Insulation: Living Sedum Roofs

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. Roofs are integral to keeping heat in during winter and keeping it out in summer. Welcome to the world of the eco roof...

By Caroline Rodrigues

Why Have A Grass Roof?

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.

What Should I Do First?

When creating your own eco roof it's imperative to have it examined by a surveyor/structural engineer, because not all roofs are strong enough to support the weight of your planned greenery; the intensive type in particular is much heavier than a standard roof.

How Does It Work?

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.