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Gunwharf Quays in Portsmouth is a 33-acre waterfront development, which opened in 2001. It is one of the UK’s best performing retail outlets, attracting more than six million visitors a year. Plans for a £45 million revamp were announced in 2023 and work to upgrade this shopping and leisure haven is ongoing.
Gunwharf Quays in Portsmouth is a 33-acre waterfront development, which opened in 2001. It is one of the UK’s best performing retail outlets, attracting more than six million visitors a year. Plans for a £45 million revamp were announced in 2023 and work to upgrade this shopping and leisure haven is ongoing. Earlier this year, the owners installed over 1200 solar panels, which generate more than 500,000 kWh annually and reduce carbon emissions by 115 tonnes - the equivalent of planting 5,400 trees. A series of single ply roofs and an asphalt roof were destined for an overhaul as part of the renovation. With shoppers and retail workers occupying the buildings throughout the works, the roof refurbishment needed to be carried out safely and without disturbance to people.
Three single ply roofs and an asphalt roof were showing signs of wear and tear and needed to be revived with an effective waterproofing solution. The mall is a popular destination for many visitors and therefore the buildings had to remain fully operational while the works took place.
With visitors and staff occupying over 90 stores and 30 restaurants, bars and cafes, it was crucial to use a cold-applied, low-odour waterproofing solution to eradicate any risks associated with hot works or harmful materials.
The asphalt roof was stripped of chippings and prepared and primed before being treated with the Centaur Standard 25 system, which incorporated a Centech SA Carrier/VCL carrier membrane and a waterproofing membrane. Two coats of the Centaur waterproofing system, which is fully reinforced with Centech GFM for durability, were then roller applied to provide a durable and watertight finish.
Core samples were taken on the three single ply roofs and the build-up was found to be dry, indicating that overcoating them was viable. The existing substrates were then prepared and primed ready for the Centaur Standard 25 system, which is designed to provide long-term, seamless waterproofing.
The Centaur system lent itself well to the complex detailing on the roofs, which included various plant and equipment. Free-standing equipment was temporarily relocated to allow the seamless application of the Centaur Standard system.
Non-flammable, ultra low odour and free of any harmful materials, Centech PU is one of the safest liquid roofing solutions on the market. It is cold-applied and cures quickly, making it easy to work with.
The Centaur system does not require hot works on the roof, which are a fire risk. The single pack solution is quick and simple to apply and is fast-curing – even in seaside locations, such as this one.
The low odour and safe formulation ensured that no one was exposed to any unpleasant odours or the risk of sensitisation by inhalation during application.
Made with responsibly-sourced raw materials and designed to be zero-waste and straightforward to overcoat, the Centaur system also helps to support the development’s sustainability targets.
A comprehensive Centaur 25-year single point guarantee was provided on completion of the project.
Centaur Technologies Limited is a British owned and managed specialist roofing company, focused on the development and supply of leading edge liquid roofing systems.
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