What Is Green Roofing?

Posted by Justin Havre. on Thursday, December 11th, 2014 at 9:01pm.

Have you ever heard of green roofing? Did you even know that there was such a thing as a green roof? Well there is, and in today's environment anything that can be done to help keep this planet clean is a benefit that can't be overlooked.

What is a green roof?

A green roof allows vegetation to grow on top of a roofing structure that is man-made. It consists of a system for drainage, a system for repelling roots and a medium for growing plants.

Green roofs have been quite a popular item in Europe and are slowly making their way over to North America. Both businesses and homes can make use of green roofs to help protect the environment.

Calgary green roofs supply vegetation to the urban infrastructure without using up any ground space. It is just a simple matter of making good use of neglected space.


When you add plants to a rooftop they act as a natural insulator and help to reduce heating bills. They absorb water that would otherwise head to the drains, which helps take some of the pressure off the draining systems. They offer a natural retreat for birds and help to keep the city cool.

You can feel the heat in the city as sunlight is stored in the roofs and then released. With Calgary green roofs, the city would be cooled down and would certainly look a lot nicer from above.

There are 2 different kinds of green roofs. Extensive green roofs are lighter than intensive roofs since they weigh approximately 20 to 50 pounds per square foot. There is little maintenance required and they support groundcover that is hearty and native.

Intensive green roofs are heavier, weighing in at 50 - 90 pounds per square foot. They require structural support since they can hold trees, benches, shrubs and even walkways. They are like a miniature park on top of a building.

While Calgary is quite far away from having a green roof on every building in the city, it is something to look forward to the future.  As more people get on the environmental bandwagon, green roofs will become a popular trend that will be sure to last.

Leave a Comment