Green Roof Roof Drainage Concepts

Primary drainage systems are not designed to remove all of the water that falls on a roof during exceptionally heavy rain.

Green roof roof drainage concepts.

Zurn is proud to introduce its green roofing drain product line specifically suited for. The waterproofing membrane root barrier the drainage layer. Is not able to drain properly it can negatively impact the vegetation due to over. 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. On zero degree roofs a roof dam irrigation system can be installed which stores up to 40 mm of water. One of the main concerns that small scale builders have outlined to us is how to drain the roof. The green roof can be established on any load bearing components concrete tanbark wood.

Green roof solutions offers many different drainage layer options depending on system goals regarding water retention. Saturation of the soil. 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. Having proper drainage on a green roof is a critical aspect of the system.

The guide gives rational to the whys and hows of allowing free drainage. 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 growing medium substrate the plant layer. The roof garden build up allows for the realisation of a variety of design concepts even waterfeatures.

A green roof may require a separately plumbed secondary drainage system also known as the overflow relief system. The green roof consists of 8 superimposed layers 1 to 8. Design of drainage systems must be matched to the roof construction and catchment area. The load bearing component of the roof.

How to drain the roof. The most critical role of the drainage layer is to provide an adequate flow of water off the roof during and after rainfall.