Sedum Roll-Out Green Roof System on Garden Outhouse, Ramsbury, Wiltshire

Installed in April 2025, this 180m² green roof project in Ramsbury, Wiltshire, features Wallbarn’s roll-out sedum system installed on a newly constructed residential garden outhouse. The client was looking for a natural, biodiverse finish that would blend effortlessly into the rural setting and provide long-term ecological value.

The full build-up comprised a protection fleece laid over the waterproofing membrane, followed by a drainage/reservoir board to manage water retention and discharge. A geotextile filter layer was then installed to prevent fine particles from migrating, topped with a specialist extensive substrate to support plant growth. Finally, Wallbarn’s pre-cultivated sedum blanket was rolled out as the top layer, offering instant green coverage and aesthetic impact.

Lightweight and easy to install, the system was ideally suited to the timber-framed structure. In addition to visual appeal, it now supports pollinators and wildlife, delivers rainwater attenuation, and contributes to the building’s thermal performance—all with minimal ongoing maintenance.