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Be sure that cuttings are not budding or in flower; the plants will be putting much of their energy into reproducing and will not root as readily. Many jurisdictions (i.e. An Extensive Green Roof represents a natural form of vegetation that is largely self-sustaining and evolving. Conventional 'beehive' or 'bonnet' strainers are not suitable for this purpose. A third choice would be cold liquid-applied polyurethanes. In the United States, vegetative roof designs are generally regulated using existing standards for ballasted roofs. For more information on leak detection systems, refer to the WBDG Resource Page on Membrane Integrity Testing. The first objective is to design to avoid leaks. That being said, if you can do at-grade landscaping i.e. WBDG is a gateway to up-to-date information on integrated 'whole building' design techniques and technologies. As roof pitch increases above 4:12, a higher level of intervention is required to transfer the weight of the vegetative roof system to the structural framing system for the building. Fire properties of protection boards and thermal barriers over a steel deck or underlayment over a steel deck with a PMR are of particular importance, given the presence of combustible material associated with typical vegetative roof assemblies. The organic matter content should be based on the manufacturer's recommendations for the climate conditions, plantings and specific application. Many waterproofing experts recommend this membrane as the premiere waterproofing product, especially where there is an overburden (planting or paving) that is expensive to remove and where the spaces beneath are of importance. It is recommended that a root barrier protect all membranes. elmich In addition, in urban areas, up to 30% of total nitrogen and total phosphorus released into receiving waterways is derived from dust that accumulates on rooftops. In mild weather and with the assistance of temporary irrigation, Sedum cuttings can be relied on to generate a uniform ground cover. Preferably, these components are installed above the membrane in a protected membrane roof assembly (PMR) often referred to as an inverted roof membrane assembly (IRMA) as follows: If the deck is reinforced concrete, use reinforced, minimum 215 mil thick hot fluid-applied rubberized asphalt, applied directly to the deck, in a protected membrane roof assembly (PMR) often referred to as an inverted roof membrane assembly (IRMA). The capacity of vegetative roofs to moderate this runoff through both retention (water holding) and detention (flow-slowing) properties has been well-documented in Europe and increasingly in the United States. Many plants are not suitable for propagation in mats because they cannot tolerate the harvesting and shipping process. However, in general, the membrane or the membrane combined with the root barrier used in all vegetative roof applications should exhibit the following properties: Worldwide, modified bituminous membranes, PVCs and hot fluid-applied rubberized asphalts are the most common. Suppliers of pre-vegetative mats keep standard plant selections in inventory. Green Roof advisory services and Green Infrastructure consulting. In these developments, rainfall is captured on the vegetative roofs, returned to ground water through infiltration, and re-used for irrigation, toilet flushing, etc. Although there are shallower extensive Green Roof systems on the market, they are only resilient in specific climate zones. In general, initial plant densities should be greater than recommended for similar ground plantings. Adheres to deck, preventing lateral migration of moisture, Accurate control of kettle temperature required, Relatively new material, not as proven as systems above, Expanding core, activated by moisture, seals leaks, Not adhered to deck; lateral migration of moisture is possible. Generic Extensive Green Roof on a Concrete DeckImage courtesy of American Hydrotech, Figure 3. al., 2005; VanWoert et. Verify the integrity of the waterproofing membrane prior to installing the overburden. However, sufficient time for propagation must be provided when custom plant selections are desired. As a result, white EPDM may be difficult to test, as well as black EPDM. Also, in order to increase plant diversity, plugs can be installed into a foundation ground cover established using direct seeding or pre-vegetative mats. Waterproofing systems: Waterproofing is critical for protecting the structure from water intrusion. This mat should be of an interwoven type, rather than dimpled or high-hat, to limit the loss of R-value due to the presence of the mat. Careful selection of material properties, such as the water holding capacity and permeability rates of the growing media, can enhance annual runoff volume reduction and peak flow reduction capacity of the vegetative roof. Stone ballast or pavers are also used around roof access and rooftop equipment. This program has demonstrated that extensive vegetative roofs can achieve large reductions in nutrient releases from roofs; however, the research also shows that the correct choices of growing medium and plant types are essential for success. Some items to consider regarding warranties on a project-by-project basis: Are all features regarding the vegetative roof system, from waterproofing membrane to growth medium, being provided by a single-source manufacturer and installed by one contractor? The vegetation consists of various species which provide a long blooming period and set different accents throughout the vegetation period. However, this instruction does not address the specificity of this type of vegetated roof environment.). Available from. Where permanent irrigation systems are installed, include inspection and repair provisions in the ongoing maintenance. Although, extensive Green Roofs only partially restore the environmental footprint of a structure, it is proven to be the most efficient and most natural. But that takes water, and you might not always have some. by Charlie Miller, P.E., Roofscapes, Inc., now Studio Sustena The first concern of the designer when addressing drainage should be to insure that the system can efficiently percolate and discharge the underflow associated with mandated design storms. These systems are fully bonded to the deck. Finally, is the quality of construction the same? Hence, they do not allow an extensive vegetative roof in this configuration, because an extensive vegetative roof is less than 6 inches thick, by definition. The primary function is to keep fines from the growing media out of the drainage layer below. AMCOL International Building, Hoffman Estates, IL. Caution is urged regarding the use of single ply roof membranes manufactured in the United States in vegetative assemblies. First, the paradigm must shift away from thinking of vegetative roofs as 'regular' gardens, only elevated. In most climates, a properly designed 3inch deep vegetative roof cover will provide a durable, low maintenance system that can realize the many benefits that vegetative roofs have to offer. Where a project requires compliance with FM Loss Prevention Data Sheets, those requirements govern where they are more stringent than those noted herein. Other methods such as adhered or fastened edging, composite nailers, "stepped" EPS, etc. The plants can grow through the netting, but will hold the soil together. Trade organizations such as National Roofing Contractors Association (NRCA) are developing guidelines for waterproofing with vegetative roof installations in mind. There are many interactive factors that vegetative roof designers must take into account, balancing many considerations for optimal performance in each setting, including: During the design process, several professionals on the design team may need to participate. To account for the R-value reduction due to the minor water absorption that occurs in PMR roofs, it is recommended that the designer reduce the board's initial R-value by 10%. Standard landscaping work considers plant hardiness; tolerance for sun and shade; and preference for wet, dry, rich, poor, alkaline, or acid soils as the major concerns to influence plant selection. The mats incorporate a fiber, fabric or mesh reinforcing layer which prevents them from disintegrating during shipping and handling. Provide easily accessible inspection chambers in drainage outlets to ensure that the drainage system can be cleaned of roots, displaced growth media and ballast, dead foliage, and other debris, and otherwise be maintained. It should have a compressive strength suitable to carry the loads above (minimum 20,000 psf). They are lightweight and have a shallow build-up height. Provide a root barrier, as discussed elsewhere, to protect the membrane. Have a track record of use as waterproofing in buried applications. A capillary break layer is necessary on many if not most membranes to prevent water from sitting on the membrane and causing deterioration. Vegetative roof should thereafter be maintained by trained personnel at least twice a year. In these instances where the designer prefers the conventional configuration, membrane preferences should be either 80 mil reinforced PVC or 90 mil reinforced EPDM with all seams sealed and taped. Calculations are required to prove that the ballast is adequate in preventing uplift on a project-by-project basis. e.V. Specify a maintenance period long enough to ensure the initial establishment of healthy plants. The 2008 edition of the guide is available in English. A dead roof does nothing. Furthermore, air conditioning systems have a much greater effect due to the reduced heating. Many Western U.S. states have water rights laws that restrict how rainwater landing on a property may be used, as it is considered to be a water-of-the-state. Some succulents, including Sedum, can be established from stem pieces (cuttings). (FLL) in Germany Guideline for the Planning, Execution and Upkeep of Green-Roof Sites (Richlinien fr die Planung, Ausfhrung and Plege von Dachbegrnung). Note 2: FM Global allows a vegetated roof over a steel deck with an appropriate FM fire test and suggests (par. may also be employed. The "ideal" balance between a swift release of excess water, which is beneficial, and the risk of damage/degradation of certain materials, which is undesirable, should be sought. Sustainable pest management practices shall be employed before consideration of pesticides. Through evapotranspiration, infiltration into the ground, or using harvested water. 3 inches of lightweight green roof media, unirrigated. Filter fabrics should be 'root permeable.' ICC also provides standards for parapet heights and requirements for railings. The primary function of these composites is to retain and store water for future evapo-transpiration for the plants.

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