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International Code Council 93-Tall-Mass-Timber-Buildings Exam Syllabus Topics:

Section Objectives
Fire-Resistance & Protection - Concealed Spaces Protection
- Noncombustible Protection & Encapsulation
- Fire-Resistance-Rated Assemblies
General & Construction Types - Construction Classification — Type IV-A, IV-B, IV-C
  • 1. Height and Area Limitations
    • 2. Allowable Uses and Limitations
      Mass Timber Materials - CLT, Glulam, NLT, SCL and Engineered Wood Products
      Inspection Duties & Documentation - Inspection Reporting and Compliance Verification
      - Statement of Special Inspections
      Construction Fire Safety
      Structural & Connection Inspection - Connection Design and Protection
      - Framing and Structural Elements

      >> 93-Tall-Mass-Timber-Buildings教育資料 <<

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      International Code Council 93-Tall-Mass-Timber-Buildings 認定 93-Tall-Mass-Timber-Buildings 試験問題 (Q64-Q69):

      質問 # 64
      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?

      • A. Two layers of 5/8-inch Type X gypsum board or equivalent
      • B. No requirement as long as the wall is 2-hour rated
      • C. One half inch gypsum board or a noncombustible equivalent
      • D. Materials providing at least 1 hour of fire resistance

      正解：C

      解説：
      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.


      質問 # 65
      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.

      • A. 0
      • B. 1
      • C. 2
      • D. 3

      正解：A

      解説：
      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.


      質問 # 66
      Refer to the figure by clicking on the EXHIBIT button above.


      In Type IV-B construction, unprotected portions of mass timber as shown in the Figure is limited to an area equal to not more than what percentage of the base floor area?

      • A. 30%
      • B. 40%
      • C. 20%
      • D. 15%

      正解：B

      解説：
      The highlighted exposed surfaces in this figure are mass timber wall surfaces . Under 2021 IBC Section
      602.4.2.2.2, Exception 1.2, unprotected portions of Type IV-B mass timber walls, including attached columns, are permitted up to an area equal to 40 percent of the floor area in the applicable dwelling unit or fire area.
      Option D is therefore correct.
      This should be distinguished from the corresponding ceiling limitation. Unprotected mass timber ceilings, including attached beams, are limited to 20 percent of floor area. The larger 40-percent allowance applies specifically to wall exposure.
      Where only wall surfaces are exposed, the allowable wall area is calculated directly from the base floor area.
      For example, a 1,000-square-foot fire area would permit up to 400 square feet of exposed wall surface under this exception. However, Section 602.4.2.2.4 additionally requires unprotected wall portions to maintain the prescribed 15-foot separation from other applicable exposed wall or ceiling portions.
      Where exposed walls and exposed ceilings occur together, the individual 40- and 20-percent limits cannot simply be maximized simultaneously; the mixed-exposure equation in Section 602.4.2.2.3 governs.
      References/Topics: 2021 IBC Sections 602.4.2.2.2 through 602.4.2.2.4; Type IV-B wall exposure.


      質問 # 67
      Concealed spaces in a Type IV-C building must be protected with:

      • A. noncombustible materials with at least 40 minutes of assigned protection time.
      • B. the same protection as used for interior spaces in a Type IV-C.
      • C. sprinklers per NFPA 13.
      • D. a lining of fire-retardant-treated wood.

      正解：A

      解説：
      In Type IV-C construction, combustible construction forming concealed spaces must receive noncombustible protection providing an assigned time of at least 40 minutes. Consequently, option D is correct.
      Type IV-C permits substantial portions of mass timber to remain exposed within occupied interior spaces, subject to the applicable construction and fire-resistance requirements. That permission does not extend unchanged into concealed spaces. Concealed combustible surfaces create a different hazard because fire can spread above ceilings, inside shafts, or within service cavities without immediate detection. Section 602.4.3.5 therefore imposes a specific 40-minute noncombustible protection requirement.
      An NFPA 13 sprinkler system is generally required for tall mass timber buildings, but sprinkler protection alone is not the prescribed substitute for this concealed-space protection. Fire-retardant-treated wood is still combustible and does not constitute the required noncombustible protective membrane. Option C is also incorrect because the concealed-space rule is more specific than the provisions governing exposed surfaces in occupied spaces.
      Inspection should occur before closure so that membrane continuity, board orientation, fastener spacing, joint treatment, penetrations, and protection around connection hardware can be fully observed.
      References/Topics: 2021 IBC Sections 602.4.3.2 and 602.4.3.5; Table 722.7.1(1); concealed combustible construction in Type IV-C buildings.


      質問 # 68
      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?

      • A. Type IV-A
      • B. Type IV-HT
      • C. Type IV-B
      • D. Type IV-C

      正解：A

      解説：
      The illustrated wall corresponds to Type IV-A construction , making option A correct. The key indicator is the extensive Type X gypsum protection provided on the interior face of the CLT wall. Figure 63 shows multiple layers of 5/8-inch Type X gypsum board protecting the interior mass timber, together with the required exterior-side protection.
      Type IV-A is the most comprehensively protected of the three tall mass timber construction classifications.
      IBC Section 602.4.1.2 requires the interior faces of all mass timber elements , including the inside face of exterior mass timber walls, to be protected with qualifying noncombustible material. Section 602.4.1.2.1 requires the protection contribution to satisfy Table 722.7.1(1) and never be less than 80 minutes. Type IV-A exterior walls also require at least 40 minutes of noncombustible protection on the outside face.
      The three interior layers shown are consistent with a heavily protected Type IV-A rated wall. By contrast, Type IV-B permits limited exposed interior mass timber, while Type IV-C expressly permits mass timber interior elements to remain unprotected. Type IV-HT operates under fundamentally different heavy-timber provisions.
      References/Topics: 2021 IBC Sections 602.4.1.1, 602.4.1.2 and 602.4.1.2.1; Tables 601 and 722.7.1(1)-(2).


      質問 # 69
      ......

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