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| Section | Objectives |
|---|---|
| Topic 1: Tall Mass Timber Building Code Provisions | - Special Inspection Requirements
- Type IV Construction
|
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NEW QUESTION # 40
Which of the following is true regarding fire-resistance rating protection provided by noncombustible covering material?
Answer: D
Explanation:
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.
NEW QUESTION # 41
Where Type X gypsum board serves as noncombustible protection for interior surfaces of wall and ceiling assemblies, all of the following code provisions are correct except:
Answer: C
Explanation:
Option D is the incorrect statement. IBC Section 722.7.2.1 requires the panel edges of the face layer , rather than the base layer, to be taped and finished with joint compound. Fastener heads on the face layer must also be covered with joint compound.
The other three provisions accurately reproduce the code. Each gypsum-board layer must be secured with Type S drywall screws long enough to penetrate the mass timber at least 1 inch when driven flush. Screws for the base layer are installed at 12 inches on center in both directions . Subsequent layers use the same general spacing but are offset from screws in the preceding layer. In addition, the panel edges of each succeeding layer must be offset 18 inches from the panel edges of the previous layer.
These details are not merely workmanship recommendations. They form part of the installation conditions under which the protection contributions in Table 722.7.1(2) can be credited.
References/Topics: 2021 IBC Section 722.7.2.1, Items 1-9; fastening, panel-edge offset, and finishing of Type X gypsum protection.
NEW QUESTION # 42
Which of the following requires continuous special inspection?
Answer: D
Explanation:
Adhesive anchors installed horizontally to resist sustained tension loads require continuous special inspection.
Therefore, option D is correct.
Continuous special inspection means that the special inspector must be present during the performance of the regulated work. This heightened oversight is necessary because horizontal or upwardly inclined adhesive- anchor installations resisting sustained tension are sensitive to installation variables such as borehole cleaning, adhesive proportioning, mixing, placement, embedment depth, temperature, cure time, and prevention of adhesive loss before curing. A concealed installation defect can substantially reduce long-term tension capacity.
The other listed activities are generally subject to periodic inspection under the mass timber special-inspection provisions. Periodic inspection allows the inspector to observe the work intermittently at appropriate stages rather than remaining present throughout the entire operation. Bolted connections, concealed mass timber connections, and anchorage of mass timber construction to deep foundation systems must still be inspected, but the code does not automatically designate each of those activities as continuous.
The inspector should also verify installer certification where required, approved adhesive-anchor evaluation documentation, expiration dates, storage conditions, drilling method, hole dimensions, and compliance with the approved structural documents.
References/Topics: 2021 IBC Sections 1705.3 and 1705.5.3; Table 1705.3; continuous inspection of adhesive anchors under sustained tension.
NEW QUESTION # 43
Periodic special inspection of sealants or adhesives as specified by the International Building Code Section
703.7 shall be conducted at which of the following locations?
Answer: B
Explanation:
IBC Section 703.7 requires sealant or adhesive to resist air passage at the abutting edges and intersections of mass timber building elements where those elements are required to be fire-resistance rated. Section 1705.20 then requires periodic special inspection where those prescribed sealants or adhesives are installed. Option C repeats that first required location accurately.
Option D is defective because the code requires sealing at an intersection between mass timber and another material only where both intersecting building elements are required to be fire-resistance rated. The phrase
"one or the other" materially weakens the condition. Option A is also too broad. A code-defined joint is not automatically subject to Section 703.7; fire-resistant joint systems are separately regulated by Section 715 and, where applicable, Section 1705.18.
Option B describes the exception in reverse. Sealant or adhesive need not be added under Section 703.7 where it is not a required component of the tested fire-resistance-rated assembly. When it is part of the listed or tested assembly, it must be installed accordingly, but that statement does not identify the primary location requested.
References/Topics: 2021 IBC Sections 703.7 and 1705.20; sealing of adjacent rated mass timber elements; periodic inspection.
NEW QUESTION # 44
All of the following combustible elements may be used in mass timber buildings except:
Answer: D
Explanation:
A conventional 2 ร 6 solid-sawn stud is a light-frame member and does not satisfy the minimum cross- sectional dimensions associated with mass timber or heavy-timber construction. Therefore, option A is the exception.
The IBC defines mass timber as Type IV structural elements primarily composed of solid, built-up, panelized or engineered wood products that meet the minimum cross-sectional dimensions required for Type IV construction. A nominal 2 ร 6 stud is substantially smaller than those dimensions and is ordinarily classified as conventional light-frame construction. Its use might be permitted in a particular nonstructural partition or another specifically authorized application, but it is not itself a qualifying mass timber structural element.
CLT is expressly recognized as a mass timber panel product. Parallel-strand lumber is a form of structural composite lumber and can qualify where it satisfies the applicable minimum dimensions, product-standard requirements and approved structural design. Dowel-laminated timber is a built-up panelized timber product and may likewise serve as a mass timber element when its dimensions, engineering and approval satisfy the construction documents and code.
The classification depends on the completed element's dimensions and approved structural function-not merely on the fact that it is manufactured from wood.
References/Topics: 2021 IBC Chapter 2 definitions of "Mass Timber" and "Conventional Light-Frame Construction"; Sections 602.4 and 2304.11.
NEW QUESTION # 45
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