Green Roof Drainage Layer Thickness

Older green roofs often used a permeable layer of rock aggregate such as scoria or gravel for drainage.

Green roof drainage layer thickness. Three thicknesses of drainage plates are available to meet the drainage and water storage requirements of almost any green roof. It buffers water and allows excess water to drain away. 1 0 x 50 m. 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 drainage layer has an important role to play in the total system structure of a green roof. The clay and silt content of materials used in a rock aggregate drainage layer should be 10 per cent by mass. 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. The nominal thickness of a green roof is the approximate total height of the soil and drainage components that constitute the green roof system excluding the roof structure insulation waterproofing and plants.

Material of the drainage layer. The drainage also contributes to good aeration of the plant roots. Roll of 50 m. 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.

During a dry period the water stored can be reabsorbed by the vegetation layer above. The green roof drainage layer thickness makes sure that nothing can go wrong below offering a solid and effective guard. Weight of the drainage layer. 1 0 x 20 m.

Intensive to describe green roofs that are thick enough.