What diameter requirement must be met for floor drains?

The requirement for floor drains is that they must have a minimum diameter of 2 inches. This diameter is necessary to ensure that the drain can effectively handle water flow and prevent clogs. A diameter of 2 inches is typically sufficient to manage the expected volume of water from sources such as showers, washing machines, or other areas prone to pooling water. Additionally, adhering to this standard helps prevent overflow issues and allows for proper drainage, which is essential for maintaining hygiene and preventing damage to the surrounding areas.

While smaller diameters could potentially allow for some drainage, they would likely lead to increased frequency of clogs and insufficient drainage capacity, which can be problematic in practical use. A larger diameter would exceed the common requirements without providing additional benefits in most residential or commercial settings, thus making 2 inches the practical and code-compliant choice.