Making our own small green roof

In 2016, we redesigned the back of our Victorian house in Sheffield which included the renovation of an existing uninsulated balcony roof over an off-shot cloakroom and utility space.  We had decided it could be a good location for a small green roof as it is overlooked by bedroom windows and is relatively easily accessible from a level area in the garden.  The roof faces South West and is 2600mm long x 900mm wide (area 2.35m2).  Our idea was to create a low maintenance green roof, attracting insects and birds, and to test different types of planting.  We spent several months reading around the subject, using text books, magazines and specialist internet sites, plus our knowledge of designing larger green roofs. Before we commenced the green roof, our builder removed the railings and tarmac surface and the in-situ concrete slab was fully refurbished to include insulation (depth to comply with Building Regulations) and a fully waterproof roofing layer, in this case a ‘Plant E’ capping sheet from Bauder Roofing.  Our green roof is not fixed to or through the waterproofing layer; this is to maintain the integrity of the roof construction.  We set out intending to source all our materials…

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