What is the rule for soffits regarding width and sprinkler placement?

• A. Over 6 inches
• B. Soffits over 8 in require different sprinkler placement
• C. 8 inches or less
• D. Over 12 inches

Answer: (B)

Obstructions such as soffits can disrupt how the sprinkler spray reaches the protected space. When a soffit is wide enough, it blocks and shadows part of the spray pattern, so you can’t rely on a standard ceiling-mounted head position to provide full coverage.

That’s why the rule uses an 8-inch threshold: soffits over 8 inches require placing the sprinkler differently to ensure the water is distributed where needed and doesn’t get shadowed by the soffit. If the soffit is 8 inches or less, standard placement under the ceiling is acceptable because the spray can still reach the area effectively.

So the key idea is that wider soffits change the required sprinkler placement to maintain proper coverage, with 8 inches as the cutoff.