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| Section | Objectives |
|---|---|
| Topic 1: Tall Mass Timber Building Code Provisions | - Mass Timber Products and Definitions - Type IV Construction
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>> 93-Tall-Mass-Timber-Buildings Test Dumps Free <<
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NEW QUESTION # 34
In mass timber construction of Type IV-C, the fire-resistance ratings of bearing walls are permitted to be reduced by _____ where supporting a roof only.
Answer: A
Explanation:
IBC Table 601, Footnote "a," permits a one-hour reduction in the required fire-resistance rating of the primary structural frame and bearing walls where those elements support a roof only. Option C is therefore correct.
For Type IV-C construction, the normal Table 601 requirement for bearing walls is two hours. Where a bearing wall qualifies as supporting only roof construction, application of the footnote permits that rating to be reduced from two hours to one hour.
The limitation "supporting a roof only" is critical. The reduction cannot be applied simply because a wall is located at the uppermost occupied level. If the wall carries a floor, mezzanine, transfer load, occupied rooftop structure, or another structural element beyond qualifying roof construction, the condition for the reduction is not satisfied.
Options A and B are not reductions prescribed by Table 601. Option D would effectively eliminate the entire normal two-hour Type IV-C bearing-wall rating, which the footnote does not permit.
For inspection purposes, the approved construction documents and structural load path must substantiate use of the reduction. The fire-protection installation should then be checked against the actual reduced rating specifically authorized by the design.
References/Topics: 2021 IBC Table 601, Footnote "a"; Type IV-C bearing walls supporting roof construction only.
NEW QUESTION # 35
Calculated mass timber fire resistance can include each of the following except:
Answer: B
Explanation:
Minimum prescriptive dimensions are not themselves a component added into a calculated fire-resistance time. Therefore, option A is the exception.
IBC Section 602.4 states that a mass timber element's required fire resistance can be based on the fire- resistance contribution of the mass timber, the noncombustible protection, or a combination of those two components. Options B, C, and D reflect those permitted approaches.
Minimum dimensions under Section 2304.11 serve a different function. They establish the minimum cross- sectional size and construction characteristics required for qualifying heavy timber or mass timber elements.
A member can satisfy the minimum dimensional requirement without automatically achieving every required one-, two-, or three-hour fire-resistance rating. The structural fire calculation must evaluate the remaining effective section after charring, elevated-temperature effects, applied loading, and any credited protective materials.
The inspector must therefore verify both requirements independently: the installed member must meet the minimum code dimensions and must match the approved fire-resistance design. Increasing a member to the minimum prescriptive size does not by itself replace the required calculation, tested assembly, or approved protection system.
References/Topics: 2021 IBC Sections 602.4, 703.2, 722.7 and 2304.11; calculated mass timber fire resistance.
NEW QUESTION # 36
In mass timber construction of Type IV-B, each of the following is suitable for use as fireblocking except:
Answer: D
Explanation:
A 7/16-inch wood structural panel is not one of the prescriptively acceptable fireblocking materials listed by IBC Section 718.2.1. Therefore, option C is correct.
Section 718.2.1 permits fireblocking to consist of several specified materials. These include one-half-inch gypsum board; properly secured batts or blankets of mineral wool, mineral fiber, or other approved materials; and mass timber complying with Section 2304.11. Options A, B, and D are consequently valid.
For wood structural panels, however, the IBC requires a substantially greater thickness: a single thickness of approximately 0.719 inch , conventionally represented as 23/32 inch, with joints backed by material of the same required thickness. A 7/16-inch panel is only approximately 0.438 inch thick and therefore does not satisfy that prescriptive fireblocking provision.
Fireblocking is intended to interrupt concealed draft openings and restrict the movement of flame and hot gases through concealed combustible spaces. It should not be confused with a tested firestop system used at penetrations through fire-resistance-rated assemblies.
Special inspection should confirm that the installed material, thickness, joint backing, retention, and location conform to the approved construction documents and the applicable code provision.
References/Topics: 2021 IBC Sections 718.2 and 718.2.1; Section 2304.11; permitted fireblocking materials.
NEW QUESTION # 37
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: B
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 # 38
The maximum allowable height for a Group E building of Type IV-A construction with an automatic sprinkler system in accordance with Section 903.3.1.1 is _____ stories.
Answer: D
Explanation:
The controlling provision is 2021 IBC Section 504.4 and Table 504.4, which establish the allowable number of stories above grade plane according to occupancy classification, construction type, and sprinkler protection.
The question identifies three controlling variables: Group E occupancy, Type IV-A construction, and an NFPA 13 automatic sprinkler system installed in accordance with Section 903.3.1.1.
In the Group E row, the sprinklered "S" value for Type IV-A construction is nine stories above grade plane.
Therefore, option D is correct. The three-story value applies to the nonsprinklered Type IV-A condition and must not be used because the question expressly states that the building is sprinklered. The six-story value corresponds to Type IV-B construction under the same sprinklered Group E condition, while the four-story value-although not listed as an answer-would apply to Type IV-C.
The special inspector should distinguish the story limitation in Table 504.4 from the separate building-height- in-feet limitation in Table 504.3. Both requirements apply concurrently; compliance with one does not permit the other to be exceeded.
References/Topics: 2021 IBC Section 504.4; Table 504.4, Group E, sprinklered Type IV-A construction; Section 903.3.1.1.
NEW QUESTION # 39
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