned protection time, and components of the exterior wall covering are generally required to be noncombustible.
A water-resistive barrier may be combustible only where it satisfies stringent fire-performance criteria.
Among those criteria, the 2021 IBC limits peak heat-release rate and total heat release under ASTM E1354 and establishes flame-spread and smoke-developed limits under ASTM E84 or UL 723. The provision therefore does not create a blanket exemption for arbitrary combustible membranes.
Insulation, exterior cladding, and architectural components forming part of the regulated exterior wall covering must comply with the applicable noncombustibility requirements unless some other express code allowance applies. The WRB is the specifically identified exception tested by this question.
During inspection, product identification and fire-test documentation should be checked rather than assuming that a membrane qualifies merely because it is marketed as a water-resistive barrier.
References/Topics: 2021 IBC Sections 602.4.1.1, 602.4.2.1 and 602.4.3.1; exterior wall protection and qualifying water-resistive barriers.
NEW QUESTION # 26
Materials acceptable for use in fire-protecting connections in Type IV-A construction includes each of the following except:
Answer: A
Explanation:
Steel plates are not themselves a fire-protective material for the connection; therefore, option A is the exception. Steel plates frequently form part of mass timber structural connections, but because steel is highly thermally conductive, exposed steel can rapidly transmit heat into fasteners and adjacent wood. Consequently, the steel connection components are normally the items that require protection , not the material relied upon to provide that protection.
AWC guidance recognizes wood cover, fire-rated gypsum board, and other approved protection materials as valid means of shielding structural connections. TR10 specifically provides calculation procedures and worked examples using sacrificial wood cover and Type X gypsum wallboard. An approved protective coating can also be used where its documented fire-performance characteristics establish the required endurance under the approved design.
The distinction is important for inspection. A concealed steel plate does not automatically mean a protected connection. The special inspector must verify whether sufficient wood cover, gypsum protection, approved coating, or another engineered protection system surrounds the steel for the required duration. Hardware geometry, exposed edges, gaps, and penetrations can all materially affect thermal performance.
References/Topics: AWC Technical Report No. 10, protection of structural connections; 2021 IBC Section
2304.10.1; AWC guidance that connection protection can be provided by wood cover, gypsum board, or other approved material.
NEW QUESTION # 27
In mass timber construction of Type IV-B, each of the following is suitable for use as fireblocking except:
Answer: D
Explanation:
A 7/16-inch wood structural panel does not satisfy the prescribed minimum thickness for fireblocking.
Therefore, option C is the exception.
IBC Section 718.2.1 permits one thickness of 23/32-inch wood structural panel where the joints are properly backed. A 7/16-inch panel is substantially thinner and cannot be substituted without an approved alternative- material determination. The code also recognizes one-half-inch gypsum board and properly installed batts or blankets of mineral wool or other approved materials.
Mass timber complying with Section 2304.11 is also permitted as fireblocking. Its large cross section provides resistance to the movement of flame, hot gases, and smoke through a concealed space that is at least equivalent to the nominal lumber traditionally accepted for this purpose.
The inspector must distinguish fireblocking from a tested firestop system. Fireblocking divides or interrupts concealed combustible cavities; it does not automatically protect a penetration through a fire-resistance-rated wall or floor. Installation must completely fill or close the required space, remain securely supported, and comply with requirements for joints, edges, penetrations, and mineral-fiber compression.
References/Topics: 2021 IBC Section 718.2.1; Section 2304.11; approved fireblocking materials in mass timber construction.
NEW QUESTION # 28
Combustible construction forming concealed spaces shall be protected with noncombustible protection with an assigned time of 40 minutes in which construction type?
Answer: B
Explanation:
The requirement applies to Type IV-C construction. Under the 2021 IBC provisions governing Type IV-C, combustible construction forming concealed spaces must be protected with noncombustible protection having an assigned protection time of not less than 40 minutes. Therefore, option C is correct.
The assigned protection time is determined using the protection-time values prescribed by the code, including the applicable values for gypsum board and other approved noncombustible materials. The provision is intended to delay ignition and involvement of combustible mass timber surfaces located within concealed spaces, where fire growth might otherwise remain undetected and become difficult for fire-suppression personnel to access.
Type IV-A and Type IV-B are subject to more extensive noncombustible protection requirements because those construction types support taller buildings and require greater protection of mass timber elements. Type IV-HT uses the traditional heavy-timber concealed-space provisions and may employ alternative methods, such as complete filling with noncombustible insulation.
During inspection, the special inspector must confirm that the installed layers, thicknesses, fastening patterns, joints, penetrations, and transitions collectively provide the required 40-minute assigned protection time.
References/Topics: 2021 IBC Section 602.4.3.5; Table 722.7.1(1); Type IV-C concealed-space protection.
NEW QUESTION # 29
What fire-resistance rating is required for Type IV-C exterior and interior bearing walls?
Answer: B
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 # 30
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