Green roofs are extremely efficient when constructed correctly.
However, when basic technical elements are omitted, they can become a source of problems.
Below we will see the 7 most common mistakes that lead to failures – and how they can be avoided.
- Incorrect or Non-existent Study
A green roof is not “planting on a terrace”.
It requires:
- static adequacy check
- calculation of saturated substrate loads
- correct stratigraphy
- drainage study
The absence of a technical study is the most common cause of future problems.
- Inadequate Drainage
Poor drainage leads to:
- stagnant water
- excessive weight
- root rot
- waterproofing load
Certified drainage systems, such as those from Optigreen,
are designed to control water flow and retention with precision.
- Using the Wrong Substrate
Simple soil is not the solution.
A proper planted roof requires a light, stable, specially designed substrate, such as
ERSM – Ecoverti Roof Substrate Mix.
Incorrect substrate means:
- excessive weight
- poor drainage
- subsidence
- reduced plant growth
- Omission of Anti-Root Protection
Roots are looking for water. If there is no proper anti-root membrane, they can cause waterproofing perforation. This is one of the most expensive mistakes that can happen.
- Poor Plant Selection
Not all plants are suitable for a roof.
The following must be taken into account:
- wind
- solar radiation
- substrate depth
- microclimate
The wrong choice leads to constant plant replacement and increased maintenance costs.
- Incomplete or Non-existent Irrigation System
Even extensive planted roofs need controlled irrigation, especially in the Mediterranean climate.
The absence of automation leads to:
- dehydration
- uneven growth
- destruction of plant material
Modern systems with humidity sensors and remote control reduce errors.
- Underestimation of Maintenance
A planted roof is not “autonomous”.
It requires:
- drainage control
- fertilization
- irrigation regulation
- seasonal pruning
Proper maintenance ensures that the system will function for decades.
Conclusion
Most problems in green roofs are not due to the plants.
They are due to technical omissions.
A properly designed system, with certified stratigraphy and correct application, can operate without problems for many years.
Success lies in:
- in the study
- in the system selection
- in technical accuracy
- in the correct implementation
Do you want to avoid these mistakes?
ECOVERTI has experience in complex green roof projects in private and commercial properties, applying certified systems and modern techniques.
A green roof is not an experiment. It is a technical construction that must be done correctly from the beginning.