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Floor Construction — ICC B2 Practice Questions

13 questions · 8% of the ICC B2 exam

Worked questions

1. A commercial building is being constructed with a floor system that includes wood joists and plywood sheathing. Which of the following is the correct requirement for the minimum thickness of the plywood sheathing according to the 2021 International Building Code?

  • 3/4 inch thick plywood
  • B1/2 inch thick plywood
  • C5/8 inch thick plywood
  • D3/8 inch thick plywood

Exam tip

Always check the specific code section for the correct thickness requirements.

Why A is correct

The 2021 IBC requires that plywood sheathing used in floor construction be a minimum of 3/4 inch thick to provide adequate strength and rigidity.

2. A commercial building is being constructed with a wood floor system. The floor joists are 16 inches on center and are 2x10s. What is the minimum required thickness of the wood sheathing for this floor system?

  • A3/4 inch
  • B1 inch
  • 1 1/4 inch
  • D1 1/2 inch

Exam tip

Always check the specific joist spacing requirements for the minimum thickness of wood sheathing.

Why C is correct

According to Section 1604.1.1 of the 2021 IBC, wood sheathing for floors with joists spaced 16 inches on center must be a minimum of 1 1/4 inch thick. Option A is too thin, and options B and D are not the minimum required thickness.

3. A commercial building is undergoing a renovation, and the existing floor insulation is inadequate. What is the minimum R-value of floor insulation required for the occupied space according to the 2021 IBC?

  • AR-19
  • R-25
  • CR-30
  • DR-35

Exam tip

Always check the specific R-value requirements for floor insulation in occupied spaces.

Why B is correct

According to Section 806.1.1 of the 2021 IBC, the minimum R-value of floor insulation for occupied spaces is R-25. Options A, C, and D are not the minimum required R-value.

6. During an inspection of an existing commercial building, you notice that the floor joists are sagging. What is the first step you should take to determine the cause of the sagging?

  • AMeasure the joist spacing
  • Inspect the subfloor for damage
  • CCheck the floor joists for termite damage
  • DMeasure the floor joist depth

Exam tip

Remember that the subfloor can be a significant factor in joist sagging and should be inspected first.

Why B is correct

According to Section 1603.1 of the 2021 IBC, the first step in determining the cause of joist sagging is to inspect the subfloor for damage. This can help identify if the sagging is due to a problem with the subfloor, which can then be addressed accordingly. Options A, C, and D are also important but not the first step.

7 more in the bank

Answers and explanations for these are in the app.

  • A commercial building is being constructed with a floor drain. What is the minimum slope required for the floor drain according to the 2021 IBC?
  • A commercial building is being constructed with a floor that requires drainage. What is the minimum slope required for the floor according to the 2021 IBC?
  • A commercial building is being designed with a floor assembly that requires a fire rating of 1 hour. Which of the following fire-rated floor assemblies meets this requirement?
  • A commercial building is being modified to include a new floor above an existing floor. What is the minimum fire resistance rating required for the new floor assembly according to the 2021 IBC?
  • A commercial building is being used for a new occupancy that requires a higher load-bearing capacity. What is the minimum live load that the floor must be able to support according to the 2021 IBC?
  • During a renovation project, an existing floor requires the installation of a new opening. What is the maximum size of the opening allowed in a floor without additional structural reinforcement according to the 2021 IBC?
  • Which of the following R-values is required for the floor insulation in a commercial building according to the 2021 International Energy Conservation Code?

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