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| Section | Objectives |
|---|---|
| Special Inspection Requirements | - Special inspection procedures for tall mass timber buildings - Inspection of connections and protective materials - Inspector duties and responsibilities |
| Structural Inspection | - Connections and fastening systems - Mass timber structural elements - Structural loads and related code requirements |
| Code Compliance and Related Requirements | - Documentation and verification of compliance - Sound transmission requirements - Energy code requirements applicable to mass timber buildings |
| 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 |
| Fire Protection and Fire-Resistance | - Fire protection systems and related provisions - Noncombustible protection and protection of mass timber elements - Fire-resistance requirements |
| Construction Fire Safety | - Construction-phase fire safety requirements - International Fire Code requirements - Protection of mass timber during construction |
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NEW QUESTION # 31
Which of the following provisions for mass timber used for interior exit and elevator hoistway enclosures is true?
Answer: A
Explanation:
Option A correctly applies the protection requirements for mass timber used in qualifying interior exit and elevator hoistway enclosures. Where a two-hour, or 120-minute, fire-resistance rating is required, the noncombustible protection must contribute not less than two-thirds of that required rating. Two-thirds of 120 minutes is 80 minutes.
The 2021 IBC provisions for Type IV-A require interior mass timber surfaces to be protected with compliant noncombustible materials. The assigned protection time is determined under Section 722.7 and cannot be less than the applicable minimum. Option B is incorrect because 40 minutes would provide only one-third of a two-hour rating; Type IV-B protected mass timber generally requires at least 80 minutes for a two-hour element. Option C does not correctly describe the special protection path applicable to mass timber exit and hoistway enclosures. Option D is also incorrect because Type IV-HT is not governed by the tall mass timber enclosure provision stated in the question.
The inspector must verify the total assigned protection time, membrane type, number of layers, fastening, joints, corners, penetrations, and continuity on both required faces of the enclosure.
References/Topics: 2021 IBC Sections 602.4, 602.4.1.2 and 722.7.1; protection of mass timber shaft and exit enclosures.
NEW QUESTION # 32
Refer to the exhibit by clicking on the EXHIBIT button above.
In the detail shown, what is the required tolerance in inches between the steel beam web and CLT?
Answer: A
Explanation:
The construction detail identifies a 1/2-inch tolerance between the steel beam web and the adjacent CLT panel. Therefore, option B is correct.
This is principally a construction-document interpretation question rather than a generic prescriptive IBC dimension. The 2021 IBC does not establish one universal steel-web-to-CLT clearance applicable to every mass timber connection. The required clearance is project specific and is established by the registered design professional through the approved structural drawings and connection details.
The tolerance provides erection clearance for placement of the prefabricated CLT around the steel member while accounting for fabrication and installation variation. It must not be arbitrarily reduced or increased because the gap can affect panel fit, bearing conditions, fastener alignment, fire-protection continuity, acoustic treatment and any specified joint-filling material.
Under the special-inspection framework, the inspector must compare the installed connection directly with the approved construction documents. Any condition that does not maintain the specified 1/2-inch clearance-or any undocumented field modification to the CLT or steel connection-must be reported and resolved through the registered design professional rather than accepted solely on the contractor's direction.
References/Topics: Approved structural details; 2021 IBC Sections 1704.2 and 1705.5; inspection of mass timber erection, anchorage and connections.
NEW QUESTION # 33
Regarding water supply for the protection of buildings under construction, when combustible building materials of the building under construction are delivered to a site, the minimum fire flow provided shall be
_____ gpm.
Answer: A
Explanation:
The minimum required fire flow is 500 gallons per minute. Therefore, option C is correct.
Under 2021 IFC Section 3313.2, an approved water supply must be available when combustible building materials for the building under construction are delivered to the project site. The hydrant supplying the required flow must be located within the prescribed distance of the combustible materials as measured along an approved fire apparatus access route. Where one hydrant cannot provide coverage to all combustible material locations, additional hydrants are required.
The 500-gpm requirement is the initial minimum associated with the delivery of combustible building materials. It should not be confused with the potentially greater fire-flow requirements applicable after vertical construction of a Type III, IV, or V building begins. Depending on fire separation distance and the building's calculated final fire-flow demand, a larger supply may be required under subsequent provisions.
Options A and B provide inadequate suppression capacity. Option D is not the baseline amount prescribed for the condition stated in the question. Inspectors and site safety personnel should verify that the water source is operational and accessible before substantial quantities of mass timber arrive on-site.
References/Topics: 2021 IFC Sections 3313.1 and 3313.2; construction-site water supply and combustible building materials.
NEW QUESTION # 34
According to UL Fire Resistance Directory, a "finish rating" is the time:
Answer: B
Explanation:
Option C correctly states the fundamental UL finish-rating criterion. UL defines a finish rating for assemblies containing combustible wood structural supports as the elapsed fire-exposure time at which the wood member immediately behind the protective membrane reaches the prescribed temperature-rise threshold.
More precisely, UL uses two criteria: an average temperature rise of 250°F or an individual-point temperature rise of 325°F , measured on the plane of the wood nearest the fire, typically between the gypsum membrane and the wood stud or joist. The question asks for the principal definition, which is the 250° F temperature-rise criterion; therefore, option C is correct. Option D incorrectly treats the 325°F individual- point limit as the sole definition.
Options A and B confuse a finish rating with "assigned protection time." IBC Tables 722.6 and 722.7 provide calculated contribution values for specified protective materials, but those assigned values are not themselves UL finish ratings.
This distinction matters in mass timber fire design because membrane contribution, thermal separation, structural fire resistance, and finish rating are related but not interchangeable concepts.
References/Topics: UL Fire Resistance Directory terminology; finish rating; average 250°F and individual
325°F temperature-rise criteria.
NEW QUESTION # 35
Fire-resistance ratings of members and assemblies can be established by all of the following except:
Answer: B
Explanation:
ASTM E84 cannot be used to establish the hourly fire-resistance rating of a structural member or assembly.
Therefore, option B is correct.
ASTM E84 evaluates surface-burning characteristics , principally flame-spread and smoke-developed indices. Those measurements characterize how a material ' s exposed surface behaves when subjected to the standard tunnel test. They do not demonstrate that a wall, floor, roof, beam, column, or structural assembly will maintain integrity and structural performance for one, two, or three hours.
Fire-resistance ratings are instead established through the methods recognized by the IBC, including standard fire testing-principally ASTM E119 or UL 263-prescriptive rated construction provided by Section 721, and calculated fire-resistance procedures under Section 722. The code also recognizes appropriately documented approved designs and other approved methods within the Section 703 framework.
This distinction is particularly important in mass timber work because ASTM E84 may appear elsewhere in the code for flame-spread limitations on materials, but an acceptable E84 result does not establish structural fire endurance.
The special inspector must determine which approved fire-resistance methodology applies and verify that the installed assembly precisely reflects that design.
References/Topics: 2021 IBC Sections 703, 721 and 722; ASTM E119; UL 263; distinction between fire resistance and ASTM E84 surface-burning testing.
NEW QUESTION # 36
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