In this example i have used a pent shed roof rather than an apex which is easier to demonstrate on. Build the frame so it provides a 3cm lip around the roof felt for the substrate and sedum blanket to be placed into.
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For a first green shed roof i would recommend that you start off relatively small.
How to build a green roof on a shed. This improves the drainage of the green roof which helps reduce soil erosion and aerate plants. For this shed i used 3×2 softwood timbers at 600mm 2 ctrs which spanned 1 2m 4 with an 18mm 3 4 plywood deck. You will need to build a tanalised wooden frame to your existing shed roof.
Partly to minimise the structural requirement and also so you can find out what works for you. How to plant a green roof on your shed 2 may 2019 written by benedict vanheems with so much recent talk of biodiversity loss and climate change green roofs have forged a reputation as one of many strikingly simple ways to push back. Step 5 cut a piece of weed matting large enough to cover the roof and the inside of the frame.
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