• RoofBlue raises the modules an additional 3.5” from the roof surface.  The riser void space is approximately 90.5%.
  • At 3.5”maximum water depth, RoofBlue provides up to 455 cubic inches (approximately 2 gallons or 7.4 litres) of water detention per square foot.
  • The control flow roof drain insert should be even to the lowest point of the green roof installation, the water will not exceed 3.5” in height.  This ensures that the plant roots are kept out of standing water.
A diagram showing the maximum water height in RoofBlue risers.