Green Roofing

Green roofs consist of live vegetation established on top of buildings.  It’s also known as a living roof, vegetated roof or eco-roof.

The plants and soil (or other material) sit on top of a synthetic waterproof membrane that protects the building from penetration of water, water vapour and roots.

Green roofs are green technology that is part of both green building and low impact development practices.

Green Roof Cross Section

How do green roofs work?

The plants and soil on a green roof capture and help filter rainwater when it rains. Rainfall that lands on a green roof eventually returns to the atmosphere through evaporation and through regular plant processes.

Green roof plants that are suitabe follow this criteria:

  • Drought-tolerant requiring little or no irrigation after plants have established.
  • Self-sustaining without the need for fertilizers, pesticides or herbicides
  • Able to withstand heat, cold and high winds
  • Very low-maintenance
  • Perennial or self-sowing

Renoteck Roofing installed this green roof on the garage of a new build in Calgary, Alberta.

Green roofs offer a number of hydrologic, atmospheric, thermal and social benefits for the building, people and environment:

  • Reduces the amount of stormwater runoff
  • Improves the quality of water that returns to the storm system
  • Reduces ambient air temperatures and increases humidity levels in the surrounding areas
  • Improve air quality: Filters and binds dust particles and filters airborne toxins
  • Increases energy efficiency (heating in the winter and cooling in the summer)
  • Increases building roof membrane life by protecting the underlying components against ultraviolet and thermal degradation
  • Increases aesthetic appeal and useable green space
  • Increases property value
  • Absorbs external noise pollution

Green Roofs can be installed on either residential or commercial flat roof buildings across Alberta. A new build or a roof replacement is the perfect time to consider using a green roof.