Changes

The green roof media used in Ontario can be classed according to proportion of composted biological material. Some existing installations  use materials which comply with FLL guidelines, whilst others use a much higher proportion of [[compost]].[http://grit.daniels.utoronto.ca/wp-content/uploads/2016/06/Comparisons-of-extensive-green-roof-media-in-Southern-Ontario.pdf]

The green roof media used in Ontario can be classed according to proportion of composted biological material. Some existing installations  use materials which comply with FLL guidelines, whilst others use a much higher proportion of [[compost]]<ref>Hill, J., Drake, J., and Sleep, B. (2016). “Comparisons of extensive green roof media in Southern Ontario.” Ecological Engineering, Elsevier B.V., 94, 418–426.</ref>.

ASTM International have a number of standards relating to various design considerations for green roofs. These standards provide good technical advice on the testing of systems and components.

ASTM International have a number of standards relating to various design considerations for green roofs. These standards provide good technical advice on the testing of systems and components.