green roofs information

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evergreen roof gardens

Why have a green roof?

There are many different reasons why green roofs are important to us. Firstly, as global warming becomes more and more of an issue, and towns and cities expand, green space is becoming more and more important. Green roofs are particularly useful at filtering out pollutants from the air and as such, purifying it. This ensures a greater quality of life for everybody. Also, with the increase in building work, the natural habitats of many small animals and insects are being destroyed; green roofs provide a haven for this type of fauna, thus increasing their chances of survival. Green roofs also act as superb active insulation, helping keep a building cool in summer, yet warmer in winter. This again helps not only save money, but also resources in the production of power. Green roofs also improve the aesthetics of a building, especially when the plants flower, with small blooms of yellow, pink, white and red flowers appearing at different times of the year. These aesthetic qualities also help dramatically when applying for planning permission for new buildings as, not only does the green roof actively remove pollutants from the new site, it may be used to disguise or even hide the new development.

What is a green roof?

Green roofs are basically roofs where, instead of having tiling or felt as the outside layer, a mat consisting of either sedum or other succulents, grasses or moss is the visible layer. Underneath the living mat, a drainage system is installed, bespoke to the roof as different roofs and situations require different solutions. There are many different advantages to green roofs from excellent insulation capabilities, aiding in planning applications to simply looking good. There are two main types of green roofs – extensive and intensive.

What's the difference between an extensive and intensive green roof?

More often than not, the roof's structure, for example the pitch, and load bearing capabilities determine which type of green roof is required.

Extensive – Extensive roofs are generally used on larger roofs where weight can be an issue and also the amount of maintenance is a consideration. There are fewer drainage layers and, as the construction is simplified, the cost is therefore lowered. Extensive roofs are also often used where the ecological benefits are paramount as they are more cost effective in the long run.

Intensive – Intensive roofs are often used in the domestic market, where an aesthetic solution is perhaps more important than an economical one. The drainage systems in place may be more complex and also the living mat itself may hold more plants and more varieties. An intensive green roof may well also incorporate trees, shrubs, as well as pathways and patios for enjoyment by people, these types of green roofs may also be referred to as roof gardens.