Green roof systems consist of waterproof roofing materials with vegetation on top. They are suitable for flat and low-sloped roofs.
There are three types of green roofs, each varying in price, maintenance, and growing capabilities. Intensive green roofs are ideal for creating garden and recreation space on buildings, while extensive green roofs are commonly found on residential structures.
To better understand the different types of green roof systems, here is a breakdown:
1. Intensive Green Roofs: These are suitable for creating gardens and recreational areas on building rooftops. They require more maintenance and are generally more expensive.
2. Extensive Green Roofs: These are commonly seen on residential structures and require less maintenance compared to intensive green roofs. They are also more cost-effective.
3. Semi-Intensive Green Roofs: These are a combination of intensive and extensive green roofs. They offer a balance between maintenance requirements and cost.
By considering these factors, you can choose the right green roof system for your needs.
Three types of green roofs exist: extensive, intensive, and semi-intensive.
Extensive green roofs have a shallow growing area of fewer than six inches. They house a limited variety of vegetation, such as mosses, sedums, and grass. Since there is no need for drainage or irrigation systems on extensive green roofs, they are the lowest maintenance and lowest cost option.
Intensive green roofs are more advanced, featuring deep soil, irrigation systems, and drainage. They are ideal for growing various plants and can be used to create recreation spaces on top of buildings.
Semi-intensive roofs are a meet-in-the-middle between intensive and extensive roofs. They feature deep soil, which allows for a variety of plants. They require a medium level of maintenance and are mid-priced.
Contents
How Are Green Roofs Installed?
Intensive green roofs have layers. Extensive and semi-intensive green roofs can be built-up or installed with a tray of soil and vegetation.
All green roofs require structural support for the weight of the soil, vegetation, and water, along with waterproof roofing membranes.
A typical intensive green roof has nine layers:
- Structural support
- Vapor control
- Insulation
- Roofing membrane support
- Waterproof and root repellent barrier
- Drainage layer
- Filter
- Soil/growing medium
- Vegetation
How Much Do Green Roofs Cost?
According to the EPA, an extensive green roof costs $10 per square foot, while an intensive green roof costs $25 per square foot. Maintenance costs average $0.75 to $1.50 per square foot per year.
The Pros and Cons of Green Roofs
Green roofs have advantages and some concerns.
Increased insulation – The soil and vegetation of green roofs reduce energy costs.
Longer lifespan of the roof – A roof covered in vegetation lasts longer than a typical flat roof.
Improved drainage – Green roofs absorb and release water at a slow rate for better drainage.
Improved air quality – Adding a green roof improves air quality.
Can create a recreation space – Intensive green roofs can create community gardens and recreation spaces in apartment buildings.
Structural load – Green roofs increase rooftop weight and require proper support.
Cost – Green roofs are more expensive to install and maintain than regular flat roofs.
Maintenance – Extensive green roofs are maintenance-free, but intensive roofs require care.
What Do Green Roofs Look Like?
Green roofs can take on various appearances, from rooftop vegetable growing areas to a layer of moss. Here are three examples.
Green Roof Provides Patio Space on Spa Roof
The green roof on this spa creates a yard-like entertainment area. Instead of using various plants, a layer of grass suffices for the patio setting.
Garden Shed with Green Roof
A green roof on a garden shed protects it from the sun and adds an organic look. Testing a green roofing system is ideal with a small building like this.
A green roofing system adds a decorative touch to the edge of this urban building’s roof, making the space feel more high-end and natural.
Frequently Asked Questions (FAQ)
How long do green roofs last?
Green roofs typically last 40 to 50 years but can endure longer based on location and maintenance.
Are green roofs worth it?
Green roofs can save thousands of dollars in energy costs over their lifespan as they enhance roof insulation and reduce energy bills. However, they do come with higher installation and maintenance expenses.
Can you put a green roof on a chicken coop?
Yes, you can put a green roof on a chicken coop as long as the roof is structurally sound. Ensure that the chickens cannot access the roof to avoid disturbing the plants and dirt.
Final Thoughts
Green roofs have practical benefits such as improving air quality, reducing heating and cooling costs, and extending the lifespan of flat and low-sloped roofs. There are three types of green roofs: extensive, intensive, and advanced systems. Extensive roofs require less maintenance while intensive roofs offer more flexibility for vegetation and recreation areas.
However, advanced systems require additional time and cost for maintenance.
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