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

SectionObjectives
Tall Mass Timber Building Code Provisions- Mass Timber Products and Definitions
- Type IV Construction
  • 1. Construction Types IV-A, IV-B and IV-C
    • 2. Heights, Stories and Allowable Areas
      - Fire Safety and Fire Resistance
      • 1. Fire-resistance ratings and noncombustible protection
        • 2. Fire protection systems and construction fire safety
          - Special Inspection Requirements
          • 1. Special inspection of mass timber construction
            • 2. Inspection of connections and protective measures
              - Structural and Connection Requirements
              • 1. Mass timber structural systems
                • 2. Connections and connection protection
                  - Applicable Codes and References
                  • 1. International Fire Code
                    • 2. International Building Code
                      • 3. Mass Timber Buildings and the IBC

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                        International Code Council 93-Tall-Mass-Timber-Buildings Sample Questions (Q40-Q45):

                        NEW QUESTION # 40
                        Disregarding footnotes, which of the following is true regarding fire-resistance ratings of building elements per the International Building Code Table 601?

                        Answer: C

                        Explanation:
                        When the footnotes are disregarded, the fire-resistance ratings assigned to the principal building elements of Type IV-A construction correspond to those of Type I-A construction . Option A is therefore correct.
                        IBC Table 601 assigns both Type I-A and Type IV-A a 3-hour rating for the primary structural frame , 3 hours for exterior and interior bearing walls, 2 hours for floor construction and associated secondary structural members , and 1½ hours for roof construction and associated secondary structural members
                        . Interior nonbearing walls and partitions are generally rated zero by Table 601 unless another code provision requires a rating. Exterior nonbearing walls are governed separately based on fire separation distance.
                        The similarity in Table 601 ratings does not mean Type I-A and Type IV-A are otherwise equivalent construction types. Type I-A relies principally on noncombustible structural construction, whereas Type IV-A permits mass timber subject to the substantial noncombustible protection requirements of Section 602.4.1.
                        Types II-A, III-A, IV-C, and IV-HT have materially different Table 601 requirements, so options B, C, and D do not provide a complete rating match.
                        References/Topics: 2021 IBC Section 601 and Table 601; Types I-A and IV-A fire-resistance ratings.


                        NEW QUESTION # 41
                        Fire-resistance ratings of members and assemblies can be established by all of the following except:

                        Answer: A

                        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 # 42
                        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: C

                        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 # 43
                        Where Type X gypsum board serves as noncombustible protection for interior surfaces of wall and ceiling assemblies, all of the following code provisions are correct except:

                        Answer: B

                        Explanation:
                        Option D is the incorrect statement. IBC Section 722.7.2.1 requires the panel edges of the face layer , rather than the base layer, to be taped and finished with joint compound. Fastener heads on the face layer must also be covered with joint compound.
                        The other three provisions accurately reproduce the code. Each gypsum-board layer must be secured with Type S drywall screws long enough to penetrate the mass timber at least 1 inch when driven flush. Screws for the base layer are installed at 12 inches on center in both directions . Subsequent layers use the same general spacing but are offset from screws in the preceding layer. In addition, the panel edges of each succeeding layer must be offset 18 inches from the panel edges of the previous layer.
                        These details are not merely workmanship recommendations. They form part of the installation conditions under which the protection contributions in Table 722.7.1(2) can be credited.
                        References/Topics: 2021 IBC Section 722.7.2.1, Items 1-9; fastening, panel-edge offset, and finishing of Type X gypsum protection.


                        NEW QUESTION # 44
                        Each of the following is true for special inspection of mass timber construction except:

                        Answer: A

                        Explanation:
                        Option A is the false statement. Under 2021 IBC Table 1705.5.3, bolted connections require periodic special inspection, not continuous special inspection.
                        The remaining three statements correspond directly to items contained in the table. Concealed connections are subject to periodic inspection. Erection of mass timber construction is also periodically inspected. For threaded fasteners, the inspector must periodically verify the use of pre-drilled holes where the approved design or manufacturer's installation requirements call for them.
                        The distinction between periodic and continuous inspection is fundamental. Periodic inspection means the special inspector observes the work at appropriate intervals sufficient to verify compliance. Continuous inspection requires the inspector to be present continuously during the performance of the regulated work.
                        Table 1705.5.3 reserves continuous inspection for the particularly installation-sensitive condition involving adhesive anchors installed horizontally or upwardly inclined to resist sustained tension loads.
                        For bolted connections, periodic inspection remains technically substantive. The inspector should verify bolt size and type, hole preparation, connection geometry, washers and nuts, required tightening, member condition, edge and end distances, and conformity with the approved structural drawings.
                        References/Topics: 2021 IBC Section 1705.5.3; Table 1705.5.3, Required Special Inspections of Mass Timber Construction.


                        NEW QUESTION # 45
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