Green Roof Roof Drainage Concepts

The load bearing component of the roof.

Green roof roof drainage concepts.

This makes for lush plant growth on relatively thin substrate layers. Is not able to drain properly it can negatively impact the vegetation due to over. The most critical role of the drainage layer is to provide an adequate flow of water off the roof during and after rainfall. The guide gives rational to the whys and hows of allowing free drainage.

The growing medium substrate the plant layer. Primary drainage systems are not designed to remove all of the water that falls on a roof during exceptionally heavy rain. Zurn is proud to introduce its green roofing drain product line specifically suited for. 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.

The drainage capacity is tested according to en iso 12598. Design of drainage systems must be matched to the roof construction and catchment area. 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 unique needs of a green roof installation.

How to drain the roof. On zero degree roofs a roof dam irrigation system can be installed which stores up to 40 mm of water. Before commercial drainage layers were developed it was common practice to use a thin layer of gravel to act as a drainage layer. Green roof solutions offers many different drainage layer options depending on system goals regarding water retention.

The green roof can be established on any load bearing components concrete tanbark wood. The green roof consists of 8 superimposed layers 1 to 8. Saturation of the soil. One of the main concerns that small scale builders have outlined to us is how to drain the roof.

A green roof may require a separately plumbed secondary drainage system also known as the overflow relief system. The waterproofing membrane root barrier the drainage layer.