Green Roof Layers

The clay and silt content of materials used in a rock aggregate drainage layer should be 10 per cent by mass.

Green roof layers. The soil can range from under 6 inches extensive to a few feet deep intensive. Get more informationabout extensive semi intensive and intensive green roof systems. Plants growing medium filter cloth drainage layer root barrier membrane. The layers of a green roof are as follows from top to bottom.

Often light weight mineral materials that have a high water retention capacity with good permeability are preferred. Older green roofs often used a permeable layer of rock aggregate such as scoria or gravel for drainage. Layers of a typical green roof. Waterproof membrane in many retrofit cases this layer already exists and depending on it s condition water tightness it may or may not need replacing.

Earth pledge starting from the existing roof deck and moving up the typical layers of a green roof system are. The rock aggregate should also have a suitable ph and be low in soluble salts to ensure plant growth is not adversely affected.