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| Section | Objectives |
|---|---|
| Topic 1: Code Compliance and Related Requirements | - Documentation and verification of compliance - Sound transmission requirements - Energy code requirements applicable to mass timber buildings |
| Topic 2: Special Inspection Requirements | - Inspector duties and responsibilities - Inspection of connections and protective materials - Special inspection procedures for tall mass timber buildings |
| Topic 3: Fire Protection and Fire-Resistance | - Noncombustible protection and protection of mass timber elements - Fire-resistance requirements - Fire protection systems and related provisions |
| Topic 4: Structural Inspection | - Connections and fastening systems - Mass timber structural elements - Structural loads and related code requirements |
| Topic 5: Construction Fire Safety | - Protection of mass timber during construction - Construction-phase fire safety requirements - International Fire Code requirements |
| Topic 6: Tall Mass Timber Building Code Provisions | - International Building Code requirements for tall mass timber construction - Mass timber materials and construction requirements - Types IV-A, IV-B and IV-C construction |
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NEW QUESTION # 68
Which of the following construction Types permit concealed spaces to be protected by completely filling the concealed space with noncombustible insulation?
Answer: C
Explanation:
Type IV-HT construction permits concealed spaces where those spaces comply with the specific protection alternatives prescribed for traditional heavy-timber construction. One permitted method is to completely fill the concealed space with noncombustible insulation. Therefore, option D is correct.
This provision should not be confused with the concealed-space requirements applicable to the tall mass timber classifications-Types IV-A, IV-B, and IV-C. Those classifications employ dedicated noncombustible protection and assigned-time requirements intended to control the contribution of concealed combustible construction during a fire. Type IV-HT follows a different concealed-space framework and allows protection through approved alternatives, including sprinkler protection, gypsum-board enclosure, or complete filling with noncombustible insulation, as applicable.
The insulation must completely occupy the concealed volume. Merely installing partial batt insulation, leaving unprotected voids, or relying on nominally fire-resistant thermal insulation does not satisfy the provision. The inspector should verify the material's noncombustibility, continuity, placement around obstructions, and conformance with the approved construction documents before the space becomes inaccessible.
References/Topics: 2021 IBC Section 602.4.4; concealed spaces in Type IV-HT construction; noncombustible insulation protection method.
NEW QUESTION # 69
The time, in minutes, contributed to the fire resistance rating by the noncombustible protection of mass timber building elements, components, or assemblies, shall be established through a comparison of assemblies tested using procedures set forth in ASTM Standard:
Answer: C
Explanation:
The applicable standard is ASTM E119 , making option B correct. IBC Section 703.6 establishes a performance method for determining the number of minutes contributed by noncombustible protection applied to mass timber.
The methodology requires two otherwise identical assemblies to be evaluated using the procedures of ASTM E119 or UL 263 . Test Assembly 1 is tested without the protective covering. Test Assembly 2 incorporates the representative noncombustible protection, including its actual configuration, attachment details, joint treatment, accessories, and other relevant installation conditions. The protection contribution is then calculated by subtracting the fire-resistance time of the unprotected assembly from that of the protected assembly.
ASTM E119 is specifically designed to evaluate fire endurance of building construction and structural assemblies under standardized fire exposure. ASTM D3498, by contrast, is an adhesive specification referenced by the IBC for sealing certain mass timber interfaces. The other standards listed are not the prescribed comparative fire-resistance test for this determination.
References/Topics: 2021 IBC Sections 703.6 and 722.7.1; ASTM E119; UL 263; determination of noncombustible protection time contribution.
NEW QUESTION # 70
Each of the following is true regarding the fire-resistance rating for exterior bearing walls except:
Answer: D
Explanation:
Option A is the exception because the base fire-resistance rating for an exterior bearing wall in Type IV-C construction is two hours, not one hour. The values are established by 2021 IBC Table 601.
Type IV-A has the most stringent tall mass timber construction requirements and assigns a three-hour rating to exterior bearing walls. Type IV-B and Type IV-C each assign a two-hour rating. Consequently, options B, C, and D accurately state the Table 601 requirements, while option A understates the required rating by one hour.
The Table 601 value is the minimum construction-type rating. Exterior bearing walls must also comply with the exterior-wall requirements of Table 705.5 based on fire separation distance. Where another code provision requires a higher rating, the more restrictive requirement governs. The inspector must therefore avoid treating the two-hour Type IV-C value as an absolute maximum.
Field verification should include the approved wall assembly, mass timber dimensions, noncombustible exterior protection, membrane continuity, protection of connections, intersections, joints, and any required opening protection. An exterior bearing wall installed as a nominal one-hour assembly would not comply merely because the timber itself has substantial cross-sectional dimensions.
References/Topics: 2021 IBC Table 601; Sections 602.4 and 705.5; exterior bearing-wall ratings for Types IV- A, IV-B, and IV-C.
NEW QUESTION # 71
Which of the following is the best definition of Type IV-B construction?
Answer: B
Explanation:
Option D most accurately characterizes Type IV-B under the 2021 IBC. The default rule is that interior faces of mass timber elements-including the inside face of exterior mass timber walls and mass timber roofs- receive noncombustible protection. However, Section 602.4.2.2.2 permits specifically limited portions of walls and ceilings to remain exposed.
That combination of extensive protection plus controlled exposure is the defining practical distinction between Types IV-A, IV-B, and IV-C. Type IV-A requires essentially complete interior protection of mass timber surfaces. Type IV-B uses substantial noncombustible protection but permits limited exposed wall and ceiling areas under quantitative and separation restrictions. Type IV-C, by contrast, permits mass timber interior elements to remain unprotected generally, while retaining special requirements for exterior walls, concealed spaces, and shaft enclosures.
Option A therefore more closely describes the protection philosophy of Type IV-A. Option B invents a 50- percent rule that does not exist in the 2021 IBC. Option C more closely resembles the broad exposure philosophy of Type IV-C, though even that wording oversimplifies its specific requirements.
References/Topics: 2021 IBC Sections 602.4.1, 602.4.2 and 602.4.3; Type IV-A, IV-B and IV-C protection concepts.
NEW QUESTION # 72
Concealed spaces in a Type IV-C building must be protected with:
Answer: D
Explanation:
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.
NEW QUESTION # 73
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