The flat roof design included a built-up waterproofing system with tapered insulation, utilising the high-performance StressPly Flex bituminous membrane system.
In conjunction with LST Projects, Garland UK approved contractor Warner Contracting began the works with a new profiled metal deck with 18mm WBP plywood installed alongside a new composite deck. A combination of EPS and PIR was installed for the new roof, varying thicknesses from 360mm-100mm to provide a gradient and tapered effect across the 1000 sqm roof areas to direct rainwater to upgraded outlets, guttering and downpipes. The upgraded insulation achieved a 0.16W/m2K U-Value rating.
The roof construction comprised a new metal and timber framework, with a self-adhesive base sheet used for the parapet upstands. A self-adhesive vapour control layer was installed on the main roof areas to mitigate the risk of hot works on site with flammable materials, particularly for the initial waterproofing phase. The new parapet wall height negates the need for any additional handrails to conform to regulations.
Once the warm roof system was in place, the existing solar PV array was reinstalled with a ballasted frame to ensure the waterproofing integrity was not compromised with penetrations to the roof system. Ballasted frames are load-supported and can be used with existing PV panels, creating flexibility for new and pre-owned systems.
The plant room comprised the R-MER CLAD system, a lightweight and hardy trapezoidal metal roof profile, including new insulation to achieve a 0.16 W/m2K U-Value.
Access walkways were laid in an alternate colour cap sheet for future maintenance. In addition, new access hatches and ladder systems, lightning conductors, cable duct flashing, and roof box housing were installed to finish the project.
