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2024 International Residential Code (IRC)
Chapter 5 Floors

Quiz: 2024 International Residential Code (IRC) Chapter 5 Floors

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1. Which of the following is explicitly controlled by the provisions of Chapter 5 of the International Residential Code (IRC)?

Design and construction of walls for buildings.
Design and construction of roofs for buildings.
Design and construction of floors for buildings, including attic spaces housing mechanical equipment.
Design and construction of foundations for buildings.

2. According to IRC Chapter 5, what are the fundamental requirements for floor construction?

Capable of accommodating all loads per Section R301 and transmitting them to supporting structural elements.
Constructed with a minimum 2x10 joist size and 1/2-inch subfloor.
Designed exclusively for live loads not exceeding 40 psf.
Built with fire-resistance-rated assemblies in all residential areas.

3. How must sawn lumber used for load-supporting purposes be identified in accordance with IRC Chapter 5?

By a label indicating the species only.
By a grade mark of an accredited lumber grading or inspection agency.
By a stamp from the building official.
By a certificate from the lumber supplier.

4. What specific designation is required in the grade mark for end-jointed lumber used in a fire-resistance-rated assembly?

"Exterior Use Only"
"Structural Grade"
"Heat-Resistant Adhesive" or "HRA"
"Moisture Resistant"

5. Structural capacities and design provisions for prefabricated wood I-joists must be established and monitored in accordance with which standard?

ANSI A190.1
ASTM D5055
ICC 400
ANSI/APA PRG 320

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