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| Section | Objectives |
|---|---|
| Topic 1: Mass Timber Materials | - CLT, Glulam, NLT, SCL and Engineered Wood Products |
| Topic 2: Fire-Resistance & Protection | - Concealed Spaces Protection - Fire-Resistance-Rated Assemblies - Noncombustible Protection & Encapsulation |
| Topic 3: Inspection Duties & Documentation | - Statement of Special Inspections - Inspection Reporting and Compliance Verification |
| Topic 4: General & Construction Types | - Construction Classification โ Type IV-A, IV-B, IV-C
|
| Topic 5: Construction Fire Safety | |
| Topic 6: Structural & Connection Inspection | - Connection Design and Protection - Framing and Structural Elements |
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NEW QUESTION # 31
Sealants used to resist passage of air in construction Type IV-A, shall be in accordance with which of the following standards?
Answer: A
Explanation:
ASTM C920 is the required standard for sealants used under the IBC mass timber air-sealing provision.
Option C is therefore correct. Section 703.7 applies to Type IV-A construction and requires compliant sealant or adhesive at specified interfaces involving fire-resistance-rated mass timber elements.
The sealing requirement reduces the movement of air, heat, and combustion gases into gaps that could expose additional timber surfaces and undermine the rated performance assumed by the approved design. The sealant must not merely appear to close the opening; it must be the specified product and installed within its approved joint dimensions and substrate conditions.
ASTM A36 is a structural steel material specification. ASTM E119 establishes procedures for fire testing building construction and assemblies but does not qualify elastomeric sealant products. ASTM F1667 covers driven fasteners such as nails, spikes, and staples and has no application to this sealing requirement.
Under Section 1705.20, installation is subject to periodic special inspection where the Section 703.7 sealant is applied. Inspection should occur before concealment and confirm continuity, adhesion, backing, joint depth, surface cleanliness, and compliance with the approved documents.
References/Topics: 2021 IBC Sections 703.7 and 1705.20; Type IV-A construction; ASTM C920.
NEW QUESTION # 32
For CLT, which of the following standards is used for the determination of bond line shear test for adhesives?
Answer: D
Explanation:
ANSI/APA PRG 320 is the governing product standard for performance-rated cross-laminated timber, including adhesive qualification, bond integrity, manufacturing quality control, and required product identification. Accordingly, option D is correct.
Bond-line performance is critical because CLT panels depend on structural adhesive to transfer shear forces between laminations and maintain composite action. PRG 320 establishes qualification and quality-assurance requirements intended to verify that adhesive bonds remain structurally reliable and resist delamination or inadequate bond development. Testing and manufacturing controls under this standard address the completed CLT product rather than treating the adhesive as an isolated material.
AITC 113 concerns dimensional tolerances and related requirements for structural glued-laminated timber rather than CLT bond-line shear qualification. ASTM C557 addresses adhesives for ceramic tile and is unrelated to structural timber manufacture. ANSI 117 is not the governing CLT manufacturing standard.
During inspection, the special inspector ordinarily does not reproduce factory bond-line tests on-site. Instead, the inspector verifies the CLT manufacturer's identification, certification marks, panel grade, layup designation, and conformance with PRG 320 and the approved construction documents.
References/Topics: 2021 IBC Section 2303.1.4; ANSI/APA PRG 320; CLT adhesive-bond qualification and manufacturing quality assurance.
NEW QUESTION # 33
Which of the following requires periodic special inspection of mass timber elements?
Answer: A
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 # 34
In mass timber construction of Type IV-B, each of the following is suitable for use as fireblocking except:
Answer: B
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 # 35
Combustible construction forming concealed spaces shall be protected with noncombustible protection with an assigned time of 40 minutes in which construction type?
Answer: D
Explanation:
The requirement applies to Type IV-C construction. Under the 2021 IBC provisions governing Type IV-C, combustible construction forming concealed spaces must be protected with noncombustible protection having an assigned protection time of not less than 40 minutes. Therefore, option C is correct.
The assigned protection time is determined using the protection-time values prescribed by the code, including the applicable values for gypsum board and other approved noncombustible materials. The provision is intended to delay ignition and involvement of combustible mass timber surfaces located within concealed spaces, where fire growth might otherwise remain undetected and become difficult for fire-suppression personnel to access.
Type IV-A and Type IV-B are subject to more extensive noncombustible protection requirements because those construction types support taller buildings and require greater protection of mass timber elements. Type IV-HT uses the traditional heavy-timber concealed-space provisions and may employ alternative methods, such as complete filling with noncombustible insulation.
During inspection, the special inspector must confirm that the installed layers, thicknesses, fastening patterns, joints, penetrations, and transitions collectively provide the required 40-minute assigned protection time.
References/Topics: 2021 IBC Section 602.4.3.5; Table 722.7.1(1); Type IV-C concealed-space protection.
NEW QUESTION # 36
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