I went to another free public lecture recently. I hadn’t really heard too much about green roofs before, but I’m told it’s not a new idea – the vikings and others in history had green roofs.
The idea is that you have a strong roof with a layer of concrete, a layer of soil and a layer of greenery – like grass, plants, shrubs or veges!
It helps Urban Heat Island effect, where cities are warmer than rural areas due to sunlight reflecting off other buildings. It helps insulate the building, thus requiring less air-conditioning. It means there’s not as much water run off (although not a problem in Brissie at the moment!). It can even increase the life-span of the roof (just make sure it’s a structurally strong!).
In some countries there is legislation regarding green roofs, and there are lots of green roof ideas – tops of car parks, bus stops and dog houses, and green walls for really tall buildings.
So green roofs sound more sustainable than ice to me.