en.Wedoany.com Reported - During recent structural renovations at the Gunwharf Quays outlet shopping centre in Portsmouth, UK, main contractor Conamar partnered with specialist contractor QST Construction Services to introduce a deck waterproofing system from Newton Waterproofing, resolving the risk of water ingress into the underground structure caused by the ageing and failure of the original waterproofing layer.
Since opening in February 2001, the shopping centre has been a well-known retail destination on the south coast, featuring over 90 brands and situated adjacent to Portsmouth Harbour. The renovation involved a 240-square-metre concrete deck area located above an underground car park. Inspections revealed that the existing deck waterproofing system had deteriorated, potentially allowing water to seep into vehicle areas and damage the substructure. After Conamar removed the existing flooring to expose the failed waterproofing layer, they collaborated with QST to seek technical support from Newton Waterproofing.
The QST team, together with Newton Waterproofing technical specialists, developed a solution, specifying a complete beam and block deck waterproofing system. The installation team first removed all failed materials and eliminated surface contaminants through mechanical preparation to ensure the substrate was suitable for the new waterproofing system. On this prepared base, the contractor installed Newton Waterproofing's BBA (British Board of Agrément) certified deck waterproofing system, PolyMaxx HA. This is a seamless, hand-applied, fibre-reinforced membrane system specifically designed for areas such as decks, flat roofs, balconies, and walkways. Its curing technology typically allows each coat to cure within 30 minutes, enabling the entire system to be installed in a single day, forming a flexible, durable membrane that effectively prevents water penetration.
During the installation, the QST team faced challenges including a lack of weather protection over the work area, winter installation conditions, and persistent water ingress at the perimeter edges, requiring additional detailing work. Despite the impact of winter weather, the installation progress remained rapid and smooth. Through thorough preparation and precise installation, the team effectively waterproofed all concrete deck areas using the PolyMaxx HA system. The result was verified by a flood test involving an 80mm depth of water held for 36 hours, with no leaks detected.
Bradley Hartley, Project Manager at QST Construction Services, stated that the PolyMaxx HA system is easy to use, allowing for efficient and consistent application, and that work progressed smoothly to a high standard when conditions permitted.
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