Intensive green roofs are the heavy-weights, literally, of the green roof world. In essence, they are parks or gardens on roofs and are commonly known as Rooftop Gardens. The word ‘intensive’ actually refers to the amount of input required to maintain a green roof. As parks and gardens, they need frequent maintenance, just as a park or garden needs to be tended on a regular basis.
Rooftop Gardens capture a great deal of water and are therefore good Sustainable Urban Drainage Systems (SUDS) for stormwater management. They also provide a good thermal barrier and depending on the planting can also be good for biodiversity.