Sedum green roof on an extension
A sedum roof can make a flat-roof extension more attractive, cooler and better for rainwater buffering.
Green roofs are increasingly popular on modern rear extensions.
They add weight and require correct roof build-up, so they should be included from the start.
Benefits
Sedum helps buffer rainwater, supports biodiversity and can reduce roof temperature in summer.
It also improves the view from upper floors.
Structural checks
A green roof adds permanent load, especially when wet.
The roof structure and drainage must be designed for that load.
Maintenance
Sedum is low-maintenance, not no-maintenance.
Periodic checks of outlets, weeds and edge zones keep the roof healthy.
Summary
A green roof is a good addition when structure, drainage and maintenance are designed properly.
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