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| Section | Objectives |
|---|---|
| Topic 1: Construction Fire Safety | |
| Topic 2: General & Construction Types | - Construction Classification โ Type IV-A, IV-B, IV-C
|
| Topic 3: Structural & Connection Inspection | - Framing and Structural Elements - Connection Design and Protection |
| Topic 4: Inspection Duties & Documentation | - Statement of Special Inspections - Inspection Reporting and Compliance Verification |
| Topic 5: Fire-Resistance & Protection | - Noncombustible Protection & Encapsulation - Concealed Spaces Protection - Fire-Resistance-Rated Assemblies |
| Topic 6: Mass Timber Materials | - CLT, Glulam, NLT, SCL and Engineered Wood Products |
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NEW QUESTION # 50
What fire-resistance rating is required for Type IV-C exterior and interior bearing walls?
Answer: C
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 # 51
All of the following combustible elements may be used in mass timber buildings except:
Answer: B
Explanation:
A conventional 2 ร 6 solid-sawn stud is a light-frame member and does not satisfy the minimum cross- sectional dimensions associated with mass timber or heavy-timber construction. Therefore, option A is the exception.
The IBC defines mass timber as Type IV structural elements primarily composed of solid, built-up, panelized or engineered wood products that meet the minimum cross-sectional dimensions required for Type IV construction. A nominal 2 ร 6 stud is substantially smaller than those dimensions and is ordinarily classified as conventional light-frame construction. Its use might be permitted in a particular nonstructural partition or another specifically authorized application, but it is not itself a qualifying mass timber structural element.
CLT is expressly recognized as a mass timber panel product. Parallel-strand lumber is a form of structural composite lumber and can qualify where it satisfies the applicable minimum dimensions, product-standard requirements and approved structural design. Dowel-laminated timber is a built-up panelized timber product and may likewise serve as a mass timber element when its dimensions, engineering and approval satisfy the construction documents and code.
The classification depends on the completed element's dimensions and approved structural function-not merely on the fact that it is manufactured from wood.
References/Topics: 2021 IBC Chapter 2 definitions of "Mass Timber" and "Conventional Light-Frame Construction"; Sections 602.4 and 2304.11.
NEW QUESTION # 52
Buildings of Types IV-A, IV-B, and IV-C construction designed to be greater than six stories above grade plane shall meet which of the following requirements for fire safety practices during construction?
Answer: D
Explanation:
Option A is an exact requirement of the 2021 International Fire Code Section 3303.5 . For Type IV-A, IV- B, and IV-C buildings designed to exceed six stories above grade plane, standpipes must be provided in accordance with IFC Section 3313, unless otherwise approved by the fire code official.
The IFC also requires a water supply for fire department operations, but that supply must be approved by the fire code official and fire chief; the code does not specifically mandate that it be a "portable" water supply.
Option B is therefore incorrect.
The remaining options alter important numerical requirements. Where noncombustible protection is required and construction exceeds six stories, at least one layer , not two, must be installed on applicable building elements more than four levels below active mass timber construction before additional floor levels are erected. Required exterior wall coverings are likewise required more than four levels below active mass timber construction, rather than two.
These safeguards reduce the amount of exposed combustible construction while ensuring that effective fire department infrastructure progresses with the building.
References/Topics: 2021 IFC Section 3303.5; Sections 3313 and related construction-stage fire protection requirements.
NEW QUESTION # 53
Given: A building of Type IV-B construction is designed to be greater than six stories above grade plane.
At least one layer of required noncombustible protection shall be installed on all of the following building elements except _____ on all floor levels more than four levels below active mass timber construction before erecting additional floor levels during construction.
Answer: C
Explanation:
The intended code exception is shafts and vertical exit enclosures , making option B correct. The governing construction-phase provision is 2021 IFC Section 3303.5, which applies to buildings of Types IV-A, IV-B, and IV-C designed to exceed six stories above grade plane.
Where Section 602.4 of the IBC requires noncombustible protection, at least one layer must be installed on building elements located on floor levels-including mezzanines-more than four levels below active mass timber construction before additional floor levels can be erected. The provision is intended to prevent a tall mass timber project from accumulating an excessive number of substantially unprotected combustible stories during erection.
Section 3303.5 expressly states that shafts and vertical exit enclosures are not considered part of the active mass timber construction for application of this construction-progress requirement. Therefore, B is the examination answer.
Mezzanines are expressly included in the protected-level requirement. Required protection for floors, walls, and ceilings under IBC Section 602.4 progresses with construction subject to the IFC provision. The same section also requires standpipes, an approved water supply for fire department operations, and timely installation of required exterior wall coverings.
References/Topics: 2021 IFC Section 3303.5; 2021 IBC Section 602.4; fire safety during construction of tall mass timber buildings.
NEW QUESTION # 54
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 # 55
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