What is the price of a green roof?

Green roofs have been gaining popularity in recent years, and for good reason. As living space becomes increasingly limited, it makes sense to repurpose rooftops, which are often underused, for ecological purposes. A green roof not only provides extra green space but also contributes to better insulation for your home. If you're considering investing in this ecological trend, it’s important to understand the costs involved and the factors that influence the price.

Two Types of Green Roofs

There are two main types of green roofs: extensive green roofs and intensive green roofs. An extensive green roof is typically covered with grasses, mosses, and succulents. This type requires less maintenance and is lighter, which puts less pressure on the roof structure. On the other hand, an intensive green roof is usually planted with more complex vegetation, such as shrubs, flowers, and even trees. These roofs require more care and are heavier, leading to a higher installation cost.

Layers in a Green Roof

A quality green roof typically includes several layers that work together to protect the roof and support the vegetation. The first layer is the absorptive layer, which plays a crucial role in water management. It absorbs and retains rainwater, providing moisture for the plants and reducing the risk of water buildup on the roof. This layer can be made from organic substrates (such as peat, compost), mineral substrates (like gravel or sand), or synthetic materials (such as geotextile).

Next, there is the drainage layer, which prevents water from penetrating too deeply into the substrate, reducing the risk of infiltration and damage to the roof structure. The filtering layer ensures that dirt doesn't block the drainage pipes and prevents roots from penetrating the waterproofing membrane.

In some cases, additional layers are added for optimal protection and to improve the insulation.

The Cost of a Green Roof

The cost of a green roof varies depending on the type and size of the roof. For an extensive green roof, the average price is around 80 to 100 euros per square meter. This type of roof is ideal for those looking for a simpler, low-maintenance solution. In contrast, an intensive green roof, with larger and more complex plants, can cost up to 200 euros per square meter, due to the higher installation and maintenance requirements.

Roof Size

The size of your roof directly affects the price. The larger the surface area, the more materials and labor are required for installation. If you have a large roof, you may be able to get a discount based on the total area to be covered. It's advisable to compare quotes from different providers to get the best price.

Should You Do It Yourself or Hire a Professional?

If you have a green thumb and opt for an extensive green roof, you can try installing it yourself. This type of roof is relatively easy to install for an experienced DIYer. However, if you want a more complex design or want to ensure the installation is done correctly to avoid long-term problems, it's best to hire a professional.

Are There Any Subsidies?

Many municipalities offer subsidies for green roof installations. These grants can amount to up to 30 euros per square meter, significantly reducing the initial investment. Be sure to check with your local authorities to see if this financial assistance is available in your area.

The Benefits of Green Roofs

In addition to their aesthetic appeal, green roofs improve the thermal insulation of your home. By installing a green roof, you can lower your energy costs, as it helps insulate your home and regulate rainwater runoff. Furthermore, green roofs contribute to biodiversity and can enhance air quality in your environment.

Conclusion

The price of a green roof depends on several factors, such as the type of roof, the size of the area, and the complexity of the installation. An extensive green roof is a more affordable and low-maintenance option, while an intensive green roof requires more investment and care. Regardless of the type, the long-term benefits often justify the initial cost. Don’t forget to check for available subsidies in your area to help reduce the financial burden.