Thermal insulation

In some cases, a green roof may include thermal insulation, typically a layer of extruded polystyrene. While this can be positioned below the roof deck, installation above the waterproofing (known as an inverted green roof) is preferred, as it further protects the membrane from condensation and physical damage. Advice should be sought from a building energy consultant to establish the value of additional insulation, considering the insulating properties of the green roof assembly, substrate and vegetation. Research has been conducted into green roof insulation values in Adelaide through the Building Innovation Fund of the South Australian Government.