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Technical Measurements 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 Technical Measurements flashcards as text

  1. Under the IRC, what is the maximum allowed difference between the tallest and shortest riser within a single flight of stairs?

    Answer: 3/8 inch

    IRC R311.7.5 limits riser and tread variation within a flight to 3/8 inch.

  2. A stairway has a total rise of 108 inches. What is the minimum number of risers needed to comply with the IRC maximum riser height of 7-3/4 inches?

    Answer: 14

    108 ÷ 7.75 = 13.9, so 14 risers are required, giving about 7.71 inches each.

  3. What is the minimum headroom required above stair treads in a dwelling under the IRC, measured vertically from the sloped plane of the tread nosings?

    Answer: 6 feet 8 inches

    IRC R311.7.2 requires a minimum stair headroom of 6 feet 8 inches.

  4. Required handrails on residential stairs must be installed at what height range, measured vertically from the sloped plane of the tread nosings?

    Answer: 34 to 38 inches

    IRC R311.7.8.1 sets handrail height between 34 and 38 inches above the nosings.

  5. What is the minimum clear space required between a handrail and the adjacent wall?

    Answer: 1-1/2 inches

    Handrails must have at least 1-1/2 inches of clearance from the wall to allow a proper grip.

  6. A Type I circular handrail must have an outside diameter within which range?

    Answer: 1-1/4 to 2 inches

    IRC R311.7.8.5 requires a circular handrail diameter of 1-1/4 to 2 inches.

  7. The triangular opening formed by the riser, tread, and bottom rail of a stair guard must not allow passage of a sphere of what diameter?

    Answer: 6 inches

    IRC R312.1.3 permits that triangular opening as long as a 6-inch sphere cannot pass.