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Roof/Ceiling Construction — ICC B2 Practice Questions

10 questions · 6% of the ICC B2 exam

Worked questions

1. A specifier is checking materials for a built-up roof under 2021 IBC 1507.10.2. Which compliance requirement applies?

  • AEvery base sheet must be exactly 3/8 inch thick regardless of product type.
  • The materials must comply with the standards in Table 1507.10.2 or UL 55A.
  • CThe materials need only match the roof insulation's thickness.
  • DAny material is acceptable if the roof has positive drainage.

Where to look it up

https://core-docs.s3.amazonaws.com/documents/asset/uploaded_file/3836/Lennox/3042180/2021_International_Building_Code.pdf

Why B is correct

The provision requires compliance with the referenced material standards or UL 55A. It does not impose the previously stated universal 3/8-inch base-sheet thickness. Product-specific material compliance remains necessary in addition to slope requirements. Source: 2021 IBC 1507.10.2; https://core-docs.s3.amazonaws.com/documents/asset/uploaded_file/3836/Lennox/3042180/2021_International_Building_Code.pdf

2. An enclosed attic is designed as a ventilated attic under 2021 IBC 1202.2.1. The 1/300 reduction exception is not used. What minimum net free ventilation area is required relative to the attic area?

  • A1/300
  • 1/150
  • C1/200
  • D1/250

Where to look it up

https://core-docs.s3.amazonaws.com/documents/asset/uploaded_file/3836/Lennox/3042180/2021_International_Building_Code.pdf

Why B is correct

The unreduced minimum is 1/150 of the ventilated space area. This concerns net free opening area, not a ratio selected simply from roof slope. Source: 2021 IBC 1202.2.1; https://core-docs.s3.amazonaws.com/documents/asset/uploaded_file/3836/Lennox/3042180/2021_International_Building_Code.pdf

3. A commercial building specifies wood shingles. Under 2021 IBC 1507.8.2, what is the minimum roof-deck slope for this covering?

  • A2:12
  • B1:12
  • 3:12
  • D1/4:12

Where to look it up

https://core-docs.s3.amazonaws.com/documents/asset/uploaded_file/3836/Lennox/3042180/2021_International_Building_Code.pdf

Why C is correct

Wood shingles require a slope of at least 3:12. This is a covering-specific requirement, not a universal rule for every steep-slope roof. Source: 2021 IBC 1507.8.2; https://core-docs.s3.amazonaws.com/documents/asset/uploaded_file/3836/Lennox/3042180/2021_International_Building_Code.pdf

4. A Type IIA building uses conventional non-heavy-timber roof construction. No Table 601 footnote exception or other rating modification applies. Under 2021 IBC Table 601, what minimum fire-resistance rating applies to the roof construction and its associated secondary structural members?

  • A0 hours
  • 1 hour
  • C2 hours
  • D3 hours

Where to look it up

https://core-docs.s3.amazonaws.com/documents/asset/uploaded_file/3836/Lennox/3042180/2021_International_Building_Code.pdf

Why B is correct

The roof-construction row in the Type IIA column specifies 1 hour. Footnote exceptions are excluded by the question. A commercial-use label alone does not prescribe a universal two-hour roof rating, and a higher rating is not automatically noncompliant. Source: 2021 IBC Table 601, p. 6-1; https://core-docs.s3.amazonaws.com/documents/asset/uploaded_file/3836/Lennox/3042180/2021_International_Building_Code.pdf

5. An existing commercial roof covering is water soaked and has deteriorated so that it is not an adequate base for additional roofing. Under 2021 IBC 1512.2.1.1, may a new roof covering be installed over it as a roof recover?

  • No; these conditions prohibit a roof recover.
  • BYes, if the new covering conceals all visible tears.
  • CYes, if one extra layer of insulation is added without addressing the existing condition.
  • DYes, because roof-recover restrictions apply only to residential buildings.

Where to look it up

https://core-docs.s3.amazonaws.com/documents/asset/uploaded_file/3836/Lennox/3042180/2021_International_Building_Code.pdf

Why A is correct

A recover is prohibited when the existing roof or covering is water soaked or too deteriorated to serve as a suitable base. This is a specific reroofing restriction, not a rule that every torn membrane automatically requires replacement of the entire roof. Source: 2021 IBC 1512.2.1.1; https://core-docs.s3.amazonaws.com/documents/asset/uploaded_file/3836/Lennox/3042180/2021_International_Building_Code.pdf

6. An underlayment not tested as part of a fire-resistance-rated roof assembly is proposed as an additional component. Under 2021 IBC 703.2.1.4, what is required?

  • AAccept it automatically because underlayments are exempt from assembly fire-resistance requirements.
  • Provide sufficient data to the building official showing that the required fire-resistance rating is not reduced.
  • CUse only its thermal R-value to establish fire-resistance compliance.
  • DAssume adding any layer always increases the assembly rating.

Where to look it up

https://core-docs.s3.amazonaws.com/documents/asset/uploaded_file/3836/Lennox/3042180/2021_International_Building_Code.pdf

Why B is correct

Supplemental materials not included in the tested assembly require supporting data showing no reduction in the required rating. The code does not create a blanket underlayment exemption, nor does it infer assembly performance from one component alone. Source: 2021 IBC 703.2.1.4; https://core-docs.s3.amazonaws.com/documents/asset/uploaded_file/3836/Lennox/3042180/2021_International_Building_Code.pdf

7. Under 2021 IMC Section 306.5, a catwalk provides the required access to mechanical equipment on the roof of a commercial building outside Group R-3. What is the minimum catwalk width?

  • 24 inches
  • B30 inches
  • C36 inches
  • D42 inches

Where to look it up

https://shop.iccsafe.org/media/wysiwyg/material/4751S21-Sample.pdf

Why A is correct

The roof-equipment-access provision requires a catwalk at least 24 inches wide, with railings as required for service platforms. This width is distinct from the minimum dimensions of the level service platform addressed by the sloped-roof provision. The original reference to IBC 1604.4 did not establish a universal 36-inch roof-walkway width. Source: ICC, 2021 International Solar Energy Provisions, CS306.5 (IMC306.5), printed p.CS3-6, PDF p.6; https://shop.iccsafe.org/media/wysiwyg/material/4751S21-Sample.pdf

3 more in the bank

Answers and explanations for these are in the app.

  • A commercial building is being constructed with a roof system that includes a wood deck and wood roof sheathing. Which of the following statements regarding the installation of the roof sheathing is correct?
  • An inspector is conducting an energy audit on a commercial building with a flat roof. Which of the following types of roof insulation is most effective in reducing the heat gain in the building?
  • During the inspection of an existing commercial building, the inspector notices that the roof insulation has significant water damage. What is the appropriate action required by the 2021 IBC Section 1402.4.1.1 for the repair or replacement of the insulation?

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