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| Section | Objectives |
|---|---|
| Topic 1: Fire Protection and Fire-Resistance | - Fire-resistance requirements - Noncombustible protection and protection of mass timber elements - Fire protection systems and related provisions |
| Topic 2: Construction Fire Safety | - Construction-phase fire safety requirements - International Fire Code requirements - Protection of mass timber during construction |
| Topic 3: Structural Inspection | - Mass timber structural elements - Structural loads and related code requirements - Connections and fastening systems |
| Topic 4: Tall Mass Timber Building Code Provisions | - Types IV-A, IV-B and IV-C construction - Mass timber materials and construction requirements - International Building Code requirements for tall mass timber construction |
| Topic 5: Code Compliance and Related Requirements | - Sound transmission requirements - Documentation and verification of compliance - Energy code requirements applicable to mass timber buildings |
| Topic 6: Special Inspection Requirements | - Inspection of connections and protective materials - Special inspection procedures for tall mass timber buildings - Inspector duties and responsibilities |
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NEW QUESTION # 17
Which of the following best describes the required protection for mass timber hoistway enclosure walls in Type IV-C construction?
Answer: C
Explanation:
Type IV-C generally permits interior mass timber surfaces to remain exposed, but shaft and elevator hoistway enclosures are a specific exception to that broad exposure allowance. Section 602.4.3.6 requires shafts, elevator hoistways, and interior exit stairway enclosures constructed with mass timber to receive noncombustible protection having a minimum assigned protection time of 40 minutes . Option A is therefore correct.
Critically, protection is required on both the inside and outside of the shaft enclosure . The 40-minute value is an assigned contribution from the noncombustible protection; the complete enclosure must still satisfy whatever overall fire-resistance rating is required by Sections 713, 713.4, Table 601, or other applicable provisions.
Option B incorrectly applies the general Type IV-C exposed-interior allowance to a specifically regulated shaft condition. Option C is incomplete because 1/2-inch Type X gypsum board provides only 25 minutes under Table 722.7.1(2), not the required 40 minutes. A 5/8-inch Type X board provides a recognized 40- minute contribution when installed in accordance with Section 722.7.2. Option D does not state the prescribed Type IV-C shaft requirement.
References/Topics: 2021 IBC Sections 602.4.3.2 and 602.4.3.6; Tables 722.7.1(1) and 722.7.1(2).
NEW QUESTION # 18
Which of the following requires periodic special inspection of mass timber elements?
Answer: D
Explanation:
Concealed connections in Type IV-C construction require periodic special inspection under 2021 IBC Table
1705.5.3, making option B correct.
The mass timber special-inspection table specifically applies to mass timber elements in Types IV-A, IV-B, and IV-C . Among the activities listed for periodic inspection are bolted connections, concealed connections, erection of mass timber construction, screw installation, verification of required predrilling, and several other connection-related installation characteristics.
Options A and C are incorrect because they specify Type IV-HT. Table 1705.5.3 is expressly scoped to Types IV-A, IV-B, and IV-C rather than Type IV-HT. Option D involves a listed Type IV-A activity, but its inspection frequency is wrong: adhesive anchors installed horizontally or upwardly inclined to resist sustained tension loads require continuous , not periodic, special inspection.
For concealed connections, inspection must occur while the relevant components remain observable. Once CLT panels, wood cover, gypsum protection, or finishes hide the connection, critical installation details may no longer be verifiable without destructive removal.
References/Topics: 2021 IBC Section 1705.5.3 and Table 1705.5.3, Required Special Inspections of Mass Timber Construction.
NEW QUESTION # 19
Mass timber is allowed in which of the following International Building Code Construction Types?
Answer: C
Explanation:
Mass timber can be incorporated into all five principal IBC construction types, although the extent and permitted application vary substantially. Therefore, option D is the technically complete answer.
Types III, IV and V provide the broadest opportunities for mass timber structural systems. Type III permits combustible interior building elements, Type IV is specifically organized around mass timber or noncombustible structural elements, and Type V permits structural elements of any material allowed by the code. Type IV includes the tall mass timber classifications IV-A, IV-B and IV-C, together with Type IV-HT.
Types I and II are predominantly noncombustible construction, but they are not absolute prohibitions against every wood or mass timber application. IBC Section 603 identifies permitted combustible materials in Types I and II. In addition, Table 601, Note c, permits heavy timber complying with Section 2304.11 for roof construction-including applicable primary structural frame members-where the required fire-resistance rating is one hour or less.
Consequently, the answer does not mean that a Type I or Type II building may be framed entirely with exposed mass timber. It means that code-compliant mass timber elements can be used in defined applications within each construction type.
References/Topics: 2021 IBC Sections 602.1-602.5 and 603.1; Table 601, Note c; Section 2304.11.
NEW QUESTION # 20
Refer to the exhibit by clicking on the EXHIBIT button above.
Given: The connections between the glulam beam and CLT panels all require a fire-resistance rating of 2 hours, and wood cover is designed per AWC Technical Report 10 to provide the entire 2 hours of protection.
The bearing area between the CLT and glulam is the minimum required.
What are the minimum dimensions, in inches, for the wood block shown in red?
Answer: C
Explanation:
Under the illustrated connection detail, the minimum wood-block dimensions are 3 inches by 3 inches.
Therefore, option C is correct.
The block is part of the sacrificial wood-cover system used to protect the connection for the full two-hour fire- resistance period. It must provide sufficient timber beyond the protected connection region to account for calculated charring and the increased exposure that can develop at the interface between abutting wood members. Because the problem states that the CLT-to-glulam bearing area is already the minimum required, the primary members do not provide surplus material that can be credited as additional protection at that edge.
AWC connection-fire-design guidance requires the protective geometry to remain effective after the calculated char front advances. Char contraction can open a gap at abutting edges and expose material deeper in the connection than would occur on an uninterrupted planar surface. The 3-inch-by-3-inch block maintains the required protective envelope for the stated two-hour condition.
This dimension is specific to the illustrated configuration and assumptions; it is not a universal minimum for every mass timber connection. The inspector must verify the approved detail rather than substitute nominal blocking based solely on field availability.
References/Topics: AWC Technical Report 10; AWC Fire Design Specification provisions for wood-cover protection and char contraction at abutting members.
NEW QUESTION # 21
Which of the following provisions for mass timber used for interior exit and elevator hoistway enclosures is true?
Answer: C
Explanation:
Option A correctly applies the protection requirements for mass timber used in qualifying interior exit and elevator hoistway enclosures. Where a two-hour, or 120-minute, fire-resistance rating is required, the noncombustible protection must contribute not less than two-thirds of that required rating. Two-thirds of 120 minutes is 80 minutes.
The 2021 IBC provisions for Type IV-A require interior mass timber surfaces to be protected with compliant noncombustible materials. The assigned protection time is determined under Section 722.7 and cannot be less than the applicable minimum. Option B is incorrect because 40 minutes would provide only one-third of a two-hour rating; Type IV-B protected mass timber generally requires at least 80 minutes for a two-hour element. Option C does not correctly describe the special protection path applicable to mass timber exit and hoistway enclosures. Option D is also incorrect because Type IV-HT is not governed by the tall mass timber enclosure provision stated in the question.
The inspector must verify the total assigned protection time, membrane type, number of layers, fastening, joints, corners, penetrations, and continuity on both required faces of the enclosure.
References/Topics: 2021 IBC Sections 602.4, 602.4.1.2 and 722.7.1; protection of mass timber shaft and exit enclosures.
NEW QUESTION # 22
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