Green Roof Roof Drainage Concepts

Is not able to drain properly it can negatively impact the vegetation due to over.

Green roof roof drainage concepts. The most critical role of the drainage layer is to provide an adequate flow of water off the roof during and after rainfall. Zurn is proud to introduce its green roofing drain product line specifically suited for. On zero degree roofs a roof dam irrigation system can be installed which stores up to 40 mm of water. Green roof solutions offers many different drainage layer options depending on system goals regarding water retention.

Before commercial drainage layers were developed it was common practice to use a thin layer of gravel to act as a drainage layer. These are collector drains that are designed to flow when only partly full. The waterproofing membrane root barrier the drainage layer. Permeability of granular drainage media for green roof systems green roofs with a purposegreen roofs with a purpose most benefits are derived from the moisture retained or circulating through green roofs thin profiles 3 inches temperate climates can achieve 90 of sought after benefits.

How to drain the roof. One of the main concerns that small scale builders have outlined to us is how to drain the roof. This makes for lush plant growth on relatively thin substrate layers. Primary drainage systems are not designed to remove all of the water that falls on a roof during exceptionally heavy rain.

The unique needs of a green roof installation. The growing medium substrate the plant layer. Saturation of the soil. The guide gives rational to the whys and hows of allowing free drainage.

A green roof may require a separately plumbed secondary drainage system also known as the overflow relief system. Design of drainage systems must be matched to the roof construction and catchment area. Having proper drainage on a green roof is a critical aspect of the system. 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.

The drainage capacity is tested according to en iso 12598. The roof garden build up allows for the realisation of a variety of design concepts even waterfeatures.