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Green Roofs Introduction
Green roofs, also known as living roofs or eco-roofs are a thin layer of living vegetation installed on top of flat or very low sloped roofs. Green roofs protect roofs waterproofing systems while adding a wide range of ecological and aesthetic benefits. They are a powerful tool in combating the adverse impacts of land expansion and the loss of open space.
Green roofs are divided into two categories the first category, called the extensive green roofs, which is 6 inches or less and are commonly designed to please specific engineering and performance goals. The second category are intensive green roofs, which may become quite deep and merge into more familiar on-structure plaza landscapes with a lawn, large perennial plants, and trees. This guide states only the more shallow extensive green roofs.
The challenge in designing extensive green roofs is to replicate many of the benefits of green open space, while keeping them light but at the same time less costly. Therefore, the new generation of green roofs rely on the sciences of horticulture, waterproofing, and engineering.
The most common vegetated roof cover in temperate climates is a single un-irrigated 3 to 4 inch layer of lightweight growth media vegetated with succulent plants and herbs. In Germany, this simple design has demonstrated the highest benefit-to-cost ratio. In most climates, a properly designed 3-inch deep vegetated roof cover will provide a durable, low maintenance system that can realize the many benefits that green roofs have to offer.
PREFERRED PLANTS LIST
Allium schoenoprasum
Allium schoenoprasum
Delosperma nubigenum ‘Basutoland
Sedum acre 'Aureum'
Sedum album
Sedum album ‘Murale’
Sedum floriferum ‘Weihenstephaner Gold’
Sedum kamtschaticum
Sedum reflexum
Sedum sexangulare
Sedum spurium ‘Fuldaglut‘
Sedum spurium ‘John Creech’
Sedum spurium ‘Roseum’
Sedum spurium ‘White Form’
Talinum calycinum
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