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| Section | Objectives |
|---|---|
| Topic 1: Tall Mass Timber Building Code Provisions | - Types IV-A, IV-B and IV-C construction - International Building Code requirements for tall mass timber construction - Mass timber materials and construction requirements |
| Topic 2: Code Compliance and Related Requirements | - Sound transmission requirements - Energy code requirements applicable to mass timber buildings - Documentation and verification of compliance |
| Topic 3: Construction Fire Safety | - Protection of mass timber during construction - International Fire Code requirements - Construction-phase fire safety requirements |
| Topic 4: Special Inspection Requirements | - Inspection of connections and protective materials - Inspector duties and responsibilities - Special inspection procedures for tall mass timber buildings |
| Topic 5: Fire Protection and Fire-Resistance | - Fire protection systems and related provisions - Fire-resistance requirements - Noncombustible protection and protection of mass timber elements |
| Topic 6: Structural Inspection | - Connections and fastening systems - Mass timber structural elements - Structural loads and related code requirements |
>> 93-Tall-Mass-Timber-Buildings Test Questions Answers <<
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NEW QUESTION # 74
Concealed spaces in a Type IV-C building must be protected with:
Answer: D
Explanation:
In Type IV-C construction, combustible construction forming concealed spaces must receive noncombustible protection providing an assigned time of at least 40 minutes. Consequently, option D is correct.
Type IV-C permits substantial portions of mass timber to remain exposed within occupied interior spaces, subject to the applicable construction and fire-resistance requirements. That permission does not extend unchanged into concealed spaces. Concealed combustible surfaces create a different hazard because fire can spread above ceilings, inside shafts, or within service cavities without immediate detection. Section 602.4.3.5 therefore imposes a specific 40-minute noncombustible protection requirement.
An NFPA 13 sprinkler system is generally required for tall mass timber buildings, but sprinkler protection alone is not the prescribed substitute for this concealed-space protection. Fire-retardant-treated wood is still combustible and does not constitute the required noncombustible protective membrane. Option C is also incorrect because the concealed-space rule is more specific than the provisions governing exposed surfaces in occupied spaces.
Inspection should occur before closure so that membrane continuity, board orientation, fastener spacing, joint treatment, penetrations, and protection around connection hardware can be fully observed.
References/Topics: 2021 IBC Sections 602.4.3.2 and 602.4.3.5; Table 722.7.1(1); concealed combustible construction in Type IV-C buildings.
NEW QUESTION # 75
Periodic special inspection of sealants or adhesives shall be conducted where sealants or adhesives are part of a mass timber building element as designated in the approved construction documents.
All of the following statements are correct in reference to sealants or adhesives in mass timber buildings except:
Answer: C
Explanation:
Option C is the incorrect statement. The sealing inspection requirements in IBC Section 1705.20 do not automatically apply to every item classified as a "joint" under Section 202. They apply specifically where a sealant or adhesive required by Section 703.7 is installed on mass timber building elements identified in the approved construction documents.
Section 703.7 addresses abutting edges and intersections of fire-resistance-rated mass timber elements and intersections between mass timber and other materials where both elements require a fire-resistance rating.
These conditions require periodic special inspection because continuity of the air seal affects the fire performance assumed for the timber assembly.
Option A is correct: qualifying sealants must comply with ASTM C920. Option B is also correct: adhesives used for this purpose must comply with ASTM D3498. Option D reflects the required inspection of sealant applications at the prescribed abutting edges and intersections, although the technically precise term is "mass timber building elements." Fire-resistant joint systems are governed separately by IBC Section 715 and may require inspection under Section 1705.18. The two inspection categories must not be treated as interchangeable.
References/Topics: 2021 IBC Sections 703.7, 715, 1705.18 and 1705.20; ASTM C920; ASTM D3498.
NEW QUESTION # 76
Refer to the exhibit by clicking on the EXHIBIT button above.
In the detail shown, if the connections between the glulam beam and CLT panels all require a fire-resistance rating of one (1) hour and the wood cover is designed per AWC Technical Report 10 to provide the entire 1 hour of protection, what is the minimum thickness and number of layers required for the locations shown in red?
Answer: B
Explanation:
Two layers of 5/8-inch Type X gypsum wallboard are required for the condition shown, so option D is correct. The relevant AWC TR10 connection-protection methodology distinguishes between outer gypsum layers and the base layer immediately adjacent to the connection .
For 5/8-inch Type X gypsum board, an outer layer contributes 40 minutes. However, when gypsum board is being relied upon as the complete thermal-separation protection for a connection, TR10 reduces the contribution of the final/base layer to 50 percent. Therefore, the base layer contributes 20 minutes , while the second, exterior layer contributes 40 minutes . The total is:
20 minutes + 40 minutes = 60 minutes .
That satisfies the one-hour required protection period.
This is why simply looking at the normal 40-minute contribution of one 5/8-inch Type X layer would be incorrect for this connection condition. TR10 expressly uses the reduced base-layer contribution when gypsum constitutes the connection protection. The same methodology shows that four 5/8-inch Type X layers are needed for 120 minutes: 20 + 40 + 40 + 40 = 140 minutes, satisfying two hours.
References/Topics: AWC Technical Report No. 10, Sections 4.4.2 and connection-protection examples. TR10 states that outer 5/8-inch Type X layers provide 40 minutes each while the base layer provides 20 minutes.
NEW QUESTION # 77
Fire-resistance ratings of members and assemblies can be established by all of the following except:
Answer: B
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 # 78
Each of the following is true for special inspection of mass timber construction except:
Answer: B
Explanation:
Option A is the false statement. Under 2021 IBC Table 1705.5.3, bolted connections require periodic special inspection, not continuous special inspection.
The remaining three statements correspond directly to items contained in the table. Concealed connections are subject to periodic inspection. Erection of mass timber construction is also periodically inspected. For threaded fasteners, the inspector must periodically verify the use of pre-drilled holes where the approved design or manufacturer's installation requirements call for them.
The distinction between periodic and continuous inspection is fundamental. Periodic inspection means the special inspector observes the work at appropriate intervals sufficient to verify compliance. Continuous inspection requires the inspector to be present continuously during the performance of the regulated work.
Table 1705.5.3 reserves continuous inspection for the particularly installation-sensitive condition involving adhesive anchors installed horizontally or upwardly inclined to resist sustained tension loads.
For bolted connections, periodic inspection remains technically substantive. The inspector should verify bolt size and type, hole preparation, connection geometry, washers and nuts, required tightening, member condition, edge and end distances, and conformity with the approved structural drawings.
References/Topics: 2021 IBC Section 1705.5.3; Table 1705.5.3, Required Special Inspections of Mass Timber Construction.
NEW QUESTION # 79
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