Multi-Unit Residential Houses and Garage Green Roofs
The following pictures are from an award-winning project which features green roofs on the semi-detached houses and on the 4-car garage. The extensive green roofs on the houses include 2.5″ of lightweight growing media (due to structural loading limitations) and a pre-vegeated sedum mat. The garage green roof is mostly semi-intensive which includes 7″ of lightweight growing media to support larger perennial plant species designed to attract butterflies, except for the cantilevered carport which has limited loading capacity and has an extensive green roof exactly like the houses. The diverse plantings on the garage green roof provide seasonal interest that residents can view through large rear windows. All green roof areas include automated irrigation systems with zones that can be controlled to meet the unique demands of different plants used on the green roofs and to ensure optimal plant establishment during the first few years, especially in periods of drought. The green roof area of the houses and garage total 1,400 square feet.
Residential Garage Green Roof
This 600 sf Green Roof includes a combination of extensive and semi-intensive areas. The extensive area contains 4″ of specialized growing media, is covered with pre-vegetated sedum blanket and is irrigated with pop-up spray heads at the perimeter. Te semi-intensive area consists of an 8″ curvilinear berm toward the back of the garage that is planted with native plants and irrigated with drip emitter hose. The taller plants at the back will add considerable visual interest throughout the year and screen unwanted views beyond. As part of a LEED project, storm water captured in a cistern beneath the garage is used to irrigate the green roof during severe drought periods.
Terrace Green Roof
This 2nd storey green roof terrace is extensive (less than 4″ of growing media) due to weight limitations and includes all native plants. A notable challenge with this project was getting plants that could survive the extreme light conditions on the rooftop (total shade to full sun), yet provide visual interest all year long. Below are contract drawings of the green roof layout and irrigation system with details as well as pictures of the finished project.
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