Green roofs comprise of a multi layered system designed to cover the roof of a building with vegetation or landscaping over a drainage layer. They are designed to intercept and retain rainfall, reducing the run off and attenuating peak flows. As well as the control of rainfall they improve air quality, improve ecological potential, insulate buildings against temperature extremes and can be retro fitted.
As part of the green roof system, whether they are intensive, extensive or simple intensive systems they all can add weight to a structure. By using HortagŪ horticultural medium either as the drainage layer under the vegetation or as part of the soil/growing medium a reduction in overall weight can be achieved. HortagŪ horticultural medium is approximately 50% of the weight of natural aggregate. The combination of its drainage properties and the high moisture retention properties makes it an excellent choice.
Green roofs provide an excellent first stage in a Sustainable Urban Drainage Systems (SUDS) and using HortagŪ horticultural medium in the Green Roof as well as LytagŪ LWA other areas of SUDS systems meet many of the sustainability requirements of today’s construction projects.
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Hortag® horticultural medium typical properties
| Absorption
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>20%
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| Voids Ratio
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>40%
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| Hydraulic Conductivity
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1.6x10-1 m/s
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| Aggregate Size (Nominal)
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6mm and 12mm
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| Oven Dry Loose Bulk Density
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700kg/m3
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| Weight When Fully Saturated
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87kg per 100mm thickness
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| Shape
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Rounded
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By using Hortag® horticultural medium either as the drainage layer under the vegetation or as part of the soil/growing medium a reduction in overall weight can be achieved. HortagŪ horticultural medium is approximately 50% of the weight of natural aggregate. The combination of its drainage and moisture retention properties makes it an excellent choice.
Dia 1.1 - Suggested intensive green roof build up
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