Riefa® Boards are a light weight, organic, economical alternative to a traditional green roof. Riefa® Boards can be fitted directly onto a root resistant, waterproof membrane, then covered in a layer of living vegetation. Riefa® Board can be used in conjunction with many types of vegetation, including sedum, wildflower, chamomile & herbs. A living roof covering has many benefits including energy conservation, extending the life of a roof. http://www.riefagreenroof.co.uk
Concept: putting a vine, eg passion fruit, choko, etc over the garden shed to cool it in summer and make use of the vertical space for food production, plus it looks more appealing. Could even grow different vines at same time to add greater visual and food interest. Plus, Great book, apparently ;-). All you need to know about how to build your own little green roof on a shed or outbuilding.