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| Section | Objectives |
|---|---|
| Inspection Duties & Documentation | - Statement of Special Inspections - Inspection Reporting and Compliance Verification |
| Mass Timber Materials | - CLT, Glulam, NLT, SCL and Engineered Wood Products |
| Construction Fire Safety | |
| 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
|
| Structural & Connection Inspection | - Connection Design and Protection - Framing and Structural Elements |
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NEW QUESTION # 58
Which of the following construction Types permit concealed spaces to be protected by completely filling the concealed space with noncombustible insulation?
Answer: D
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 # 59
Which of the following is an acceptable alternative for protecting structural connections from fire in Type IV- A, IV-B or IV-C construction?
Answer: B
Explanation:
Option D directly reflects the engineering-analysis method authorized by 2021 IBC Section 2304.10.1. For structural connections in Type IV-A, IV-B, or IV-C construction, the analysis must demonstrate that temperatures at every relevant portion of the connection remain within prescribed limits for a period corresponding to the fire-resistance rating required of the connected structural element.
The code establishes two critical temperature-rise limits: an average rise of not more than 250°F and a maximum rise of not more than 325°F . For this purpose, the "connection" includes the connectors, fasteners, and those portions of the wood members that participate structurally in the connection.
Option A is incorrect because ASTM E136 is a test for determining whether a material is noncombustible; it is not the fire-resistance test method for a structural connection. Option B is not a code-recognized substitute for the required connection fire evaluation. Option C is insufficient because a manufacturer's generalized fire- performance representation does not establish the required code fire-resistance duration unless supported through an approved test, evaluation, or engineering analysis.
References/Topics: 2021 IBC Section 2304.10.1; engineering-analysis method for Type IV-A, IV-B, and IV- C structural connections.
NEW QUESTION # 60
Each of the following is true regarding the fire-resistance rating for exterior bearing walls except:
Answer: C
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 # 61
Combustible construction forming concealed spaces shall be protected with noncombustible protection with an assigned time of 40 minutes in which construction type?
Answer: B
Explanation:
The requirement applies to Type IV-C construction. Under the 2021 IBC provisions governing Type IV-C, combustible construction forming concealed spaces must be protected with noncombustible protection having an assigned protection time of not less than 40 minutes. Therefore, option C is correct.
The assigned protection time is determined using the protection-time values prescribed by the code, including the applicable values for gypsum board and other approved noncombustible materials. The provision is intended to delay ignition and involvement of combustible mass timber surfaces located within concealed spaces, where fire growth might otherwise remain undetected and become difficult for fire-suppression personnel to access.
Type IV-A and Type IV-B are subject to more extensive noncombustible protection requirements because those construction types support taller buildings and require greater protection of mass timber elements. Type IV-HT uses the traditional heavy-timber concealed-space provisions and may employ alternative methods, such as complete filling with noncombustible insulation.
During inspection, the special inspector must confirm that the installed layers, thicknesses, fastening patterns, joints, penetrations, and transitions collectively provide the required 40-minute assigned protection time.
References/Topics: 2021 IBC Section 602.4.3.5; Table 722.7.1(1); Type IV-C concealed-space protection.
NEW QUESTION # 62
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: B
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 # 63
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