According to Cal/OSHA heat illness prevention requirements, shade structures must block at least what percentage of sunlight?
Correct Answer
B) 80%
Cal/OSHA requires shade structures to block at least 80% of sunlight and be large enough to accommodate all employees on cool-down rest.
Why This Is the Correct Answer
Cal/OSHA Title 8, Section 3395 specifically requires that shade must be present when temperatures reach 80°F or above, and the shade structures must block at least 80% of sunlight. The shade area must also be large enough to accommodate all employees on a rest or recovery period.
Why the Other Options Are Wrong
Option A: 75%
75% is not the Cal/OSHA standard. While it may seem close, the regulation sets a specific 80% minimum threshold. Using substandard shade that allows 25% of sunlight through would still expose workers to excessive radiant heat.
Option C: 50%
50% is far below the Cal/OSHA requirement and would provide inadequate protection. A structure blocking only half of sunlight would still allow significant radiant heat to reach workers during cool-down periods.
Option D: 95%
95% is above and beyond the requirement, but it is not the stated Cal/OSHA standard. While more shade is better, the regulation specifies 80% as the minimum—exam questions test knowledge of the exact regulatory threshold.
Memory Technique
80°F triggers shade requirements and 80% is the shade blockage requirement—same number for both triggers. '80 degrees = 80 percent shade.'
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