Green roofs aren't just for city buildings or trendy eco homes—a green roof design is a practical way to improve your home and embrace environmental benefits.
Whether you’re keen to find more energy savings, manage stormwater runoff, reduce noise, or give your home a natural look, a green roof system can help. Still, it’s not as simple as just adding some soil and plants to your roof. Not sure what's involved? You might be surprised.
Vegetated Roof Gardens Strike a Chord With Many
The concept behind green roofs is simple: put vegetation on top of a building. But the benefits go far beyond looks. “The push for green roof technology stems from urbanization and an immediate need to build residential spaces in cities as metropoles grow to unprecedented levels," shared Audrey Sanders, Business Manager at Freudenberg Performance Materials. "While this rapid industrial growth occurs, green spaces diminish, as does air quality."
These roofs are built in layers. Typically, this includes a waterproof membrane, drainage, a layer of soil (or a lightweight growing medium), and plants like sedum. They work together to manage water, protect the building, and create insulation.
“Green roofs are vertical applications – where plants and vegetation are grown on the roofs and facades of buildings," highlights Sanders. "This not only improves air quality for residents and/or residents, renters and homeowners, but the atmosphere, as plants boost oxygen content, remove toxins and clean chemicals from the air."
She also points out the importance of materials: “To make an impact, though, quality materials are crucial. The subsoil plays an especially important role in making sure moisture and roots stay outside the building." The company touts its high-performance nonwovens made from recycled materials.
Should You Get a Green Roof?
They can save money, reduce outside noise, and even protect against flooding. The installation is especially helpful in cities, where space is limited and the air is often polluted.
“Green roofs offer numerous advantages, starting with their impressive energy efficiency. By improving your home’s insulation, they can help lower energy costs," notes Sanders. "Green roofs also improve air quality – a major benefit for folks living in urban areas – reduce noise in the home and can aid in stormwater management by absorbing rainwater and minimizing flood risk."
But not every home is a match. Before installing one, think through a few factors:
Climate
“Green roofs excel in areas with extreme temperatures, helping keep your home cool or warm," shared Sanders. "They're also highly effective in areas with heavy rainfall, as they can absorb that rainwater."
- Hot or cold climates: Helps with insulation
- Wet climates: Absorbs excess rainwater
- Very windy areas: May dry out or damage plants
Building regulations
“Be sure to check building regulations in your area prior to installation. Certain neighborhoods require permits or may restrict the technology altogether,” she adds.
Long-term goals
Think about whether you want a low-maintenance option or something more involved. Sedum green roofs tend to need less care, while others may require more frequent upkeep.
Green roofs offer a lot, but they work best when the setting is right—and when you go in with realistic expectations.
What to Know Before You Install One
Not every roof can support a green roof system. Your home needs to meet certain conditions before installation makes sense. “While green roofs sport a slew of benefits, they aren’t suitable for every home. It’s crucial to consider the feasibility before installing,” says Sanders.
Some things to consider:
- Roof strength: Have a structural engineer confirm your roof can hold the extra weight. Conventional roofs may need extra support.
- Slope: Works best for slightly sloped or flat roof structures.
- Drainage: Water needs to drain properly. Look for a system with an excellent drainage layer.
- Materials: Use lightweight, durable parts that include a reliable waterproof membrane for the roof surface.
- Plant choice: Make plant selections that are suited to your climate. Consider as many native plants as possible. Sedum is popular for being low maintenance, but a variety of plants can make your home feel like a botanical garden
- Warranty: A solid warranty can give you peace of mind.
“When speaking to installers, ask them if they have experience installing green roofs – as it’s a very nuanced process – and what the plan is for maintenance,” Sanders adds. “Green roofs require upkeep to operate efficiently and long-term.”
FAQ
Can a green roof be installed on an existing home?
Yes, but it depends on the structure. Have a green roof manufacturer check your roof’s load-bearing capacity. If the roof is strong enough, it’s possible to retrofit a residence, especially if you're using a lightweight sedum system.
What kind of maintenance requirements does a green roof need?
It depends on the system and the plant species. Some need just a few inspections per year to check for weeds, drainage issues, or dead plants. Others need regular care, like trimming and watering. Even minimal maintenance systems benefit from seasonal checks to keep things working properly.
