Green Roof Roof Drainage Concepts

Saturation of the soil.

Green roof roof drainage concepts.

Before commercial drainage layers were developed it was common practice to use a thin layer of gravel to act as a drainage layer. This makes for lush plant growth on relatively thin substrate layers. On zero degree roofs a roof dam irrigation system can be installed which stores up to 40 mm of water. The guide gives rational to the whys and hows of allowing free drainage.

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. These are collector drains that are designed to flow when only partly full. Is not able to drain properly it can negatively impact the vegetation due to over.

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. Having proper drainage on a green roof is a critical aspect of the system. Design of drainage systems must be matched to the roof construction and catchment area. The green roof can be established on any load bearing components concrete tanbark wood.

The drainage capacity is tested according to en iso 12598. One of the main concerns that small scale builders have outlined to us is how to drain the roof. The waterproofing membrane root barrier the drainage layer. The green roof consists of 8 superimposed layers 1 to 8.

The load bearing component of the roof. Green roof solutions offers many different drainage layer options depending on system goals regarding water retention. Zurn is proud to introduce its green roofing drain product line specifically suited for. A green roof may require a separately plumbed secondary drainage system also known as the overflow relief system.

How to drain the roof. The roof garden build up allows for the realisation of a variety of design concepts even waterfeatures.