Green Roof Drainage Options

They are pre assembled drain cores with root resistant filter fabric attached to top layer.

Green roof drainage options.

The most critical role of the drainage layer is to provide an adequate flow of water off the roof during and after rainfall. For flat or nearly flat roofs primary drains are located at the lowest point of the roof. Secondary overflow drains are located at a higher point on the roof. Flow of water into them is promoted by positive drainage.

Zurn offers a variety of roof drain solutions suited for modular green roofs such as the z163 and the 84 options both shown below. Grs drainage products include grs filter fabric grs drainage panels grs drainage layer composite cores and grs aggredrain. 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. If stone ballast is being utilized around the drain the 84 option shown above.

Think the hanging gardens of babylon. You should place the anchor elements directly above the drainage layer and filter fabric. A green roof may require a separately plumbed secondary drainage system also known as the overflow relief system. Green roof solutions can provide you with everything that you need for a successful green roof installation including.

Oddly enough though this style of green roof isn t a cool roof. Technically speaking the term green roof applies to a roof upon which living plants have been planted and nurtured. During a dry period the water stored can be reabsorbed by the vegetation layer above. The design of the different drainage layers allows for a portion of the stormwater to be retained above where the water is allowed to flow freely off of the roof.

It buffers water and allows excess water to drain away. Depending on regional precipitation rates and the water retention goals for your specific project green roof solutions has a full range of products to meet your needs. Green roof solutions offers many different drainage layer options depending on system goals regarding water retention. The drainage layer has an important role to play in the total system structure of a green roof.

They are pre assembled drain cores with root resistant filter fabric attached to top layer. Three thicknesses of drainage plates are available to meet the drainage and water storage requirements of almost any green roof. The drainage also contributes to good aeration of the plant roots. J drain grs 400 rb is our most popular drain products under planted areas on greenroofs.