Green roofs
Green roofs – roofing systems that support vegetation growth – are garnering interest as a cost-efficient, earth-friendly alternative to traditional roofs.
Long-term owner/operators such as government and large organizations are expected to be the first to adopt green roofs. Developers typically wait for proven consumer demand, which in this case is likely, as green roofs offer a good fit to the heightening interest in environmental stewardship, quality of life, sustainable design and ecological lifestyles.
The marketplace is primed for this innovation, which has huge potential for growth and job creation. The trend has already begun in Vancouver, where all civic buildings – including the Olympic Athletes Village at Southeast False Creek – are designated to be LEED Gold buildings, undoubtedly resulting in a booming green roof industry.
Green roofs typically fall into two categories
1. Extensive Green Roofs:
Low-maintenance ground-cover systems are ideal for large flat-roof buildings and apartments, but are also suitable for sloped residential roofs. Desert grasses and succulent plants are embedded in three-six inches of lightweight growing media. After one year, they do not require watering although annual spring weeding of tree seedlings brought in by birds is needed. In preparation for the 2010 sustainable Olympics, the Vancouver Convention Centre will have 2.4 hectares of very low maintenance green roofing.
2. Intensive Green Roofs:
Fully landscaped roof top gardens can accommodate many uses and require regular maintenance. Diverse plants and trees are planted in 8-12 inches of soil amid features such as walkways, railings and lighting. Parks, playgrounds or vegetable gardens are possible. In Greater Vancouver, Electronic Arts has a rooftop park, while the Vancouver Fairmont Hotel grows herbs on its rooftop for the hotel kitchen