37 Case study 9 Kidwell’s Estate, Maidenhead Contributed by Paul Inch Innovaré Systems paul.inch@innovaresystems.co.uk David Fish Wates Living Space david.fish@wates.co.uk Name of project: Kidwell’s Estate Town or city: Maidenhead Brief description: The mixed tenure scheme consists of apartment blocks providing a mix of one, two, three and four bed homes and a new communal space. Works consisted of the demolition of existing residential units followed by the construction of seven blocks across 3-5 storey height. In total, 204 units were constructed over four phases. Total cost: £26 million Average cost per unit: Not supplied Principal partners: Wates Living Space(contractor), Innovaré Systems (designer), Innovaré Systems (manufacturer),One Housing Group (client),Reddington(frame and groundworks), Clearwall (drylining) and Entric(electrical),Peter Taylor Architects (architect) Ramboll ( structural engineer) Length of time to build (from start on site): Works for phase one commenced in September 2010, with completion scheduled for June 2015. 57 months Estimated length of time to build if using traditional methods (from start on site ): 6 months longer, 63 months in total Briefly describe the construction method SIP infill to concrete frame. Innovaré provided 162 mm i-SIP panels which could achieve a low 0.19/W/m²K u-value. The sub-structure is a mass fill foundation. Why was this method chosen? i-SIP infill consists of structural insulated panels manufactured offsite and transported to the building site. As the panels are prefabricated, infill does not have to be assembled by hand. Kidwells Estate has constrained access in a number of areas due to low rise buildings in close proximity to each other. This live site also had a number of noise restrictions due to residents remaining on the estate while works were taking place. A high performance infill solution was needed to combat the increasing costs of energy faced by residents. How did costs compare with traditional methods? The Wates project team concluded that the switch to the i-SIP system made a 10 percent overall programme gain and a 25 percent saving of the cost of their mechanical and electrical provision. Significant financial benefits were delivered, as Innovaré did not require scaffolding during their works and also replaced edge protection as they completed each floor by virtue of including a timber barrier to all apertures. Would you use this method again? Yes. What are your reasons? It potentially reduces scaffolding costs. Scaffold periods are reduced by using SIPs. The infill is quick to install and is high performing thermally. It integrates well with pre and follow on trades, removes the risk and hassle from the construction site.
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