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| Section | Objectives |
|---|---|
| Topic 1: General & Construction Types | - Construction Classification — Type IV-A, IV-B, IV-C
|
| Topic 2: Structural & Connection Inspection | - Connection Design and Protection - Framing and Structural Elements |
| Topic 3: Mass Timber Materials | - CLT, Glulam, NLT, SCL and Engineered Wood Products |
| Topic 4: Fire-Resistance & Protection | - Concealed Spaces Protection - Fire-Resistance-Rated Assemblies - Noncombustible Protection & Encapsulation |
| Topic 5: Inspection Duties & Documentation | - Inspection Reporting and Compliance Verification - Statement of Special Inspections |
| Topic 6: Construction Fire Safety |
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52. Frage
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?
Antwort: D
Begründung:
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.
53. Frage
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?
Antwort: A
Begründung:
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.
54. Frage
All of the following combustible elements may be used in mass timber buildings except:
Antwort: B
55. Frage
Given: A special inspector notices on a mass timber building set of drawings a 8 in. x 8 in. solid sawn nominal dimension lumber element.
The design team has recommended the solid sawn member be replaced with an SCL element.
What minimum SCL size would be correct per the International Building Code?
Antwort: D
Begründung:
The IBC does not require structural composite lumber to retain the same nominal dimensions as the solid- sawn member it replaces. Instead, the minimum finished dimensions are determined from the heavy-timber dimensional equivalency provisions in Section 2304.11.
For a solid-sawn member having nominal dimensions of 8 inches by 8 inches, the corresponding minimum structural composite lumber net dimensions are 7 inches in width by 7-1/2 inches in depth. Therefore, option B is correct. The dimensional conversion recognizes that nominal solid-sawn dimensions differ from actual manufactured dimensions and that SCL products are produced to controlled net dimensions.
The 6-3/4-inch by 8-1/4-inch dimensions in option C correspond to the minimum glued-laminated timber equivalency for an 8-inch-by-8-inch nominal solid-sawn member, not the SCL equivalency. Option D incorrectly assumes that the SCL member must retain the original nominal dimensions, while option A does not match the required equivalency for either SCL or glued-laminated timber.
The substitution must also be approved by the registered design professional because dimensional compliance alone does not establish equivalent structural capacity, connection behavior, fire resistance, or load-path performance.
References/Topics: 2021 IBC Section 2304.11; heavy-timber minimum dimensions; minimum structural composite lumber net-size table.
56. Frage
Which of the following is true regarding fire-resistance rating protection provided by noncombustible covering material?
Antwort: C
Begründung:
IBC Table 722.7.1(2) assigns a 40-minute protection contribution to 5/8-inch Type X gypsum board .
Therefore, option D is correct.
The same table assigns 25 minutes to 1/2-inch Type X gypsum board. Consequently, option B overstates the protection contribution of the thinner Type X panel. Ordinary gypsum board values appearing elsewhere in Section 722 cannot simply be substituted for the specific mass timber noncombustible protection values in Table 722.7.1(2). Options A and C therefore do not state the protection contribution recognized by the mass timber table.
These assigned values are particularly important when multiple layers are required. For example, a two-hour building element requires at least 80 minutes of noncombustible protection under Table 722.7.1(1), which can be satisfied prescriptively with two properly installed layers of 5/8-inch Type X gypsum board, each contributing 40 minutes.
The contribution is valid only when the gypsum board is installed and fastened in accordance with Section
722.7.2.
References/Topics: 2021 IBC Tables 722.7.1(1) and 722.7.1(2); Section 722.7.2; Type X gypsum noncombustible protection.
57. Frage
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