LEED SOLUTIONS
With total project capabilities, National Roofing Company can help your project qualify for the maximum number of LEED credits.
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Considering the addition of a Garden Roof to your existing structure or new construction building? National Roofing Company’s team of experienced, certified Green Roof Contractors will work with you during the design phase to determine system weight requirements, then to address the differences between intensive and extensive garden roofs, plant selection, water management, and maintenance requirements in an effort to tailor the vegetated roof to climactic constraints and meet your overall project goals and needs.
Intensive Garden Roof
Intensive Garden Roofs are more elaborately designed roof landscapes and are often intended for human interaction. Different growth media types and depths allow for a larger selection of plants, including flowering shrubs and trees. Typical soil depths start at 6 - 8 inches and can reach 15 feet or more - the limiting factors here are roof loads and the client's budget.
Pathways, terraces, water fountains, ponds, and other architectural features result in beautiful and dramatic spaces. Depending on the plant selection, additional water collection cisterns, reservoir boards, irrigation, fertilization and/or maintenance may be necessary, just as it would be for a traditional garden.
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Extensive Garden Roof
Extensive garden roofs address a number of specific objectives including storm water management, energy conservation and heat island mitigation, in addition to providing a pleasing aesthetic.
Comprised of organic and inorganic growth media and specially selected hardy, low-maintenance plants, the best choice for extensive roof garden plants are those typically native to locations with dry and semi-dry grass conditions.
The average weight of a fully saturated minimum extensive green roof is 17 - 30 pounds per square foot, which is comparable to the weight of gravel ballast placed on many conventional roofs. While most commonly installed on flat roofs, extensive gardens can be retrofitted onto existing structures with a roof slope up to 33%, often with no additional structural support.
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