March 24th, 2023
Green roofs—also known as living roofs—are an innovative and eco-friendly solution that brings nature to the rooftop. From improved energy efficiency to stormwater management and urban biodiversity, green roofs offer both environmental and economic benefits. Here’s what you need to know before installing one on your commercial or industrial building.
What is a green roof?
A green roof is a layered system installed on top of a conventional roof that includes a waterproof membrane, root barrier, drainage layer, growing medium (soil), and vegetation. These systems can range from shallow, low-maintenance plantings (extensive green roofs) to deep, garden-like installations (intensive green roofs).
Pros and cons of green roof
Pros:
- Energy efficiency: Green roofs act as insulation, reducing cooling and heating costs.
- Stormwater management: Absorb rainfall, reducing runoff and strain on drainage systems.
- Air quality improvement: Filter pollutants and CO₂ from the air.
- Urban heat island reduction: Help cool cities and improve urban microclimates.
- Aesthetic appeal and usable space: Add beauty and function to rooftops.
- Extended roof lifespan: Protect the waterproof membrane from UV rays and temperature extremes.
Cons:
- Higher installation cost: More expensive than traditional roofing systems.
- Structural load: Buildings must be able to support the extra weight.
- Maintenance requirements: Regular weeding, irrigation, and plant care required.
- Limited plant options in certain climates: Not all species thrive in all regions.
How long does a green roof last?
A well-maintained green roof can last 40 to 50 years or more, often outlasting conventional roofing systems. The vegetative layer protects the roof membrane from harsh weather and UV exposure, extending its life significantly.
How much does a green roof cost?
Costs vary based on size, design, and type (extensive vs. intensive):
- Extensive green roof: $10 to $25 per square foot
- Intensive green roof: $25 to $50+ per square foot
While the initial investment is higher, long-term energy savings, potential tax incentives, and increased roof longevity make green roofs cost-effective over time.
How to build a green roof?
- Assess structural support: Ensure the roof can handle added weight.
- Install waterproof membrane: Protect the building from water damage.
- Add root barrier and drainage layers: Prevent plant roots from penetrating roofing material.
- Place filter fabric and growing medium: Use a lightweight, engineered soil.
- Plant appropriate vegetation: Choose drought-resistant and low-maintenance species.
- Set up irrigation and maintenance plan: Ensure ongoing care for long-term health.
Green roof installation should be handled by professionals experienced in both roofing and horticulture.
Green metal roof vs. Green roof
- Green metal roof: Refers to a roof made of metal that is painted green or designed for energy efficiency through reflective coatings. It’s a standard roofing system with no vegetation.
- Green roof: A living roof system with vegetation that delivers environmental and insulation benefits.
While both can improve energy efficiency, a traditional green roof offers broader environmental and aesthetic advantages.
Go green with Northeast Industrial Roof
At Northeast Industrial Roof, we design and install green roofing systems tailored to your property’s needs. From planning and structural assessment to final planting and maintenance, we ensure long-term success and sustainability.
Interested in bringing nature to your rooftop? Contact Northeast Industrial Roof today for a green roof consultation and discover the benefits of building greener.
