Whether you opt for an extensive or intensive green roof or a rooftop garden, the building’s structure should initially be designed to bear this extra load. The existing structure will need to be analyzed by an expert engineer who will specify what amount of additional weight can be added onto the roof.

If for instance you plan to use your roof as a terrace or a vegetable garden, you will be obligated to install a guardrail or a parapet with a minimal height of 3.5 ft. Additionally, you should obtain the proper information on applicable regulations which can vary in each municipality; some may require a guardrail installed several feet from the edge of the roof.

A green roof can be exposed to strong winds. A few construction elements such as a pergola or fixed lattice walls will protect the plants from strong winds while offering comfortable air circulation.