For scaffold platforms, what is the maximum allowable gap between planks or between a plank and uprights?
Correct Answer
C) 1 inch
OSHA allows maximum 1-inch gaps between scaffold planks and between planks and uprights to prevent materials or body parts from falling through.
Why This Is the Correct Answer
OSHA's scaffold standard (29 CFR 1926.452) specifies that gaps between scaffold planks and between planks and uprights must not exceed 1 inch. This limitation is critical to prevent tools, materials, or body parts from falling through the platform gaps.
Why the Other Options Are Wrong
Option A: 1/2 inch
1/2 inch is more restrictive than OSHA requires and would make scaffold construction unnecessarily difficult in practice. OSHA sets the maximum at 1 inch, not 1/2 inch.
Option B: 2 inches
2 inches is too large and would create a serious fall-through hazard for smaller tools and potentially fingers or feet. OSHA's 1-inch maximum exists precisely to prevent this level of gap.
Option D: 1-1/4 inches
1-1/4 inches exceeds the OSHA maximum of 1 inch. This option is designed to seem close to correct but would violate the standard.
Memory Technique
One rule, one inch: scaffold plank gaps = 1 inch max. Picture your thumb — it is roughly 1 inch wide. If your thumb fits in the gap, the gap is too big. Close it up.
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