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| Section | Objectives |
|---|---|
| Fire Protection and Fire-Resistance | - Noncombustible protection and protection of mass timber elements - Fire protection systems and related provisions - Fire-resistance requirements |
| Construction Fire Safety | - Construction-phase fire safety requirements - Protection of mass timber during construction - International Fire Code requirements |
| Code Compliance and Related Requirements | - Sound transmission requirements - Documentation and verification of compliance - Energy code requirements applicable to mass timber buildings |
| 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 |
| Special Inspection Requirements | - Inspection of connections and protective materials - Special inspection procedures for tall mass timber buildings - Inspector duties and responsibilities |
| Structural Inspection | - Connections and fastening systems - Structural loads and related code requirements - Mass timber structural elements |
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NEW QUESTION # 62
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 # 63
Sealants used to resist passage of air in construction Type IV-A, shall be in accordance with which of the following standards?
Answer: A
NEW QUESTION # 64
Refer to the exhibit by clicking on the EXHIBIT button above.
In the detail shown and according to AWC Technical Report 10, what is the time assigned in minutes to 5/8 in. Type X gypsum board for connection fire protection thermal separation requirements?
Answer: B
Explanation:
For the illustrated two-layer protection system, the 5/8-inch Type X gypsum-board layer directly adjacent to the connection is assigned 20 minutes, while the second layer is assigned 40 minutes. Therefore, option C is correct.
The standard assigned protection time for one layer of 5/8-inch Type X gypsum board is 40 minutes.
However, the thermal-separation methodology applies a 0.50 reduction factor to the final or base Type X layer located directly against the protected connection. That layer therefore contributes 20 minutes. The outer layer retains its full 40-minute assigned value, producing a combined assigned protection time of 60 minutes for the two-layer configuration.
The layers are not interchangeable for calculation purposes because the reduced contribution applies specifically to the layer adjacent to the protected connection. Options A and B incorrectly assign the same value to both layers, while option D reverses the required allocation.
During inspection, the special inspector should verify layer sequencing, board thickness and type, fastening, joint staggering, edge support, protection at corners, and continuity around the connection. Missing or incorrectly sequenced layers can invalidate the calculated thermal-separation time.
References/Topics: AWC Technical Report 10; AWC 2021 Fire Design Specification Section 3.5.2.1; assigned protection time for Type X gypsum board.
NEW QUESTION # 65
Each of the following is true regarding the fire-resistance rating for exterior bearing walls except:
Answer: D
Explanation:
Option A is the exception because the base fire-resistance rating for an exterior bearing wall in Type IV-C construction is two hours, not one hour. The values are established by 2021 IBC Table 601.
Type IV-A has the most stringent tall mass timber construction requirements and assigns a three-hour rating to exterior bearing walls. Type IV-B and Type IV-C each assign a two-hour rating. Consequently, options B, C, and D accurately state the Table 601 requirements, while option A understates the required rating by one hour.
The Table 601 value is the minimum construction-type rating. Exterior bearing walls must also comply with the exterior-wall requirements of Table 705.5 based on fire separation distance. Where another code provision requires a higher rating, the more restrictive requirement governs. The inspector must therefore avoid treating the two-hour Type IV-C value as an absolute maximum.
Field verification should include the approved wall assembly, mass timber dimensions, noncombustible exterior protection, membrane continuity, protection of connections, intersections, joints, and any required opening protection. An exterior bearing wall installed as a nominal one-hour assembly would not comply merely because the timber itself has substantial cross-sectional dimensions.
References/Topics: 2021 IBC Table 601; Sections 602.4 and 705.5; exterior bearing-wall ratings for Types IV- A, IV-B, and IV-C.
NEW QUESTION # 66
Based on the definition of cross-laminated timber (CLT), panels are manufactured as follows:
Answer: D
Explanation:
The 2021 IBC definition of cross-laminated timber describes a prefabricated engineered wood product consisting of not less than three layers of solid-sawn lumber or structural composite lumber. The adjacent layers are cross oriented and bonded with structural adhesive to form a solid wood element. Accordingly, option C is correct.
Cross orientation means that the principal grain direction of one layer is arranged approximately perpendicular to that of the adjoining layer. This configuration distinguishes CLT from products in which all laminations run parallel, such as conventional glued-laminated timber. The cross-oriented layup provides two- way panel behavior, dimensional stability, and structural capacity in both principal directions.
Option A is incorrect because CLT must contain at least three layers. Option B describes a mechanically laminated product rather than structural glued CLT; nail-laminated timber uses mechanical fasteners, whereas code-compliant CLT uses structural adhesives and must conform to the applicable manufacturing standard.
Option D eliminates the defining cross-lamination characteristic and would instead describe a parallel- laminated product.
During inspection, the product label and certification documentation should be checked to confirm the panel was manufactured under the required quality-assurance program.
References/Topics: 2021 IBC Chapter 2 definition of "Cross-Laminated Timber"; Sections 602.4 and
2303.1.4; ANSI/APA PRG 320.
NEW QUESTION # 67
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