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| Section | Objectives |
|---|---|
| Tall Mass Timber Building Code Provisions | - Fire Safety and Fire Resistance
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>> 93-Tall-Mass-Timber-Buildings Valid Study Notes <<
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NEW QUESTION # 73
Refer to the figure by clicking on the EXHIBIT button above.
The exterior wall section shown in the Figure provides the prescribed noncombustible protection required by which Construction Type?
Answer: B
Explanation:
The illustrated wall corresponds to Type IV-A construction , making option A correct. The key indicator is the extensive Type X gypsum protection provided on the interior face of the CLT wall. Figure 63 shows multiple layers of 5/8-inch Type X gypsum board protecting the interior mass timber, together with the required exterior-side protection.
Type IV-A is the most comprehensively protected of the three tall mass timber construction classifications.
IBC Section 602.4.1.2 requires the interior faces of all mass timber elements , including the inside face of exterior mass timber walls, to be protected with qualifying noncombustible material. Section 602.4.1.2.1 requires the protection contribution to satisfy Table 722.7.1(1) and never be less than 80 minutes. Type IV-A exterior walls also require at least 40 minutes of noncombustible protection on the outside face.
The three interior layers shown are consistent with a heavily protected Type IV-A rated wall. By contrast, Type IV-B permits limited exposed interior mass timber, while Type IV-C expressly permits mass timber interior elements to remain unprotected. Type IV-HT operates under fundamentally different heavy-timber provisions.
References/Topics: 2021 IBC Sections 602.4.1.1, 602.4.1.2 and 602.4.1.2.1; Tables 601 and 722.7.1(1)-(2).
NEW QUESTION # 74
Refer to the exhibit by clicking on the EXHIBIT button above.
If the glulam beam and CLT panels all require a fire-resistance rating of 2 hours, what is the required fire- resistance rating in hours for the structural connections between the glulam and CLT?
Answer: B
Explanation:
The structural connections must maintain a fire-resistance rating corresponding to the required rating of the structural elements they connect. Because both the glulam beam and CLT panels require a two-hour fire- resistance rating, their connections must also provide two hours of fire resistance. Therefore, option C is correct.
Concealing steel hardware inside a timber member does not eliminate the fire-resistance requirement. Steel rapidly conducts heat and can lose strength, while timber surrounding a concealed connector can char, split, or withdraw from fasteners. The connection must consequently be protected through sufficient wood cover, noncombustible protection, tested assemblies, or an approved engineering analysis demonstrating acceptable connection temperatures and capacity for the entire required duration.
A three-hour rating is not required merely as a generalized safety factor; the code requires correspondence with the connected elements unless the approved design establishes another condition. A one-hour connection would create a premature weak point in the load path, and a zero-hour rating would be unacceptable simply because the hardware is hidden.
References/Topics: 2021 IBC Section 2304.10.1; fire-resistance rating of mass timber connections; protected concealed steel hardware.
NEW QUESTION # 75
Buildings of Types IV-A, IV-B, and IV-C construction designed to be greater than six stories above grade plane shall meet which of the following requirements for fire safety practices during construction?
Answer: D
Explanation:
Option A is an exact requirement of the 2021 International Fire Code Section 3303.5 . For Type IV-A, IV- B, and IV-C buildings designed to exceed six stories above grade plane, standpipes must be provided in accordance with IFC Section 3313, unless otherwise approved by the fire code official.
The IFC also requires a water supply for fire department operations, but that supply must be approved by the fire code official and fire chief; the code does not specifically mandate that it be a "portable" water supply.
Option B is therefore incorrect.
The remaining options alter important numerical requirements. Where noncombustible protection is required and construction exceeds six stories, at least one layer , not two, must be installed on applicable building elements more than four levels below active mass timber construction before additional floor levels are erected. Required exterior wall coverings are likewise required more than four levels below active mass timber construction, rather than two.
These safeguards reduce the amount of exposed combustible construction while ensuring that effective fire department infrastructure progresses with the building.
References/Topics: 2021 IFC Section 3303.5; Sections 3313 and related construction-stage fire protection requirements.
NEW QUESTION # 76
What fire-resistance rating is required for floors in Type IV-A, IV-B and IV-C construction?
Answer: B
Explanation:
IBC Table 601 requires floor construction and associated secondary structural members in Types IV-A, IV-B, and IV-C construction to have a two-hour fire-resistance rating. Therefore, option B is correct.
This requirement applies to the complete floor assembly, not only the timber panel. The required two-hour performance may be established through the calculated fire resistance of the mass timber, the contribution of approved noncombustible protection, or a permitted combination of both. Any topping, protective membrane, connection protection, and edge condition that forms part of the approved rated design must be installed accordingly.
The ratings for other building elements should not be transferred to the floor. A three-hour rating applies to the primary structural frame and bearing walls of Type IV-A, but its floor construction remains two hours.
Type IV-B and Type IV-C floors also require two hours, even though those construction types permit different degrees of exposed mass timber.
The special inspector must verify panel dimensions, approved layup, protection layers, joints, penetrations, connections, topping thickness, and other details that influence the floor's rated performance.
References/Topics: 2021 IBC Sections 601 and 602.4; Table 601, floor construction and associated secondary structural members.
NEW QUESTION # 77
Adhesives used to resist passage of air in construction Type IV-C, shall be in accordance with which of the following standards?
Answer: A
Explanation:
Adhesives installed to resist air passage at qualifying mass timber interfaces must comply with ASTM D3498.
Therefore, option C is correct. IBC Section 703.7 applies this requirement to Types IV-A, IV-B, and IV-C at prescribed abutting edges and intersections of building elements that require fire-resistance ratings.
ASTM D3498 addresses adhesives used for field-gluing wood-based structural components. Compliance is significant because the adhesive must retain adequate bond performance under the environmental and service conditions associated with the approved application. The special inspector should verify product identification, compatibility with the timber substrate, manufacturer instructions, storage conditions, shelf life, surface preparation, application temperature, coverage, and curing.
UL 263 is a fire-resistance test standard for building assemblies and structural elements; it is not the product standard for the adhesive. ASTM A653 applies to metallic-coated steel sheet. ASTM F1575 concerns pressure-sensitive safety glazing films and is unrelated to sealing mass timber interfaces.
Where the adhesive is required by Section 703.7, its installation is subject to periodic special inspection under Section 1705.20 unless the applicable code exception removes the sealing requirement.
References/Topics: 2021 IBC Sections 703.7 and 1705.20; ASTM D3498; Type IV-C sealing requirements.
NEW QUESTION # 78
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