You are reviewing architectural plans that show a stairway with a 7.5-inch rise and 10-inch tread. A building official questions the design. What Florida Building Code requirement is likely being violated?
Correct Answer
D) Maximum riser height
The Florida Building Code limits residential stair risers to a maximum of 7.75 inches, but commercial stairs are typically limited to 7 inches. A 7.5-inch rise may exceed commercial requirements.
Why This Is the Correct Answer
The Florida Building Code sets maximum riser height limits for stairs. For commercial occupancies, the maximum riser height is typically 7 inches, while residential stairs allow up to 7.75 inches. A 7.5-inch rise exceeds the commercial limit of 7 inches, making this a code violation. The building official is correctly identifying that the riser height is too high for the applicable occupancy type.
Why the Other Options Are Wrong
Option A: Minimum tread depth
The 10-inch tread depth meets Florida Building Code requirements. Commercial stairs require a minimum tread depth of 11 inches, but residential stairs only require 10 inches minimum. Without knowing the occupancy type, the tread depth appears compliant for residential use.
Option B: Minimum headroom clearance
Headroom clearance is measured vertically above the stair treads and is typically required to be 6 feet 8 inches minimum. This measurement is independent of the riser and tread dimensions shown and would not be the primary concern with these specific measurements.
Option C: Handrail height requirements
Handrail height requirements are separate from stair geometry. Handrails must be between 34-38 inches above the nosing of treads. The riser and tread dimensions don't directly affect handrail height compliance, making this an unrelated code provision.
Memory Technique
Remember 'Lucky 7s': Residential risers max 7.75 inches, Commercial risers max 7 inches. The 7.5-inch rise is between these limits, so check occupancy type.
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