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| Section | Objectives |
|---|---|
| Topic 1: Structural Inspection | - Connections and fastening systems - Structural loads and related code requirements - Mass timber structural elements |
| Topic 2: Code Compliance and Related Requirements | - Documentation and verification of compliance - Energy code requirements applicable to mass timber buildings - Sound transmission requirements |
| Topic 3: Tall Mass Timber Building Code Provisions | - International Building Code requirements for tall mass timber construction - Types IV-A, IV-B and IV-C construction - Mass timber materials and construction requirements |
| Topic 4: Construction Fire Safety | - International Fire Code requirements - Construction-phase fire safety requirements - Protection of mass timber during construction |
| Topic 5: Special Inspection Requirements | - Special inspection procedures for tall mass timber buildings - Inspection of connections and protective materials - Inspector duties and responsibilities |
| Topic 6: Fire Protection and Fire-Resistance | - Fire protection systems and related provisions - Noncombustible protection and protection of mass timber elements - Fire-resistance requirements |
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NEW QUESTION # 43
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 # 44
When Type X gypsum board is used as noncombustible protection over mass timber on the building ' s exterior walls, which of the following fasteners are permitted?
Answer: D
Explanation:
Option A reproduces one of the two permitted exterior gypsum-board fastening methods in 2021 IBC Section
722.7.2.2. Type X gypsum board used as noncombustible protection on the exterior side of mass timber walls may be attached using galvanized nails of minimum 12 gage with a 7/16-inch head and sufficient length to penetrate the mass timber at least 1 inch .
The code also permits ASTM C1002 Type S, W, or G screws, but those screws must likewise penetrate the mass timber a minimum of 1 inch . Options C and D are therefore incorrect because they specify only 3/4- inch and 7/8-inch penetration, respectively. Option B is incorrect because it substitutes 16-gage nails for the minimum 12-gage requirement.
Section 722.7.2.2 additionally requires exterior Type X gypsum-board layers to be fastened 12 inches on center each way and 6 inches on center at joints or ends. Panel-edge fasteners must be located at least 1 inch and not more than 2 inches from the edge.
These fastening details are part of the conditions necessary to claim the protection contribution in Table
722.7.1(2).
References/Topics: 2021 IBC Sections 722.7.1 and 722.7.2.2; exterior Type X gypsum-board protection.
NEW QUESTION # 45
Which of the following is true regarding Type IV-B unprotected portions of mass timber ceilings and walls?
Answer: D
Explanation:
Type IV-B construction is fundamentally protected mass timber construction, but the 2021 IBC permits specifically limited areas of interior mass timber to remain exposed. Section 602.4.2.2.2 establishes two independent exposure limits. Unprotected portions of mass timber ceilings, including attached beams, are limited to 20 percent of the floor area of the dwelling unit or fire area. Unprotected portions of mass timber walls, including attached columns, are limited to 40 percent of that floor area . Accordingly, option C correctly states the permitted percentages.
These percentages do not operate in isolation. Exposed areas must also comply with Section 602.4.2.2.4, which establishes separation requirements between unprotected mass timber surfaces. Where both walls and ceilings are exposed within the same dwelling unit or fire area, Section 602.4.2.2.3 requires use of the mixed- unprotected-area equation rather than independently maximizing both percentages.
Option A describes neither Type IV-B nor its controlled-exposure concept. Option B incorrectly characterizes Type IV-B as requiring complete encapsulation. Option D reverses the ceiling and wall percentages.
References/Topics: 2021 IBC Sections 602.4.2.2.2, 602.4.2.2.3 and 602.4.2.2.4; Type IV-B permitted exposed mass timber.
NEW QUESTION # 46
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?
Answer: B
Explanation:
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.
NEW QUESTION # 47
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?
Answer: C
Explanation:
The figure depicts an unprotected portion of the mass timber ceiling . For Type IV-B construction, Section
602.4.2.2.2, Exception 1.1, limits unprotected ceiling areas-including attached mass timber beams-to 20 percent of the floor area of the applicable dwelling unit or fire area. Option B is therefore correct.
The percentage is based on floor area rather than total ceiling surface area. For example, where the associated fire area contains 1,000 square feet of floor area, the maximum ceiling exposure permitted under this particular exception would be 200 square feet, subject to the additional separation and mixed-exposure provisions.
The 40-percent value in option D applies to mass timber walls, including attached columns , rather than ceilings. The 15-percent and 30-percent values are not the prescribed Type IV-B ceiling exposure limitations in the 2021 IBC.
The inspector must additionally determine whether another exposed wall or ceiling region exists nearby.
Section 602.4.2.2.4 imposes a 15-foot separation requirement, and Section 602.4.2.2.3 controls situations where both wall and ceiling surfaces are intentionally exposed.
References/Topics: 2021 IBC Sections 602.4.2.2.2 through 602.4.2.2.4; Type IV-B ceiling exposure limitations.
NEW QUESTION # 48
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