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| Section | Objectives |
|---|---|
| Topic 1: Tall Mass Timber Building Code Provisions | - Type IV Construction
- Fire Safety and Fire Resistance
|
>> Reliable International Code Council 93-Tall-Mass-Timber-Buildings Test Practice <<
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NEW QUESTION # 70
Both surfaces of a two-hour-rated mass timber wall that serves as a required separation between a Group R and Group I-2 occupancy in a Type IV-C building must be protected by at least which of the following?
Answer: A
Explanation:
The minimum additional protection is 1/2-inch gypsum board or an approved equivalent thermal barrier
, making option C correct.
The wall in the question functions as an occupancy separation. Under IBC Section 508.4.4.1, mass timber elements serving as fire barriers or horizontal assemblies separating occupancies in Type IV-B or IV-C construction must be separated from the building interior by an approved thermal barrier consisting of gypsum board at least 1/2 inch thick , or a material satisfying both applicable NFPA 275 thermal-barrier tests.
Because the wall separates two interior occupancies, each face is exposed to interior space; consequently, the thermal-barrier requirement applies to both surfaces .
This requirement must not be confused with the wall ' s two-hour fire-resistance rating. The underlying mass timber wall must independently satisfy the required two-hour assembly performance. The 1/2-inch gypsum protection is an additional thermal-barrier condition imposed because the rated separation is constructed of mass timber in Type IV-C.
Option D would provide substantially more gypsum protection than the specific occupancy-separation provision requires.
References/Topics: 2021 IBC Sections 508.4.4 and 508.4.4.1; Type IV-B/IV-C mass timber occupancy separations; approved thermal barriers; NFPA 275.
NEW QUESTION # 71
One code-recognized method for calculating the fire-resistance rating of exposed wood members and decking is:
Answer: C
Explanation:
The intended answer is ANSI/AWC NDS Chapter 16. The video option uses "AWS," but the correct standards organization is the American Wood Council-AWC . Option D is therefore correct based on its intended reference.
IBC Section 722.1 expressly permits exposed wood members and wood decking to have their calculated fire resistance determined in accordance with Chapter 16 of the ANSI/AWC National Design Specification for Wood Construction. The method evaluates charring, the effective char depth, the reduced residual cross section, elevated-temperature effects, loading, and the remaining structural capacity for the required exposure period.
ACI 216.1 applies to concrete and masonry fire resistance. TMS 0216 addresses masonry assemblies. ASCE
29 Chapter 5 provides procedures for calculating the fire resistance of structural steel assemblies. Those references are code-recognized methods, but they apply to different construction materials.
For mass timber inspection, the approved calculations should identify the exposed surfaces, required rating, timber species or product, member dimensions, design loads, protective contribution, and connection treatment. Field reductions in member dimensions can invalidate the calculated fire resistance.
References/Topics: 2021 IBC Section 722.1; ANSI/AWC NDS Chapter 16; calculated fire resistance of exposed wood members and decking.
NEW QUESTION # 72
Adhesives used to resist passage of air in construction Type IV-C, shall be in accordance with which of the following standards?
Answer: A
Explanation:
Adhesives installed to resist air passage at qualifying mass timber interfaces must comply with ASTM D3498.
Therefore, option C is correct. IBC Section 703.7 applies this requirement to Types IV-A, IV-B, and IV-C at prescribed abutting edges and intersections of building elements that require fire-resistance ratings.
ASTM D3498 addresses adhesives used for field-gluing wood-based structural components. Compliance is significant because the adhesive must retain adequate bond performance under the environmental and service conditions associated with the approved application. The special inspector should verify product identification, compatibility with the timber substrate, manufacturer instructions, storage conditions, shelf life, surface preparation, application temperature, coverage, and curing.
UL 263 is a fire-resistance test standard for building assemblies and structural elements; it is not the product standard for the adhesive. ASTM A653 applies to metallic-coated steel sheet. ASTM F1575 concerns pressure-sensitive safety glazing films and is unrelated to sealing mass timber interfaces.
Where the adhesive is required by Section 703.7, its installation is subject to periodic special inspection under Section 1705.20 unless the applicable code exception removes the sealing requirement.
References/Topics: 2021 IBC Sections 703.7 and 1705.20; ASTM D3498; Type IV-C sealing requirements.
NEW QUESTION # 73
In mass timber construction of Type IV-C, the fire-resistance ratings of bearing walls are permitted to be reduced by _____ where supporting a roof only.
Answer: B
Explanation:
The permitted reduction is one hour. Table 601 assigns a two-hour base fire-resistance rating to exterior and interior bearing walls in Type IV-C construction. Footnote "a" to the table permits the ratings of the primary structural frame and bearing walls to be reduced by one hour where those elements support a roof only.
Accordingly, a Type IV-C bearing wall that supports only roof construction may be assigned a one-hour rating after application of the permitted reduction. The allowance recognizes that the element is not carrying occupied floor levels above and therefore presents a lower consequence of progressive structural failure than a wall supporting one or more floors.
The reduction is not automatic merely because a bearing wall is located at the upper story. The approved structural documents must establish that the wall supports only the roof and does not carry floor loads, transfer loads, elevated mechanical platforms, occupied rooftop structures, or other construction that invalidates the condition.
Options A and B are not reductions specified by Table 601. Option D would eliminate the entire two-hour rating and is not permitted. The inspector should verify the applicable rating and the precise load path before accepting reduced fire protection at the top story.
References/Topics: 2021 IBC Table 601, Footnote "a"; Type IV-C bearing walls and roof-support rating reduction.
NEW QUESTION # 74
Refer to the figure by clicking on the EXHIBIT button above.
The exterior wall section shown in the Figure provides the prescribed noncombustible protection required by which Construction Type?
Answer: C
Explanation:
The illustrated configuration represents Type IV-C construction , so option C is correct. The distinguishing feature is the combination of noncombustible protection on the exterior face with an exposed CLT surface toward the interior.
IBC Section 602.4.3.1 requires the exterior side of combustible exterior walls in Type IV-C construction to have noncombustible protection providing a minimum assigned time of 40 minutes . Table 722.7.1(2) assigns exactly 40 minutes to one layer of 5/8-inch Type X gypsum board, matching the protection illustrated in Figure 66.
The decisive distinction is Section 602.4.3.2: mass timber elements in Type IV-C are permitted to be unprotected on the interior . This is fundamentally different from Type IV-A, where essentially all interior mass timber faces must be protected, and Type IV-B, where interior protection is generally required but limited areas may remain exposed under specific area and separation restrictions.
Type IV-HT does not use the Type IV-C protected-exterior/exposed-interior regulatory scheme.
References/Topics: 2021 IBC Sections 602.4.3, 602.4.3.1 and 602.4.3.2; Table 722.7.1(2), 5/8-inch Type X gypsum board = 40 minutes.
NEW QUESTION # 75
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