Before revision: Sedum Green roof at the Battersea Power Station A green roof or living roof is a roof of a building that is partially or completely covered with vegetation and a growing medium, planted over a waterproofing membrane.
After revision: Sedum Green roof at the British Horse Society headquarters A green roof or living roof is a roof of a building that is partially or completely covered with vegetation and a growing medium, planted over a waterproofing membrane.