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| Section | Objectives |
|---|---|
| Construction Fire Safety | |
| General & Construction Types | - Construction Classification — Type IV-A, IV-B, IV-C
|
| Inspection Duties & Documentation | - Inspection Reporting and Compliance Verification - Statement of Special Inspections |
| Structural & Connection Inspection | - Connection Design and Protection - Framing and Structural Elements |
| Fire-Resistance & Protection | - Fire-Resistance-Rated Assemblies - Noncombustible Protection & Encapsulation - Concealed Spaces Protection |
| Mass Timber Materials | - CLT, Glulam, NLT, SCL and Engineered Wood Products |
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NEW QUESTION # 26
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 1½-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 # 27
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.
Answer: D
Explanation:
IBC Table 601, Footnote "a," permits a one-hour reduction in the required fire-resistance rating of the primary structural frame and bearing walls where those elements support a roof only. Option C is therefore correct.
For Type IV-C construction, the normal Table 601 requirement for bearing walls is two hours. Where a bearing wall qualifies as supporting only roof construction, application of the footnote permits that rating to be reduced from two hours to one hour.
The limitation "supporting a roof only" is critical. The reduction cannot be applied simply because a wall is located at the uppermost occupied level. If the wall carries a floor, mezzanine, transfer load, occupied rooftop structure, or another structural element beyond qualifying roof construction, the condition for the reduction is not satisfied.
Options A and B are not reductions prescribed by Table 601. Option D would effectively eliminate the entire normal two-hour Type IV-C bearing-wall rating, which the footnote does not permit.
For inspection purposes, the approved construction documents and structural load path must substantiate use of the reduction. The fire-protection installation should then be checked against the actual reduced rating specifically authorized by the design.
References/Topics: 2021 IBC Table 601, Footnote "a"; Type IV-C bearing walls supporting roof construction only.
NEW QUESTION # 28
Refer to the figure by clicking on the EXHIBIT button above.
The exterior wall section shown in the Figure provides the prescribed noncombustible protection required by which Construction Type?
Answer: B
Explanation:
The illustrated wall corresponds to Type IV-A construction , making option A correct. The key indicator is the extensive Type X gypsum protection provided on the interior face of the CLT wall. Figure 63 shows multiple layers of 5/8-inch Type X gypsum board protecting the interior mass timber, together with the required exterior-side protection.
Type IV-A is the most comprehensively protected of the three tall mass timber construction classifications.
IBC Section 602.4.1.2 requires the interior faces of all mass timber elements , including the inside face of exterior mass timber walls, to be protected with qualifying noncombustible material. Section 602.4.1.2.1 requires the protection contribution to satisfy Table 722.7.1(1) and never be less than 80 minutes. Type IV-A exterior walls also require at least 40 minutes of noncombustible protection on the outside face.
The three interior layers shown are consistent with a heavily protected Type IV-A rated wall. By contrast, Type IV-B permits limited exposed interior mass timber, while Type IV-C expressly permits mass timber interior elements to remain unprotected. Type IV-HT operates under fundamentally different heavy-timber provisions.
References/Topics: 2021 IBC Sections 602.4.1.1, 602.4.1.2 and 602.4.1.2.1; Tables 601 and 722.7.1(1)-(2).
NEW QUESTION # 29
All of the following combustible elements may be used in mass timber buildings except:
Answer: A
NEW QUESTION # 30
The building owner shall be responsible for each of the following for fire safety during construction except:
Answer: C
Explanation:
The IFC does not require daily inspection documentation to be stored in a fire- and water-resistant safe.
Therefore, option C is the exception.
The owner or the owner's authorized agent must establish and maintain the required construction-site fire- prevention program and designate a site safety director. The site safety director is responsible for completing a daily fire-safety inspection covering the building and exterior project areas. The results must be documented, retained on-site until the certificate of occupancy is issued, and made immediately available to the fire code official upon request. Options A, B, and D accurately reflect these administrative requirements.
The purpose is not merely record retention. Daily inspections are intended to identify conditions such as obstructed fire apparatus access, blocked hydrants or fire department connections, exposed temporary wiring, improper hazardous-material storage, uncontrolled combustible debris, unavailable extinguishers, impaired standpipes, and deficient hot-work controls.
A special inspector is not automatically the site safety director. However, observations involving installed passive protection or unsafe construction conditions should be communicated through the approved reporting process. The owner remains accountable for implementing the site safety plan and maintaining the required documentation.
References/Topics: 2021 IFC Sections 3303.1 through 3303.3; site safety director and daily fire-safety inspection records.
NEW QUESTION # 31
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