The Roof Must Not Collapse


What loads are possible without the roof collapsing?

We tend to work on standard weights for various items in the green roof build-up. These are all saturated loads expressed in kg/m2. It should be noted that if you were retrofitting onto an existing building, you would have to ask a qualified engineer to provide you with the additional load that can be applied to the existing structure. Then you can work out what is possible.

  • Approximate saturated weights are provided for various green roof approaches.
  • How you can calculate the potential size of timber you will need, however we clearly recommend you take professional advice to ensure that your structure can take the weight intended.
  • What waterproofing layer can be used and how best to this can be installed without needing a professional roof contractor.