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Bottom Outlet Gravity Wastes for Wet Rooms

Vertical drainage solutions for floor-based installations.

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Bottom outlet gravity wastes discharge vertically through the floor structure, making them the preferred solution where direct drainage into the floor below is achievable.

They are typically specified for use with wet room floor formers and screed floor constructions, where pipework can run directly downward into the drainage system. This configuration allows for efficient water removal with minimal resistance, improving long-term reliability.

From a design perspective, vertical discharge enables a more compact waste configuration, often allowing for greater flexibility in positioning within the shower area.

In accessible wet room installations, bottom outlet systems are commonly used where floor depths allow for adequate pipework and trap installation while maintaining the required gradient.

Correct installation must consider:

  • Minimum fall on outlet pipework
  • Trap accessibility for maintenance
  • Compatibility with floor former depth
  • When should a bottom outlet waste be used?
  • Is vertical drainage better than horizontal in wet rooms?
  • What floor depth is required for a bottom outlet waste?
  • Can bottom outlet wastes be used with vinyl and tile finishes?

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