Proper soil selection is critical to the long term benefits of the living roof.
Roof garden soil depth.
If you re considering a rooftop garden there are a couple of directions you could go in.
Options for your rooftop garden.
This rooflite soil system supports lawn grasses that require deeper root space thrive on a soil with plenty of finer particles the precise amount of organic matter.
The targeted saturated weight of roof top growing media should be 48 65 lb ft 3 3 4 kg m 3.
Soil s saturated weight can reach 120 lb ft 3 7 5 kg m 3 which is far too high for roof gardening.
It depends on what you want to grow but generally speaking a depth of 20 25 cm 8 10 inches suffices to grow many vegetables and herbes but do investigate if your roof supports such a weight because a rooftop garden can become very heavy when it s soaked with water.
Stable structure for anchorage of plants root systems.
It supports the growth of the plants by providing the basic nutrients.
The following are some of the characteristics of the soil for the green roof.
Rooftop lawns are semi intensive green roofs with a total depth of at least 8 inches.