Our Norfolk Campus, built in 2011 has something special – a green roof. A green roof is partially or completely covered with vegetation, planted over a waterproofing membrane. Ours is considered an Extensive Green Roof due to the following: soil depth (3-6 inches), lightweight (15-50 lbs/sq. ft.), only 10 -20% organic matter in soil, limited plant species options, lower maintenance, nutrient, and irrigation requirements.
HOW DOES THE GREEN ROOF WORK
Our green roof has planted sedum, which is a succulent that absorbs lots of water. They are planted in five inches of shale, fine-grained rock. The plants roots and soil acts as a filter for rain water. When we have a light rain, the plants will just absorb the water. For heavier rain falls, the water leaves the roof through scuppers.
The green roof also has a system to collect condensation from the air conditioners. The condensation is then recycled through the drip irrigation system to water the green garden on the second floor.
HRT’s Norfolk Campus received its Gold LEED-certification in April 2015. The green roof and green garden were part of gaining the LEED-certification for the Norfolk Campus.