Green roofs in regenerative home design

Green roofs are an eco-friendly feature that not only enhances the beauty of a home but also actively contributes to the environment. 

As cities grow, the demand for sustainable and regenerative home design is becoming more important. Regenerative architecture goes beyond sustainability by creating buildings that help restore and improve the environment. Green roofs are a key part of this approach, providing a way to turn ordinary homes into eco-friendly, regenerative spaces.

Lew Geffen Sotheby's International Realty explores the concept of green roofs and how they are shaping the future of home design.

What is the difference between green architecture and regenerative architecture?

Green architecture focuses on minimising the environmental impact of a building through energy efficiency, eco-friendly materials, and sustainable practices. It’s about reducing harm to the environment. In contrast, regenerative architecture goes further by designing buildings that actively improve ecosystems. Instead of merely lessening the environmental footprint, regenerative homes can give back to the environment by purifying air, restoring biodiversity, and managing water resources.

What is a green roof?

A green roof, also known as a living roof, is a layer of vegetation planted over a waterproofing system on the top of a building. This can range from a small patch of greenery on a residential home to a full rooftop garden. Green roofs not only enhance the aesthetics of a home but also play a pivotal role in supporting regenerative design by improving energy efficiency, biodiversity, and air quality.

Types of green roofs

There are two main types of green roofs: extensive and intensive.

• Extensive green roofs: These are lightweight and support plants that don’t need much water or care, like drought-resistant vegetation. They have a thin layer of soil (up to 150mm) and are perfect for homes that can’t handle heavy loads. Extensive green roofs are popular for homes because they’re low-maintenance and still provide environmental benefits.
• Intensive green roofs: These are like rooftop gardens that can hold a variety of plants, including shrubs and small trees. They need a thicker soil layer (over 150mm) and more upkeep, such as watering and fertilising. Intensive green roofs can boost biodiversity and also serve as spaces for relaxation.

Benefits of green roofs for homeowners

Installing a green roof provides numerous benefits that align with both sustainable and regenerative design principles:

• Energy efficiency: Green roofs act as insulators, keeping homes cool in summer and warmer in winter, reducing the need for heating and cooling.
• Stormwater management: They absorb rainwater, reducing the burden on stormwater systems, and help filter pollutants from the water.
• Biodiversity: Green roofs create habitats for birds, bees, and insects, enhancing urban biodiversity.
• Air quality: Vegetation helps filter pollutants from the air, contributing to a cleaner and healthier living environment.
• Property value: A well-designed green roof can increase the aesthetic appeal and market value of a home.

How to design and implement a green roof in your home

Designing a green roof requires careful planning and professional guidance, especially when it comes to the structural integrity of your home. Here are some key steps to consider:

1. Consult with an architect or engineer: Ensure your roof can handle the additional weight of the vegetation, soil, and water.
2. Choose the type of green roof: Decide between extensive and intensive based on your budget, maintenance capacity, and desired aesthetic.
3. Select plants: Opt for drought-resistant, native plants for extensive roofs or consider more varied vegetation for an intensive roof.
4. Plan for irrigation: Intensive green roofs typically require a well-designed irrigation system, while extensive roofs may need less water.

Essential components of a green roof

For a green roof to function properly, it must include these essential layers:

- Waterproofing membrane: Protects the building from water damage.

- Root barrier: Prevents roots from penetrating the roof’s structure.

- Drainage layer: Ensures excess water is safely drained away.

- Filter layer: Prevents soil particles from clogging the drainage system.

- Growing medium (Soil): Provides a substrate for plant growth.

- Vegetation layer: The actual plants that cover the roof.

Step-by-step guide on how to install a green roof in your home

1. Prepare the roof surface: Ensure the roof is waterproof and structurally sound.
2. Install the waterproof membrane: This is the first layer of protection.
3. Add the root barrier and drainage layer: These protect the structure and manage water flow.
4. Lay down the filter layer: To prevent soil from washing away.
5. Add the growing medium: Use lightweight soil to avoid excess weight.
6. Plant your vegetation: Choose plants suited to your climate and green roof type.
7. Install an irrigation system (if necessary): Especially important for intensive green roofs.

Green roof maintenance and long-term care

Green roofs require regular maintenance to thrive. Extensive green roofs typically need annual weeding and occasional watering during dry periods. Intensive green roofs, on the other hand, demand more frequent attention, including pruning, fertilisation, and irrigation. Regular inspections should be carried out to ensure the waterproofing system remains intact.

The future of green roofs in regenerative architecture

Green roofs will play a critical role in the future of regenerative home design as they become more accessible and popular. As urban environments expand, the demand for regenerative solutions like green roofs will grow, allowing cities to become more sustainable, breathable, and self-sufficient.

Why it is important to encourage sustainable practices in home design

Encouraging sustainable practices in home design is no longer a luxury; it’s a necessity. Our homes must respond to environmental challenges, and green roofs are a powerful way to make a positive impact. By reducing energy consumption, supporting biodiversity, and managing water more effectively, green roofs offer a blueprint for how homes can contribute to environmental regeneration.

Your home should inspire you

At Lew Geffen Sotheby’s International Realty, we believe that your home should not only be a place of comfort but a source of inspiration. By incorporating regenerative design elements like green roofs, you can create a living space that not only supports your lifestyle but also contributes to a healthier planet. Let your home inspire you to embrace sustainable living, one green roof at a time. Contact a property practitioner today.