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| Section | Objectives |
|---|---|
| Fire Protection and Fire-Resistance | - Fire protection systems and related provisions - Fire-resistance requirements - Noncombustible protection and protection of mass timber elements |
| Construction Fire Safety | - Protection of mass timber during construction - International Fire Code requirements - Construction-phase fire safety requirements |
| Special Inspection Requirements | - Inspection of connections and protective materials - Special inspection procedures for tall mass timber buildings - Inspector duties and responsibilities |
| Code Compliance and Related Requirements | - Energy code requirements applicable to mass timber buildings - Sound transmission requirements - Documentation and verification of compliance |
| Structural Inspection | - Mass timber structural elements - Connections and fastening systems - Structural loads and related code requirements |
| Tall Mass Timber Building Code Provisions | - Mass timber materials and construction requirements - Types IV-A, IV-B and IV-C construction - International Building Code requirements for tall mass timber construction |
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NEW QUESTION # 73
Fire-resistance ratings of members and assemblies can be established by all of the following except:
Answer: B
Explanation:
ASTM E84 is not a test for establishing the fire-resistance rating of a structural member or building assembly.
Therefore, option B is the exception.
The 2021 IBC establishes fire-resistance ratings primarily through testing conducted in accordance with ASTM E119 or UL 263. Those tests evaluate whether an element or assembly can maintain structural performance, limit flame passage, and control temperature rise for a specified duration under standardized fire exposure. ASTM E84 instead evaluates surface-burning characteristics, principally flame-spread and smoke- developed indices. An E84 classification cannot establish that a wall, floor, beam, column, or connection possesses a one-, two-, or three-hour fire-resistance rating.
The IBC also recognizes approved prescriptive designs under Section 721, calculated fire resistance under Section 722, and designs documented in approved sources or supported by permitted analytical methods.
Those are valid methods represented by options A, C, and D.
For inspection purposes, the approved construction documents must identify the method used to establish the rating. The inspector must then verify that the installed materials, dimensions, loading assumptions, protective layers, fasteners, joints, and connection details match the tested, calculated, or prescriptive design.
References/Topics: 2021 IBC Sections 703.2, 703.2.1, 721 and 722; ASTM E119 and UL 263 fire-resistance testing.
NEW QUESTION # 74
Which of the following best describes the required protection for mass timber hoistway enclosure walls in Type IV-C construction?
Answer: B
Explanation:
Type IV-C generally permits interior mass timber surfaces to remain exposed, but shaft and elevator hoistway enclosures are a specific exception to that broad exposure allowance. Section 602.4.3.6 requires shafts, elevator hoistways, and interior exit stairway enclosures constructed with mass timber to receive noncombustible protection having a minimum assigned protection time of 40 minutes . Option A is therefore correct.
Critically, protection is required on both the inside and outside of the shaft enclosure . The 40-minute value is an assigned contribution from the noncombustible protection; the complete enclosure must still satisfy whatever overall fire-resistance rating is required by Sections 713, 713.4, Table 601, or other applicable provisions.
Option B incorrectly applies the general Type IV-C exposed-interior allowance to a specifically regulated shaft condition. Option C is incomplete because 1/2-inch Type X gypsum board provides only 25 minutes under Table 722.7.1(2), not the required 40 minutes. A 5/8-inch Type X board provides a recognized 40- minute contribution when installed in accordance with Section 722.7.2. Option D does not state the prescribed Type IV-C shaft requirement.
References/Topics: 2021 IBC Sections 602.4.3.2 and 602.4.3.6; Tables 722.7.1(1) and 722.7.1(2).
NEW QUESTION # 75
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: D
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 # 76
Each of the following is true for special inspection of mass timber construction except:
Answer: B
Explanation:
Option A is the false statement. Under 2021 IBC Table 1705.5.3, bolted connections require periodic special inspection, not continuous special inspection.
The remaining three statements correspond directly to items contained in the table. Concealed connections are subject to periodic inspection. Erection of mass timber construction is also periodically inspected. For threaded fasteners, the inspector must periodically verify the use of pre-drilled holes where the approved design or manufacturer's installation requirements call for them.
The distinction between periodic and continuous inspection is fundamental. Periodic inspection means the special inspector observes the work at appropriate intervals sufficient to verify compliance. Continuous inspection requires the inspector to be present continuously during the performance of the regulated work.
Table 1705.5.3 reserves continuous inspection for the particularly installation-sensitive condition involving adhesive anchors installed horizontally or upwardly inclined to resist sustained tension loads.
For bolted connections, periodic inspection remains technically substantive. The inspector should verify bolt size and type, hole preparation, connection geometry, washers and nuts, required tightening, member condition, edge and end distances, and conformity with the approved structural drawings.
References/Topics: 2021 IBC Section 1705.5.3; Table 1705.5.3, Required Special Inspections of Mass Timber Construction.
NEW QUESTION # 77
Combustible construction forming concealed spaces shall be protected with noncombustible protection with an assigned time of 40 minutes in which construction type?
Answer: A
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 # 78
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