The notes indicate that multiple floor drains may share a trap only if they are in the same room and not located near which of the following?

The notes indicate that multiple floor drains may share a trap only if they are in the same room and not located near which of the following?

• A. Parkade
• B. Residential kitchen
• C. Office corridor
• D. Garage bay

Answer: (A)

The idea here is how floor drains and their traps behave when multiple drains share one trap. Sharing a trap is allowed only when the drains are in the same room and not exposed to conditions that can disrupt the trap’s seal or venting. A parkade introduces hydrocarbons and large, irregular runoff from vehicles, which can foul the trap or cause backflow/back-siphonage and odor issues if a trap is shared with other drains. To keep the trap seal reliable and avoids cross-contamination or sewer gases entering the space, drains near a parkade should not share a trap.

The idea here is how floor drains and their traps behave when multiple drains share one trap. Sharing a trap is allowed only when the drains are in the same room and not exposed to conditions that can disrupt the trap’s seal or venting. A parkade introduces hydrocarbons and large, irregular runoff from vehicles, which can foul the trap or cause backflow/back-siphonage and odor issues if a trap is shared with other drains. To keep the trap seal reliable and avoids cross-contamination or sewer gases entering the space, drains near a parkade should not share a trap.