1. Vegetation Layer
Green roofs can have a variety of planting options; the system below is designed in accordance with this to ensure successful coverage is achieved. We supply many different vegetation layers ranging from fully established blankets (Sedum, wild flowers or grasses) that roll out like turf, plug plants, seeds and cuttings.
Substrate (the growing media) is the most important component of a green roof. Eco Green Roofs substrate has been carefully designed for each planting type. Fundamentally it must contain low levels of nutrients to keep the plants easy-to-maintain, hold a certain level of water yet be be free-draining to prevent root rotting and have a granular texture to keep the plant roots well aerated (vital for plant health). Substrate design is a science and a lack of knowledge is why a large amount of green roofs fail. A good substrate supports the whole green roof system and sustains the vegetation layer.
3. Filter Layers
Filter layers are very important in a green roof system. They hold the nutrients and fines within the system and stop them from being washed away by the rain.
4. Drainage layers
We have designed a range of our own drainage layers to complement the roof build-up and function effectively by draining excess water from the roof. Some of the larger drainage layers will also hold a reserve of water in specially designed cups so plants have access to it in drier periods. When needed, the roots will draw the water up by using evapotranspiration.
5. Root Barrier
A root barrier is used to separate the green roof system from roofing membranes. Generally we install root barriers on roofs that have been retrofitted with a green roof or if certain roofing membranes require extra protection.