Green Roofs

Coberta Verda

A green roof (or "living" roof) is a roof of a building that is partially or completely covered with vegetation and a growing medium, planted over a waterproofing membrane. It may also include additional layers such as a root barrier and drainage and irrigation systems.

Green roofs serve several purposes for a building, such as recreational space for residents; increased benevolence and decreased stress due to the aesthetically pleasing landscape; longer-lasting roof; increased property values; possible tax breaks; lower electric bills; improved air quality; and reduced greenhouse gas emissions; reduced stormwater runoff; increased urban biodiversity; reduced heat island effect; and building soundproofing.

There are two types of green roof: "intensive" roofs, which are thicker, with a minimum depth of 12.8 cm, and can support a wider variety of plants but are heavier and require more maintenance, and "extensive" roofs, which are shallow, ranging in depth from 2 cm to 12.7 cm, lighter than intensive green roofs, and require minimal maintenance.

If you don't have any walking area on your roof or prefer a low maintenance green roof, go "extensive."

If the rooftop is walkable and you want to enjoy a garden, then a "semi-intensive" garden with some grasses and low shrubs, or an "intensive" garden with a thicker substrate of 50cm permitting many kinds of plant and even trees, can be possible.

Did you know that green roofs can cost the same as an insulated roof but have many more benefits?
The best time to install green roofs is when it is time to re-waterproof the surface.