In 2017 a bespoke shed to store bikes and other equipment with an extensive sedum roof was build in a domestic garden in Mytholmroyd
The shed is made from regular tanalised timber, and is a custom design, with a 2″ x 4″ timber frame to support the extra weight of the roof and the double doors. The roof consists of an EDPM liner membrane, sealed at the edges with flashing tape. A drainage board and a layer of filtering fleece sits over this, then a layer of lightweight substrate (roughly 80% sand and perlite to 20% compost), then a sedum mat. There’s a small drain at the back corner of the roof to prevent it flooding, and everything is held in place with edging boards.
Main benefit of this roof is to soak up the rainfall. Additional benefit of this roof is it adds character to an outbuilding that would otherwise be fairly dull but functional. It helps the shed blend in to our relatively small garden, and it changes appearance in a really interesting way, depending on which of the sedum species is currently dominant. It also flowers in summer, which was a really nice surprise, and the bees love it!
Ideally any water run-off would be collected, but there’s no space for a waterbutt.
Costs: Shed materials – £800 Green roof – £50
Post Submitted by: Antony de Heveningham