What is the minimum size for a floor drain with an individual waste and vent in a residential laundry room?

The minimum size for a floor drain with an individual waste and vent in a residential laundry room is 2 inches. This size is established to ensure sufficient drainage capacity to handle the high volumes of water typically produced by laundry appliances, such as washing machines. Additionally, a floor drain of this size helps prevent clogs and facilitates the swift removal of water, which is especially critical in areas prone to flooding or spillage.

In residential settings, the International Plumbing Code and various local codes specify a 2-inch minimum to accommodate fixtures, ensuring proper flow rates and venting to prevent the trap from siphoning. A drain larger than 2 inches may not be necessary for a single laundry room; however, smaller drain sizes could lead to inadequate performance, potentially causing water backup or slow drainage due to insufficient flow capacity.