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CITYROOFS - Rooftop Parking - Fast

A fresh approach to rooftop parking has been taken at the new Westfield Stratford City - destined to be the largest urban shopping centre in Europe and the gateway to London’s Olympic Park - with the innovative Pardak® tensioned-slab paving system.

Around 15,000m2 of Pardak has been installed over an inverted, well-insulated roof in open, upper levels directly over retail areas in the new centre. Using Pardak enabled the reinforced concrete slab with metal decking soffit to be waterproofed far more quickly than a conventional insulated slab, allowing work both above and below to proceed sooner. Then, rigid insulation slabs were laid over the deck, before installation of the Pardak system by Zoontjens - trading as CityRoofs in the UK – working for the leading waterproofing specialist BriggsAmasco.

Pardak uses dry, prefabricated construction techniques for fast, safe installation, unaffected by most weather conditions. It consists of high quality, vacuum-formed concrete slabs supported on pressure distributor pads with adjustable tensioning elements. The pressure distributor pads sit directly on the insulation - so eliminating any cold bridging – and the flexibility of the system compensates for uneven surfaces. The concrete slabs at Westfield Stratford were installed by Tolly Paving using a vacuum-lift machine. With extensive machine-lay experience and long-standing relationship with Zoontjens, Tolly Paving achieved some 1,500m2 per week despite the constrained building environment.

Following installation, bolts in the tensioning element are simply adjusted to close the slabs up, creating an integrated, homogeneous surface. Here, vertical, as well as horizontal forces exerted by vehicles braking, decelerating and turning, are distributed between several slabs and differential movements accommodated. Pre-formed slots allow water to move rapidly off the surface, without the need for falls, into the void below, where it can be attenuated before discharge as part of a SUDS strategy. This void also accommodates service cables.

Pardak protects the waterproofing membrane from UV, structural and other damage, while keeping it accessible, as individual slabs can be removed easily. In fact, the system can be rapidly dismantled if necessary. Pardak is also suitable for other roof build-ups, including warm and un-insulated, as well as inverted roofs. It has also been used to pave almost the entire 36,000m2 rooftop car parking on ‘The Wall’, the longest building in the Netherlands.

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News Categories:
Elevated parking Living roofs Living walls Rooftop parking

Arundel Jones Associates Ltd
Hill Farm Business Park, Linton Hill, Maidstone, Kent ME17 4AL
Tel : 01622 745333

news@buildingdesign.co.uk


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