HDB Car Park – Holland Drive, Singapore


To provide a range of products to facilitate the establishment of an extensive green roof on a re-inforced concrete rooftop of the Car Park that is attractive and offers effective thermal insulation to reduce urban heat island effects.


VersiDrain 25P drainage and water retention trays were installed over Evalon, a highly UV and root resistant thermoplastic sheet waterproofing membrane. Geotextile was laid over the VersiDrain 25P and EnviroMix GR lightweight inorganic planting media positioned evenly on top followed by planting of various drought tolerant and colourful plant species arranged in attractive patterns. Rainwater retained by the trays during wet periods, is returned to the planting media by capillary action, during dry spells to maintain healthy plant growth.