![]() ![]() You may have wanted to build a green shed roof for a while but been put off by the cost or it looking too complicated. If your shed or garage roof is not very easily accessible, you could even consider creating a kitchen garden by growing shallow-rooted, hardy herbs such as Rosemary, Chive, or Thyme.How to create a simple low-cost green shed roof Native wildflowers are another great choice for roof gardens, as they require almost no maintenance, will attract plenty of local wildlife and will provide a stunning, colourful display in the summer months. These hardy succulents provide excellent coverage with minimal food, water, and sunlight requirements, whilst providing pretty blooms. Sedum blankets are by far the most commonly used vegetation in roof gardens. Try to mix your species, as this improves biodiversity, adds interest, and prevents disease or nutrient deficiency. Low maintenance and shallow-rooted plants are the keys to success here. Occasionally, during droughts, plants may require extra watering. The idea is to create a garden that only needs tending once or twice a year, to weed, feed, replenish any dead areas, and check on the drainage system. Finally, you can install your vegetation or sow seeds over the substrate layer. This should be between 50 and 100 mm deep. Next, you will need a layer of lightweight, nutrient-rich, free-draining substrate as the growing medium for your plants. Drainage mats are readily available to purchase in a variety of size specifications and usually feature capillaries or perforations which allow water to flow freely. It is crucial to install a drainage layer to prevent your roof from becoming waterlogged. A polyurethane sheet or weed-proof fabric should do the trick. Next, you will need a root barrier to protect the structure from root damage. This could be an existing layer of bitumen or similar, or you may need to install something more hardwearing. Firstly, they require a waterproof layer or membrane to protect the structure beneath. LayersĮxtensive green roofs need to be constructed in layers. Your roof will need to receive both adequate sunlight and rainfall for plants to thrive, and you will need to access your garden once or twice a year for essential maintenance, so ensure you have a safe way of getting up on top of your shed or garage. If your chosen roof is slightly sloped, you may need to build a supporting frame to prevent the garden from slipping down the roof, particularly after heavy rainfall. Of course, flat roofs are preferable, but any slope of fewer than 30 degrees is suitable for a green roof. ![]() You will need to check out the structural integrity of your shed or garage first, to ensure it can support the extra weight of the garden. How to fit a Green Roof? Structural Integrity and Specifications They are low maintenance, uncomplicated, and lightweight by design. Extensive green roofs, however, are much better suited to your garden shed or garage. Intensive roof gardens tend to be created on a large, complex, and commercial scale (think rooftop gardens perched above city skyscrapers). As well as providing unconventional and unexpected slivers of beauty amongst mundane architecture, they help to improve biodiversity in urban areas, attract local wildlife, offset carbon emissions, and even provide insulation and flood protection for nearby structures. Green roofs are increasingly popular features atop houses, sheds, and garages across Britain. Creating a Green Roof on Shed or Garage What is a Green Roof?
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