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| Section | Objectives |
|---|---|
| Special Inspection Requirements | - Inspection of connections and protective materials - Inspector duties and responsibilities - Special inspection procedures for tall mass timber buildings |
| Code Compliance and Related Requirements | - Documentation and verification of compliance - Energy code requirements applicable to mass timber buildings - Sound transmission requirements |
| Construction Fire Safety | - International Fire Code requirements - Protection of mass timber during construction - Construction-phase fire safety requirements |
| Tall Mass Timber Building Code Provisions | - Types IV-A, IV-B and IV-C construction - International Building Code requirements for tall mass timber construction - Mass timber materials and construction requirements |
| Fire Protection and Fire-Resistance | - Fire protection systems and related provisions - Fire-resistance requirements - Noncombustible protection and protection of mass timber elements |
| Structural Inspection | - Structural loads and related code requirements - Mass timber structural elements - Connections and fastening systems |
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NEW QUESTION # 55
Refer to the exhibit by clicking on the EXHIBIT button above.
In the detail shown, if the connections between the glulam beam and CLT panels all require a fire-resistance rating of one (1) hour and the wood cover is designed per AWC Technical Report 10 to provide the entire 1 hour of protection, what is the minimum thickness and number of layers required for the locations shown in red?
Answer: B
Explanation:
Two layers of 5/8-inch Type X gypsum wallboard are required for the condition shown, so option D is correct. The relevant AWC TR10 connection-protection methodology distinguishes between outer gypsum layers and the base layer immediately adjacent to the connection .
For 5/8-inch Type X gypsum board, an outer layer contributes 40 minutes. However, when gypsum board is being relied upon as the complete thermal-separation protection for a connection, TR10 reduces the contribution of the final/base layer to 50 percent. Therefore, the base layer contributes 20 minutes , while the second, exterior layer contributes 40 minutes . The total is:
20 minutes + 40 minutes = 60 minutes .
That satisfies the one-hour required protection period.
This is why simply looking at the normal 40-minute contribution of one 5/8-inch Type X layer would be incorrect for this connection condition. TR10 expressly uses the reduced base-layer contribution when gypsum constitutes the connection protection. The same methodology shows that four 5/8-inch Type X layers are needed for 120 minutes: 20 + 40 + 40 + 40 = 140 minutes, satisfying two hours.
References/Topics: AWC Technical Report No. 10, Sections 4.4.2 and connection-protection examples. TR10 states that outer 5/8-inch Type X layers provide 40 minutes each while the base layer provides 20 minutes.
NEW QUESTION # 56
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 # 57
Refer to the exhibit by clicking on the EXHIBIT button above.
In the detail shown, the 2x2 block is intended for what purpose according to AWC Technical Report 10?
Answer: C
Explanation:
The 2 × 2 block is intended to protect the abutting wood edges from the effects of char contraction. Therefore, option D is correct.
During fire exposure, wood chars and the char layer can shrink or contract. At an interface between two abutting timber components, that contraction can create a gap that allows heat and flames to penetrate deeper than predicted for a continuous exposed surface. AWC connection-fire-design methodology therefore requires additional protection at susceptible joints and interfaces. The block shields the abutting edges and maintains the sacrificial wood-cover path around the protected connection.
Its primary function is not decorative, nor is it simply an air-sealing component. Although limiting airflow can be a secondary consequence of closing the interface, the design purpose addressed by the technical guidance is control of premature fire penetration caused by char contraction. The block also should not be interpreted independently as a generic one-hour protective membrane for the steel ledger; the connection's total rating depends on the complete approved protection assembly.
The inspector should confirm the block's dimensions, species or product designation, fastening, continuity, and tight installation before the connection is concealed.
References/Topics: AWC Technical Report 10; AWC Fire Design Specification provisions addressing char contraction and gaps between abutting wood members.
NEW QUESTION # 58
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 # 59
The building owner shall be responsible for each of the following for fire safety during construction except:
Answer: D
Explanation:
Option C is not an IFC requirement. The 2021 IFC requires inspection records to be maintained on-site, but it does not require those records to be secured in a fire- and water-resistant safe.
Section 3303.2 requires the owner to designate a site safety director. Section 3303.3 then makes that director responsible for completing a daily fire safety inspection of the project site. Every day, building and outdoor construction areas must be evaluated against the prescribed fire-safety inspection items.
The results of each inspection must be documented and retained on-site until a certificate of occupancy has been issued . The records must also be immediately available at the site for presentation to the fire code official upon request. Options A, B, and D therefore accurately reflect the code requirements.
The daily inspection program covers practical hazards such as hot work, temporary heating, combustible debris, temporary electrical wiring, hazardous-material storage, fire apparatus access, hydrants, fire department connections, standpipe availability, and portable extinguishers.
For tall mass timber projects, this documentation is particularly important because substantial combustible construction may be present before permanent fire protection systems are complete.
References/Topics: 2021 IFC Sections 3303.2 and 3303.3; site safety director; daily fire-safety inspection and documentation.
NEW QUESTION # 60
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