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| Section | Objectives |
|---|---|
| Tall Mass Timber Building Code Provisions | - Type IV Construction
- Structural and Connection Requirements
|
>> 93-Tall-Mass-Timber-Buildings Valid Test Pdf <<
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NEW QUESTION # 74
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: A
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 # 75
Refer to the figure by clicking on the EXHIBIT button above.
In Type IV-B construction, based on a 900 sq. ft. floor area, a 30 ' room width, and a 12 in. x 18 in. beam as shown in the Figure, the maximum length of the unprotected portion of the mass timber ceiling (dimension X) is _____ feet.
Answer: C
Explanation:
Section 602.4.2.2.2 permits unprotected mass timber ceilings in Type IV-B construction to equal no more than 20 percent of the floor area , and the code expressly states that attached beams are included when determining that exposed ceiling area.
The floor area is 900 square feet:
20% ร 900 = 180 sq. ft. maximum exposed area .
The exposed 12-inch ร 18-inch beam extends across the 30-foot room. Its three exposed surfaces consist of the 12-inch-wide bottom and two 18-inch-deep sides:
30 ft ร (1 ft + 1.5 ft + 1.5 ft) = 120 sq. ft.
Because the attached beam counts against the ceiling exposure allowance, only:
180 # 120 = 60 sq. ft.
remains available for the exposed ceiling itself.
The exposed ceiling extends across the 30-foot room width, so:
30 ft ร X = 60 sq. ft.
Therefore:
X = 2 ft .
Option A is correct. Ignoring the beam surfaces would overstate the permitted ceiling exposure and would contradict the explicit IBC requirement that attached beams be included in the exposed ceiling calculation.
References/Topics: 2021 IBC Section 602.4.2.2.2, Exception 1.1; Type IV-B exposed ceiling and attached- beam area calculations.
NEW QUESTION # 76
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 # 77
Refer to the exhibit by clicking on the EXHIBIT button above.
In the detail shown, what is the required screw spacing in inches for the CLT to glulam connection?
Answer: A
Explanation:
The connection detail specifies the CLT-to-glulam screws at 24 inches on center , so option D is correct. This is a construction-document interpretation question rather than a universal prescriptive screw-spacing requirement imposed by the IBC.
The approved structural detail controls the required spacing for this particular connection because the registered design professional has established the connection geometry and fastener schedule based on the applicable structural loads, CLT panel configuration, glulam member, fastener properties, and required load transfer. The 24-inch dimension must therefore be maintained in the field unless an approved revision changes the connection design.
IBC Table 1705.5.3 is directly relevant to the special inspector's responsibilities. For screws used in Type IV- A, IV-B, or IV-C mass timber connections, periodic special inspection includes verification of diameter, length, head type, spacing, installation angle, and installation depth . The special inspector is therefore expected to compare actual field installation against precisely this type of approved connection detail.
Substituting 12-, 16-, or 20-inch spacing without design authorization would constitute a deviation from the approved documents, even if the alternate spacing appeared more conservative.
References/Topics: Approved structural connection detail shown in the exhibit; 2021 IBC Section 1705.5.3 and Table 1705.5.3, inspection of screw spacing and installation.
NEW QUESTION # 78
Fire-resistance ratings of members and assemblies can be established by all of the following except:
Answer: A
Explanation:
ASTM E84 cannot be used to establish the hourly fire-resistance rating of a structural member or assembly.
Therefore, option B is correct.
ASTM E84 evaluates surface-burning characteristics , principally flame-spread and smoke-developed indices. Those measurements characterize how a material ' s exposed surface behaves when subjected to the standard tunnel test. They do not demonstrate that a wall, floor, roof, beam, column, or structural assembly will maintain integrity and structural performance for one, two, or three hours.
Fire-resistance ratings are instead established through the methods recognized by the IBC, including standard fire testing-principally ASTM E119 or UL 263-prescriptive rated construction provided by Section 721, and calculated fire-resistance procedures under Section 722. The code also recognizes appropriately documented approved designs and other approved methods within the Section 703 framework.
This distinction is particularly important in mass timber work because ASTM E84 may appear elsewhere in the code for flame-spread limitations on materials, but an acceptable E84 result does not establish structural fire endurance.
The special inspector must determine which approved fire-resistance methodology applies and verify that the installed assembly precisely reflects that design.
References/Topics: 2021 IBC Sections 703, 721 and 722; ASTM E119; UL 263; distinction between fire resistance and ASTM E84 surface-burning testing.
NEW QUESTION # 79
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