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| Section | Objectives |
|---|---|
| Topic 1: Fire Protection and Fire-Resistance | - Fire-resistance requirements - Noncombustible protection and protection of mass timber elements - Fire protection systems and related provisions |
| Topic 2: Construction Fire Safety | - Construction-phase fire safety requirements - Protection of mass timber during construction - International Fire Code requirements |
| Topic 3: Special Inspection Requirements | - Special inspection procedures for tall mass timber buildings - Inspector duties and responsibilities - Inspection of connections and protective materials |
| Topic 4: Structural Inspection | - Connections and fastening systems - Structural loads and related code requirements - Mass timber structural elements |
| Topic 5: Tall Mass Timber Building Code Provisions | - International Building Code requirements for tall mass timber construction - Mass timber materials and construction requirements - Types IV-A, IV-B and IV-C construction |
| Topic 6: Code Compliance and Related Requirements | - Documentation and verification of compliance - Sound transmission requirements - Energy code requirements applicable to mass timber buildings |
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NEW QUESTION # 53
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 # 54
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 # 55
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 # 56
In mass timber construction of Type IV-B, each of the following is suitable for use as fireblocking except:
Answer: A
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 # 57
All of the following combustible elements may be used in mass timber buildings except:
Answer: D
NEW QUESTION # 58
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