Are Green Roofs Worth it?

February 6, 2023

Here at Roofers Birmingham, one of the key questions we get asked from property owners, looking to boost the eco credentials of their buildings is "are green roofs worth it?" Green roofs are also know as living roofs, eco roofs, roof top gardens etc and are covered with plants and other vegetation. In order to better educate our readers on green roofs, our roofers in Birmingham, discuss the pros and cons below. This, will hopefully allow you to make a more informed decision if you are thinking of installing one.



Advantages of Green Roofs


  • Improvement in roof drainage - drainage is an important component of any building. Green Roofers note that as a result of increased urban development, 75% of falling rainwater is running off into urban areas, heightening the risk of flash floods. Green roofs are an excellent way to combat this, the plants and vegetation absorb and store the falling rainwater, thereby improving the overall drainage of your roof.


  • Improvement in your roofs design life - roofs are continually exposed to the outside elements having to withstand wind, rain. snow ice, ultraviolet rays from the sun and fluctuating temperatures. All these factors can increase the wear and tear of a roof. Our roofers in Birmingham advise, the outer layer of vegetation on a green roof helps to protect the underlying roofing material from the outside elements. This, ultimately minimises the occurrence of wear and tear and increases the lifespan of your roof.


  • Maximises thermal efficiency - one of the primary advantages of green roofs is thermal efficiency. Poor insulation can lead to substantial heat loss in the winter, when you have the central heating turned on. However, a green roof helps to maximises thermal efficiency, by providing an extra layer with which to help keep heat locked inside your property. This layer of vegetation also helps to keep your building cool in the summer, by absorbing the suns energy and keeping it away from the roofing materials underneath.


  • Aiding the environment - carbon dioxide is one of the primary contributing factors to global warming. Reports from UKQBC show that 44% of total carbon dioxide emissions come from buildings. Green roofs help to counteract this as plants absorb CO2 during photosynthesis, and release only approximately half of it back into the atmosphere during respiration. Therefore, improving overall air quality. In addition, Roofers Birmingham, note garden roofs create a health habitat for birds, insects and other wildlife


Disadvantages of green roofs


  • Generally more expensive than traditional roofs - green roofs tend to be more expensive than traditional roofs because of the extra support, in the roof structure, that is required to support the load. However, given that green roofs have a longer design life and thermal efficiency the initial outlay should more than pay itself back.


  • Require more maintenance - plants and vegetation on a green roof will require maintenance in order to thrive. Roofers Birmingham recommend you treat your green roof as a garden and as such give it the same maintenance. This means feeding, watering and weeding the space. If you have the time and energy you could do this yourself, alternatively, you could employ a someone.


  • Extra weight load - the material constitution of green roofs makes them heavier, as such the correct structural support is required. Green Roofers note that garden roofs add an extra 50-200kg per metre squared to an exiting roof. Depending on the condition of your existing roof, additional structural reinforcement may be required.


Contact Roofers Birmingham today for professional roofing advice and your free competitive quote.

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