I built this one last week on a garden office in Dulwich. I don’t do so many sedum roofs but this did come up looking really nice and is instantly green.
The roof build up was using the Optigreen lightweight roof system. A protection fleece over the waterproofing, drainage layer, lightweight substrate and pregrown sedum on top. This was ideal for this garden office and really helped it blend in to the trees and plants at the bottom of the garden. The roof will drain into a gutter when complete (not that there will be a lot of runoff). I used aluminium edge trim all the way round to give it a nice defined edge.
The substrate was incredibly dry when it arrived, I initially thought it was just sand! This made it really easy to get up on to the roof, the bags weighed even less than usual. Luckily it has had a good soaking with the rain since to get it nice and wet.
Getting the sedum up on the roof was a little trickier, we left it out overnight and the client enthuisiastically watered it making it very heavy. After struggling with a couple of rolls I realised it was better to cut the mats in half to make them easier to handle.
Once it was all up it looked really good. I spoke to the client again the week after to check on it and he said ‘It looks absolutely stunning. The wife and my nearest neighbours really like it – so a big thankyou. I have been diligently watering it and it is looking good. Many thanks‘ very pleased with the feedback.