At the £30 million redevelopment of Farnham Road Hospital in Guildford, Surrey, BriggsAmasco has installed a complex waterproofing system that will provide outstanding weather tightness for a new extension set to house four wards and 60 ensuite bedrooms.

Originally built as the Royal Surrey County Hospital, with advice from Florence Nightingale, Farnham Road Hospital first opened in 1866. The site’s redevelopment by main contractor Laing O’Rourke includes retention of a Grade II-listed main building and the creation of a new extension.

As part of the 81-week build programme, BriggsAmasco was appointed to complete a series of waterproofing applications across the extension’s main roof, perimeter upstands, lift overruns and clerestory roof areas. The company installed a roof system comprising IKO PermaTEC Hot Melt monolithic membrane, Knauf insulation and IKO Goldseal bituminous membrane to provide a highly aesthetic and watertight finish.

For the new building’s main roof, IKO PermaTEC hot melt was specified to provide the perfect combination of performance, cost and ease of application. The installation included 180mm Knauf insulation and was finished with slab walkways and 20-40mm of stone ballast.

At the perimeter upstands to the main roof, BriggsAmasco used a torch-on underlay and finished with IKO Goldseal cap sheet in black. Installation of anti-climb downpipes and hoppers were also included in BriggsAmasco’s scope of works.

To complete the specification, IKO self-adhesive underlay and vapour barrier, 120mm IKO insulation and Goldseal mineral were installed on the lift overruns and clerestory roof areas. A high performance elastomeric built up roofing system, IKO Goldseal combines greatly improved dimensional stability, low temperature flexibility and fatigue resistance.

Scheduled to be completed in autumn 2015, BriggsAmasco has provided a high performance and durable waterproofing system to ensure the project remains on track. Utilising the company’s exceptional workmanship and attention to detail, along with a market proven product, the new Farnham Road Hospital building is set to benefit from a roofing system that will stand the test of time.




Hot Melt