If an obstruction is within 3 ft of the planned sprinkler location, what action is typically required?

If an obstruction is within 3 ft of the planned sprinkler location, what action is typically required?

• A. Install a larger sprinkler
• B. Install an additional sprinkler
• C. Move the obstruction
• D. Ignore the obstruction

Answer: (B)

When a object is close to a sprinkler head, it can block part of the water spray and create an uncovered shadow behind it. In low-rise residential systems, the 3‑ft clearance is used to ensure the sprinkler’s discharge pattern can reach the protected area. If something intrudes within that 3‑ft zone, a single head may not reliably cover the space. The practical fix is to add another sprinkler so the area around the obstruction still receives adequate water from a second discharge path. A larger sprinkler wouldn’t reliably solve the shadowing issue, and moving the obstruction isn’t assumed as a standard remedy in this scenario. Ignoring it would leave part of the space unprotected. Therefore, adding an additional sprinkler is the typical required action.

When a object is close to a sprinkler head, it can block part of the water spray and create an uncovered shadow behind it. In low-rise residential systems, the 3‑ft clearance is used to ensure the sprinkler’s discharge pattern can reach the protected area. If something intrudes within that 3‑ft zone, a single head may not reliably cover the space. The practical fix is to add another sprinkler so the area around the obstruction still receives adequate water from a second discharge path. A larger sprinkler wouldn’t reliably solve the shadowing issue, and moving the obstruction isn’t assumed as a standard remedy in this scenario. Ignoring it would leave part of the space unprotected. Therefore, adding an additional sprinkler is the typical required action.