What is OPTIGRUEN Green Roof Solutions?

Sunseap is the main distributor of OPTIGRUEN's patented green roof components and inorganic growing substrate for urban landscaping in South East Asia. Light in weight and cost effective, our green roof solution requires little to no maintenance and is able to extend the lifespan of your roof waterproofing membrane and beautify your roof, all at a subsidized cost (subject to meeting NParks' requirements).

Sunseap's green roof solutions serve to play a functional role towards urban sustainability and in enhancing the aesthetic value of your property. With more greenery, more carbon can be absorbed from the environment and thus reducing greenhouse gas emissions.


Reduces The Ambient Temperature

50% is absorbed and 30% reflected – creating a cooler and more pleasant climate. For indoor climate, this means air-conditioning systems doesn’t have to work so hard lowering the overall electricity bill.

Provides A Rainwater Buffer

A green roof absorbs rain water using the water buffering in the plants, substrate and drainage layer. This delays the discharge of rain water to the sewage system, purifies the rainwater and reduces the risk of flooding.

Extends Life Span Of Roof

A green roof protects the roofing materials from external elements such as sun, rain, wind and temperature fluctuations. Therefore, doubling and event tripling the life span of the roof of up to 60 years or even longer.


Report taken from www.nps.gov/tps/sustainability/new-technology/green-roofs/chicago-case-study.htm

Chicago City Hall
Chicago, IL

Building Constructed: 1911
Roof type: Semi-intensive, test/research
Size: 20,300 sqft
Year Installed: 2001

The green roof on the Chicago City Hall building was installed as part of an Environmental Protection Agency study and initiative to reduce the urban heat island effect in the city and improve air quality. The one–block wide, twelve–story building had a substantial roof area that was ideal for planting and data collection. The green roof only covers the City Hall half of the City Hall-County Building, allowing for comparative testing of the green roof and traditional roof.

As a semi–intensive green roof, a combination of 20,000 herbaceous plants, 112 shrubs, and 2 trees were planted. The growing medium varied from a depth of 3 inches for the extensive plantings to 24 inches for the intensive plantings, and the semi–intensive areas averaged 8 inches in depth. Sedums and grasses were planted in the extensive areas, shrubs and deeper rooted plants in the semi–intensive areas, and the two trees in the deepest, intensive areas. The intensive areas were installed on cantilevered platforms over structural columns to support the additional weight. Portions of the roof that were not planted are used to collect rainwater for periods of drought which is stored in two 150 gallon cisterns. A supplemental irrigation system was used to establish the plants and can provide further supplemental water during periods of extreme drought.

Initially the city wanted to make the green roof accessible to building users. Despite the height of the building, the very low parapets meant any railing, if not set back from the parapet, would be highly visible as well as pose safety concerns. A railing set further back from the edge of the roof would have also reduced the area available for the green roof. Currently the green roof is only accessible for maintenance.