HDB Car Park – Holland Drive, Singapore
To facilitate planting on the RC rooftop of the Car Park to provide a Green Roof both attractive and effective in reducing urban heat island effect.
VersiDrain 25P drainage and water retention trays were installed over the waterproofing membrane. Geotextile filter fabric was then laid over the VersiDrain 25P and a lightweight inorganic planting media, EnviroMix GR, positioned on top followed by in-situ planting of various colourful drought tolerant plant species arranged in attractive patterns. Water retained by the trays during wet periods is returned to the planting media by capillary action during dry spells and drawn upon by the plants to sustain vigorous and healthy growth.