What is fixture unit value?

Fixture unit value refers to a numerical value assigned to plumbing fixtures based on their demand for water supply and drainage capacity. This system of measurement allows plumbing professionals to assess the potential load that different fixtures will place on a plumbing system. By using fixture unit values, plumbers can design and size the piping systems adequately to ensure proper flow and drainage, preventing issues such as backups or inadequate water supply.

For example, more frequently used fixtures, such as sinks and toilets, are assigned higher fixture unit values compared to less commonly used fixtures, such as bidets or laundry tubs. This quantification helps in understanding and predicting the overall demand placed on the plumbing system when multiple fixtures are in use simultaneously. Therefore, this value is crucial for efficient plumbing design and ensuring compliance with building codes and standards.