2012 Olympic Stadium, London, UK
Eliminator waterproofing system wins gold at the 2012 Summer Olympics
The Games presented the Olympic Delivery Authority (ODA) with the opportunity to set new standards in construction and promote the use of modern, effective and sustainable technologies.
One structure on which the ODA took this opportunity was on the 2012 Olympic Stadium itself. With a capacity of 80,000 it is the third largest stadium in England and being the venue for the athletics as well as the opening and closing ceremonies meant the eyes of the world would be on this structure.
The ODA recognised this and set about procuring market leading systems for the construction and protection of what would become the centre piece of the Olympic Park. A critical element was the management of water and the prevention of corrosion to the structure.
Olympic Delivery Authority
Sir Robert Mcalpine
Stirling Lloyd Construction Ltd
- 2012 Olympic Stadium
Selection & application Part 1.
Therefore the selection of both a proven, effective waterproofing system and a fully compatible and just as effective expansion joint system was paramount.
The ODA’s search and selection process led them to select Stirling Lloyd’s Eliminator waterproofing system and the companies Sentinel Saba Expansion Joint system. The Eliminator system has an unparalleled track record of success on major structures around the world and could offer the ODA fast application and cure. Its toughness and tolerance of difficult site conditions meant the exposed membrane, once applied, could be trafficked by following trades. The strong bond it achieves to itself, irrespective of the length of time between applications enables the system to be applied in sections at various locations on a project with no detriment to the bond achieved or in-situ performance. These features enable programme progression and flexibility within that programme.
The Client and Main Contractor were equally impressed with the Sentinel Saba system. Designed specifically to provide waterproofing continuity across expansion gaps in complex building projects, the system consists of a two component, liquid applied, solvent free, reinforced resin membrane applied in-situ to form a highly flexible expansion joint. Installed to almost any ‘as built’ shape, watertight changes in direction and intersections in all dimensions are possible. These features were fundamental in its selection as the joint system had to cope with the many curves, bends and changes in direction within the structure and played a major part in the successful delivery of the project. The Eliminator system was used to waterproof 32,500m² of the podium roof that formed the second tier of the stadium. Spectators entered the stadium at this level and with a demountable lightweight steel and pre-cast concrete upper tier being built up from it meant that effective protection to this area was paramount.
Selection & Application Part 2.
The external podium roof covered some 14,000m² of the area waterproofed and formed the Stadium’s concourse. In this location a slip resistant finish was required. To achieve this Stirling Lloyd’s heat activated bond coat, SA1030 was applied to the membrane followed by an innovative recycled anti-slip surfacing system. As the surfacing was applied it activated the SA1030 and as it cooled it formed a tenacious bond to both the membrane and the surfacing, helping ensure a long service life.
The internal podium roof was to house the stadiums services and the waterproofing was overlaid with concrete slabs.
Such was the success of the waterproofing of the podium roof that the Eliminator system was selected for tanking the Stadium’s plant room. Housing escalator pits, generators and the electrical switchgear fundamental to the operation of the stadium, it was critical that this area was effectively waterproofed. Once applied the Eliminator membrane was electrically integrity tested to confirm that a defect-free fully waterproof finish had been achieved. The Sentinel Saba Expansion Joint radiated out across both the internal and external podium roof, following the contours of the substrate which included vertical and numerous changes in directions.
On site, to ensure the benefits of using these two systems were fully realised a collaborative working approach was undertaken between the manufacturer, the specialist sub-contractor Stirling Lloyd Con- struction and the Main Contractor, Sir Robert McAlpine. This led to ‘best in class’ partnering on this major and technically demanding project. Working together as integrated delivery partners, the planning and co-ordination of works around other construction activity, which the systems features allow, was key to the project’s success. Work was completed ahead of key delivery dates and no delays occurred during the entire 18 months Stirling Lloyd Construction was on site.
The structural roof waterproofing package was completed ahead of programme, to budget and to the highest technical standards on this world class project. Together with our waterproofing and surfacing work on the games International Broadcasting Centre’s Car Park and the Aquatic Centre’s roof, Stirling Lloyd are pleased to say they played their part in the success of the 2012 London Olympic Games, while the longevity that our waterproofing systems provide will help ensure that these important structures also fulfil their legacy function for those who wish to use these facilities even when the games are a distant memory.
The London 2012 Summer Olympics has been hailed as one of the most successful games of the modern era. This accolade has been directed not only at the sporting endeavours witnessed but also to the infrastructure that played a vital roll on the games success. Eliminator’s durability and long service life along with Sentinel’s Saba expansion joint system will ensure that the splendour of the Olympic Stadium will remind well into the future.