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Going Green: A Guide to Eco Roofing
Roofing technology is changing and it’s changing fast. Roofs don’t just keep out the elements any more - they are vital hi-tech agents in the battle against climate change. Welcome to the world of the eco roof...
Like the Barclays Building, more and more new buildings in Britain are boasting green roofs and it’s easy to see why. It lowers the use of air conditioning, reduces storm water run-off and provides a home for wildlife. But you don’t have to build a skyscraper to have one. As commercial ideas trickle down to residential projects, the use of organic roofs is becoming widespread as an alternative to traditional roofing materials like slate tiles or felt.
You could choose a system like Henry in his Oxford Grand Design that you can buy ready to roll out on your roof. It costs around £70 per square meter. But it really isn’t a big deal to do it yourself.
When creating your own eco roof it’s imperative to have it examined by a surveyor, because not all roofs are strong enough to support the weight of your planned greenery.
Firstly, you’ll need a layer to trap water. Secondly, a filter sheet is needed to prevent your soil running off with the rainwater. And thirdly, you’ll need your soil aggregate, typically containing about 20% soil and the remainder crushed brick and other lightweight, recycled materials that will allow water to penetrate effectively.
There’s no reason why green roofs shouldn’t last indefinitely, requiring very little maintenance. Most roofing materials are attacked daily by the sun’s UV rays, but opting for an eco roof will mean your structure is safe, while providing effective insulation and, of course, sucking some CO2 out of the atmosphere at the same time.
