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| Section | Objectives |
|---|---|
| Topic 1: Tall Mass Timber Building Code Provisions | - Type IV Construction
- Fire Safety and Fire Resistance
|
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NEW QUESTION # 54
Disregarding footnotes, which of the following is true regarding fire-resistance ratings of building elements per the International Building Code Table 601?
Answer: A
Explanation:
When the footnotes are disregarded, the fire-resistance ratings assigned to the principal building elements of Type IV-A construction correspond to those of Type I-A construction . Option A is therefore correct.
IBC Table 601 assigns both Type I-A and Type IV-A a 3-hour rating for the primary structural frame , 3 hours for exterior and interior bearing walls, 2 hours for floor construction and associated secondary structural members , and 1ยฝ hours for roof construction and associated secondary structural members
. Interior nonbearing walls and partitions are generally rated zero by Table 601 unless another code provision requires a rating. Exterior nonbearing walls are governed separately based on fire separation distance.
The similarity in Table 601 ratings does not mean Type I-A and Type IV-A are otherwise equivalent construction types. Type I-A relies principally on noncombustible structural construction, whereas Type IV-A permits mass timber subject to the substantial noncombustible protection requirements of Section 602.4.1.
Types II-A, III-A, IV-C, and IV-HT have materially different Table 601 requirements, so options B, C, and D do not provide a complete rating match.
References/Topics: 2021 IBC Section 601 and Table 601; Types I-A and IV-A fire-resistance ratings.
NEW QUESTION # 55
In mass timber construction of Type IV-B, each of the following is suitable for use as fireblocking except:
Answer: B
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 # 56
Proprietary nails can be used by referencing which ICC-ES Evaluation Report?
Answer: A
Explanation:
ICC-ES ESR-1539 is the applicable evaluation report, making option C correct. ESR-1539 addresses nails and staples manufactured by participating companies and evaluates their use in engineered and nonengineered structural connections.
An ICC-ES Evaluation Report provides evidence that a proprietary product or system complies with specified building-code requirements where the product does not rely solely on the generic prescriptive provisions of the IBC. For proprietary nails, the report provides the technical basis needed to establish characteristics such as dimensions, materials, recognized structural applications, allowable design values, installation limitations, and conditions of use.
The current ICC-ES document is published as ESR-1539P, reflecting subsequent administrative updates to the report, but the identifying evaluation-report number remains 1539 , matching option C and the examination question.
For special inspection, merely recognizing the ESR number is not enough. The inspector should verify that the installed proprietary fastener is actually included in the report, that its diameter and length correspond to the approved construction documents, and that installation spacing, penetration, orientation, substrate, and other report conditions are satisfied.
References/Topics: ICC-ES ESR-1539, structural nails and staples; proprietary fastener evaluation and installation requirements. ICC-ES states that the nails and staples covered by ESR-1539 are used in engineered and prescriptive structural connections.
NEW QUESTION # 57
Materials acceptable for use in fire-protecting connections in Type IV-A construction includes each of the following except:
Answer: C
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 # 58
In mass timber construction of Type IV-B, each of the following is suitable for use as fireblocking except:
Answer: B
Explanation:
A 7/16-inch wood structural panel is not one of the prescriptively acceptable fireblocking materials listed by IBC Section 718.2.1. Therefore, option C is correct.
Section 718.2.1 permits fireblocking to consist of several specified materials. These include one-half-inch gypsum board; properly secured batts or blankets of mineral wool, mineral fiber, or other approved materials; and mass timber complying with Section 2304.11. Options A, B, and D are consequently valid.
For wood structural panels, however, the IBC requires a substantially greater thickness: a single thickness of approximately 0.719 inch , conventionally represented as 23/32 inch, with joints backed by material of the same required thickness. A 7/16-inch panel is only approximately 0.438 inch thick and therefore does not satisfy that prescriptive fireblocking provision.
Fireblocking is intended to interrupt concealed draft openings and restrict the movement of flame and hot gases through concealed combustible spaces. It should not be confused with a tested firestop system used at penetrations through fire-resistance-rated assemblies.
Special inspection should confirm that the installed material, thickness, joint backing, retention, and location conform to the approved construction documents and the applicable code provision.
References/Topics: 2021 IBC Sections 718.2 and 718.2.1; Section 2304.11; permitted fireblocking materials.
NEW QUESTION # 59
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