What you need to know before installing a green roof?

There are some important factors to consider to ensure that your green roof is successful and sustainable.


The good news is that green roofs are almost always possible, whether you have a flat or pitched roof. But, there are some important factors to consider to ensure your green roof is successful and sustainable. 

We give a brief overview of what you need to know.

Load-bearing capacity of the roof

A green roof can be heavy, especially when fully saturated with water. The roof must be strong enough to bear this extra weight without risking structural damage.
Don't have a clue about this? Get a structural engineer to assess the load-bearing capacity of your roof and to ensure that the roof can support the weight of the green roof, including the plants, substrate, and water. 


A 100% waterproof roof is crucial because a green roof retains a lot of moisture, which can cause leaks if the waterproofing is not good. Both roofing and EPDM are suitable for a green roof.

If you have doubts about waterproofing, you can always carry out a waterproofing test by flooding the roof surface with water for a certain period of time and checking for leaks.

Plant choice

Sufficient light is important for most plants on a green roof, as it is needed for photosynthesis and healthy growth. However, a green roof is also possible in shady conditions. By choosing shade-loving plants such as ferns and mosses, and using lightweight roof materials and good drainage, we can create a successful and attractive green roof even with less direct sunlight.

There is no reason not to opt for a green roof. With the right attention to bearing capacity, waterproofing, accessibility and plant choice, any roof - whether flat or sloping - can be transformed into a beautiful and sustainable green roof.

Table of contents

You might also find this interesting