A recent report highlighted the evident Green roof trend that has swept many major cities and countries including Germany, US, Canada and Japan, and now Australia is quickly embracing the trend.

A heritage-listed building in Pyrmont (Sydney) recently got a 3,000sqm communal rooftop garden makeover. Melbourne's CBD is the latest to join in the green roof garden trend with plans to transform the CBD area into an urban skytop oasis which is reportedly well under way.

Known as 'living' roofs, today's modern roof gardens are said to improve a building's performance by creating healthy, ecologically responsible buildings.

Environmental, social and financial benefits of green rooftop gardens include:
  • helps to reduce heating and cooling by providing thermal control
  • improves noise protection
  • creates a desirable Green space
  • creates stylish outdoor living or entertainment areas, perfect for those business or staff meetings
  • contributes to the environment
Choosing the right waterproof membrane is also an important consideration when constructing green roofs.

According to the City of Melbourne, when planning a green roof (or wall), waterproofing and drainage of the existing structure and new green roof area should be factored in to ensure health and amenity of occupants below the roof is not compromised.

YourHome, a joint initiative of the Australian Government and the design and construction industries, states waterproofing membranes add to the structural capability of green roofs.

Sika Australia recently supplied its Sarnafil green roof waterproofing membrane for Australia's largest desalination plant which was built by the Victorian Government in Wonthaggi. The recently constructed green roof covers a total area of 26,000sqm and incorporates 100,000 plants, forming an important part of the project's landscape architecture. The Sika Sarnafil sheet applied membrane system helped to create a waterproof barrier for the lightweight, structural ply substrate. 

Sika offers a wide range of sheet applied waterproof membranes for extensive and intensive green roof applications:
  • Sarnafil® S Corner PVA 90°: made of premium-quality PVC by injection moulding procedure.
  • Sarnafil® G410 12L: a multi-layer, synthetic roof waterproofing sheet based on premium-quality polyvinyl chloride (PVC) with inlay of glass non-woven.
  • Sarnafil® G410 15L Non Felt: a multi-layer, synthetic roof waterproofing sheet based on premium-quality polyvinyl chloride (PVC) with inlay of glass non-woven.
  • Sarnafil® G410 20L Felt: a multi-layer, synthetic roof waterproofing sheet based on premium-quality polyvinyl chloride (PVC) with inlay of glass non-woven and polyester fleece backing.
  • Sarnafil® G476: a multi-layer, synthetic roof waterproofing membrane based on premium-quality polyvinyl chloride (PVC) with an inlay of glass non-woven.
  • Sarnafil® G410 18EL: a hot air weldable roof membrane, formulated for direct exposure and designed to use in all global climatic conditions. 
  • Sarnafil® G410 12L Felt: a multi-layer, synthetic roof waterproofing sheet based on premium-quality polyvinyl chloride (PVC) with inlay of glass non-woven and polyester fleece backing.
  • Sarnafil® G410 15L Felt: a multi-layer, synthetic roof waterproofing sheet based on premium-quality polyvinyl chloride (PVC) with inlay of glass non-woven and polyester fleece backing.