Green Roof Drainage Layer Thickness

Also the green roof drainage layer material is made to be sturdy and strong so that piercing can be limited and that the integrity of the entire program can be retained with ease.

Green roof drainage layer thickness. The drainage layer has an important role to play in the total system structure of a green roof. 25mm 1 thickness is standard for thin extensive roofs 40mm 1 5 is recommended for enhanced water storage and drainage on thicker extensive roofs and semi intensive roofs and 60mm 2 5 is available for maximum water retention on intensive roofs. The green roof drainage layer thickness makes sure that nothing can go wrong below offering a solid and effective guard. Intensive to describe green roofs that are thick enough.

Drainage protection filtration layer it is used for lightweight green roofs terraces and. Three thicknesses of drainage plates are available to meet the drainage and water storage requirements of almost any green roof. Older green roofs often used a permeable layer of rock aggregate such as scoria or gravel for drainage. It is common practice to use the term extensive to describe green roofs that are very thin and will only support hardy drought resistant vegetation such as sedums herbs and perennials.

The rock aggregate should also have a suitable ph and be low in soluble salts to ensure plant growth is not adversely affected. It buffers water and allows excess water to drain away. The drainage also contributes to good aeration of the plant roots.