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Building Codes and Standards Flashcards

7 cards from real CBI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Building Codes and Standards flashcards as text

  1. Under the IRC, what is the maximum riser height permitted for a stairway in a one- or two-family dwelling?

    Answer: 7-3/4 inches

    IRC R311.7.5.1 limits stair riser height to a maximum of 7-3/4 inches.

  2. What is the minimum tread depth required by the IRC for a residential stairway?

    Answer: 10 inches

    IRC R311.7.5.2 requires a minimum tread depth of 10 inches, measured nosing to nosing.

  3. Within a single flight of stairs, the IRC limits the difference between the largest and smallest riser to what amount?

    Answer: 3/8 inch

    The IRC allows a maximum variation of 3/8 inch between the greatest and smallest riser or tread in a flight.

  4. Under the IRC, handrail height measured vertically from the sloped plane of the tread nosings must fall within what range?

    Answer: 34 to 38 inches

    IRC R311.7.8.1 requires handrails to be between 34 and 38 inches above the tread nosings.

  5. An IRC stairway requires a handrail on at least one side when it has how many or more risers?

    Answer: Four

    IRC R311.7.8 requires a handrail on at least one side of each flight with four or more risers.

  6. What is the minimum headroom required over a residential stairway under the IRC?

    Answer: 6 feet 8 inches

    IRC R311.7.2 requires a minimum stair headroom of 6 feet 8 inches measured from the sloped nosing line.

  7. Under the IRC, guard openings must not allow passage of a sphere of what diameter?

    Answer: 4 inches

    IRC R312.1.3 prohibits guard openings that would allow a 4-inch sphere to pass, protecting small children.