RoofBlue DETAIN applications should be designed to hold no more than 3.5” of water beneath the green roof system.

Each inch of water weighs approximately 5.2 pounds per square foot, so at maximum water detention, the blue roof solution would add up to 18.2 pounds per square foot of load to the weight of the green roof modules (find saturated weights here).

The maximum saturated weight of the RoofBlue RETAIN system depends on the LiveRoof modules used:

  • <= 29.5 lbs/ft2 for Lite modules
  • <= 41.5 lbs/ft2 for Standard modules
  • <= 62.5 lbs/ft2 for Deep modules, and
  • <= 77.5 lbs/ft2 for Maxx modules