![]() They need much more attention and maintenance – much like a normal landscaped garden.įast drainage is key for intensive systems as water will be retained in the soil, and any excess that isn’t drained away can saturate the roots of your vegetation. Intensive roofs require a much deeper substrate to be built up - this means additional weight that will need to be supported as well as irrigation requirements. They are more common in larger commercial projects including parks and gardens where recreational use is expected. They require a layer of growing medium / soil to support this much thicker vegetation layer. You may find that they are referred to as roof gardens. Intensive green roofs are designed to support much larger items like bushes and small trees as well as a wider variety of plants. If you are using sedum blankets then you will require some additional growing medium but it can be fairly shallow. Sedum green roofs are the most common type due to the hardiness and low maintenance requirements of the plant. Extensive green roofs normally have an attractive low layer of vegetation, around 80 - 100mm high such as grass, moss, sedum or small flowers. They are suitable for both existing and new build roof decks. Let’s look at the differences between them: Extensive green roofsĮxtensive green roofs are a popular option for homeowners as they are lightweight and require very little maintenance with no need for additional watering unless there is a prolonged drought. It’s also important to mention green roof tray systems (an instant extensive green roof option). When it comes to your options, there are three main types of green roof to consider – extensive, intensive and semi-intensive. Green roofs are sometimes referred to as living roofs, grass roofs or sedum roofs, but these all relate to the same thing. In this guide we take you through the main considerations around choosing a green roof system, how to design it to meet your needs and then we cover green roof construction. They also have a positive environmental impact, attracting wildlife such as birds and insects, and improving air quality in particular in urban areas. Green roofs extend the life and improve the performance of the roof, cutting energy costs. They also deliver a whole range of benefits. A green roof is a great way to create an attractive design feature on an outbuilding like a shed or garage or transform your home.
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