In-Building Rainwater & Rainwater Outlets

In-Building rainwater drainage and rainwater outlets for Commercial and Public Buildings
Our in-building Terrain Gravity Rainwater drainage systems and Rainwater Outlets are used to drain flat roofs and balconies and convey water to underground drain or water re-use systems.


We would recommend using our Terrain Soil and Waste Systems or Terrain FUZE for this application, in conjunction with our Terrain Rainwater Outlets.

  • Siphonic Drainage Systems

    Our self-cleaning, high velocity Terrain HydroMax™ siphonic system provides an advanced roof drainage solution which can be used to drain large roof areas. Used on applications ranging from



View all

Terrain Soil & Waste Technical Manual

pdf (15.23 MB)

Terrain Drainage Price List

pdf (5.85 MB)