Rushers Ghyll

Synopsis

Rushers Ghyll is a new‑build residential dwelling with a roofing solution designed to integrate sustainability, long‑term durability and efficient water management. The project combined an extensive green roof with a high‑performance felt waterproofing system accommodating solar PV, requiring a carefully coordinated specification capable of supporting varied build‑ups, drainage demands and thermal performance objectives. A full cut‑to‑falls insulation design was developed to manage rainwater efficiently, ensuring consistency of performance while supporting the environmental aims of the project.

Bauder building board

The specification

The project was specified with the BauderFLEX waterproofing system to provide a durable solution suitable for both green roof areas and a separate roof section incorporating solar PV. The system was selected to deliver consistent performance across multiple roof zones with differing functional requirements.

The roof build‑up included a BauderTEC KSD FBS air and vapour control layer, followed by BauderPIR FA G16 Ttapered insulation to provide thermal performance and form the required drainage falls. BauderTEC Sprint DUO was used as the underlayer, supporting efficient installation within the overall system. Waterproofing was completed with the BauderFLEX K4E capping sheet, providing a robust, mineral‑finished waterproofing layer compatible with the specified roof build‑ups.

Project challenges

Achieving the required roof falls and directing rainwater accurately toward bespoke drainage points demanded careful coordination due to the configuration of the roof areas. This required close attention during installation to ensure the designed drainage strategy was followed precisely across the project.

The green roof build up also required careful management, with particular attention given to the sequencing of the waterproofing, drainage layers and substrate. Ensuring each element was installed correctly was essential to support long term performance and ongoing maintenance of the green roof areas.

Access constraints presented a logistical challenge, as the property was served by a narrow lane that could not accommodate HGV deliveries. To address this, materials were delivered to an off site location before being transported to site using smaller vehicles. Weather conditions also affected progress, with a drop in temperature requiring sedum mat cutting and delivery to be postponed to protect product quality and avoid compromising the installation.

The result

The completed roofing installation delivers a well‑coordinated solution that successfully integrates green roof coverage with a robust felt waterproofing system and solar PV. Following final inspection, the works were confirmed as fully compliant with Bauder’s technical standards, allowing a comprehensive Bauder guarantee to be issued and providing long‑term assurance of performance and build quality.

The project’s approach to sustainable roof design and careful detailing was further recognised through its shortlisting as a finalist in the NFRC Awards green roofing category. This acknowledgement reflects the effectiveness of the specified system, the quality of installation, and the long‑term benefits in terms of durability, environmental performance and future resilience.