A steel stair rises 9 ft floor-to-floor with 6 in. risers. How many risers are required?
Correct Answer
A) 18 risers
Nine feet is 108 in.; 108 in. / 6 in. per riser = 18 risers.
Why This Is the Correct Answer
Nine feet is 108 in.; 108 in. / 6 in. per riser = 18 risers.
Why the Other Options Are Wrong
Option B: 16 risers
metal stair tread count, choice a: 16 risers counts a different spacing, panel, or repeated member quantity.
Option C: 20 risers
metal stair tread count, choice b: 20 risers is wrong because 20 risers counts a different spacing, panel, or repeated member quantity.
Option D: 24 risers
metal stair tread count, choice c: 24 risers counts a different spacing, panel, or repeated member quantity.
Memory Technique
Say the metal stair tread count rule aloud as a chain; the chain ends at 18 risers, not an intermediate stop.
Reference Hint
Open Steel Construction Manual, 15th Ed.; Steel Deck Institute and Steel Joist Institute standard practice; use the index entry or section for "Stair riser count" to confirm that Nine feet is 108 in.; 108 in.
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