What is a Green Roof?

green roof or living roof is a roof that is partially or entirely overlaid with vegetation planted over a waterproofing layer. It may also incorporate extra covers such as a root layer and drainage or irrigation systems.

Green roofs are used for proposes such as intercepting rainwater, contributing with insulation, creating an environment for wildlife, minimizing the stress by giving a more aesthetically pleasing view, reducing urban temperatures, and moderating the “Heat Island Effect”.

There are two types of green roofs: Intensive Roofs and Extensive Roofs.

Intensive Roof is thicker, with a minimum depth of 12.8 cm (5 1⁄16 in), and can sustain a more extensive type of plants but are heavier and need more care.

The Extensive Roof is shallow, reaching in depth from 2 cm (13⁄16 in) to 12.7 cm (5 in), lighter than the intensive one, and demands minimal care.

 

Types of green roof plants

  1. Low-growing succulents
  2. Herbaceous perennials
  3. Annual and biennial plants
  4. Turf
  5. Small shrubs
  6. Shrubs
  7. Trees

Benefits 

  • Decrease energy waste.
  • Reduce heating by adding volume and warm resistance.
  • Decrease stormwater flows via water-wise gardening methods. 
  • Build a natural habitat for animals such as insects, birds, bees, and butterflies in the middle of an urban desert. 
  • Decrease carbon emanation.
  • Increase the roof lifetime by over 200% by overlaying the waterproofing coating.