34 Case studies Transforming Construction More Homes Through Manufacture A Housing Forum Working Group Report Case study 6 The Greenhauses, West London Contributed by Kingspan Insulation technical@kingspaninsulation. co.uk Name of project: The Greenhauses, Brook Green Town or city: London Brief description: Thirty new homes, including eight for outright private sale, 13 for shared ownership and nine for affordable rent. The site comprises a row of three-storey terraces (Block A), two five-storey apartment buildings (Blocks B & C) and a further four mews houses with roof terraces (Block D). Both Blocks A and B have now been fully Passivhaus certified. Total cost: not supplied Average cost per unit: N/A Principal partners: Octavia Housing (client), Cartwright Pickard (architects), Durkan (contractor) and Kingspan Timber Solutions Briefly describe the construction method On Block A, a breather membrane was stapled to the outer face of the Kingspan TEK Building System (SIPs), followed by 90 mm thick Kingspan Kooltherm K12 Framing Board. A 50mm cavity was then left between the build-up and the 102.5mm brickwork facing. Internally an airtight membrane was taped to the Kingspan TEK Building System’s face, followed with a 25mm service zone and two 15mm layers of plasterboard lining. The Kingspan TEK Cladding Panels (SIPs) installed on Block B were fixed to the concrete floor slab using angled cleats. The buildup mirrored those in Block A with the airtight membrane sealed to the concrete frame and soffits with airtight tape. Why was this method chosen? Brick was chosen as the primary façade material for the buildings. Given the tight, urban nature of the site, minimising the thickness of the remaining wall build-ups, whilst still attaining the required level of thermal performance, was a key objective. SIPs ensure a predictable installation with minimal on-site waste. The proprietary jointing system featured on both Kingspan TEK products, in combination with the additional airtightness detailing on the project, ensured that air loss from the blocks is below the 0.6 air changes per hour @ 50 Pa. On average, these homes are anticipated to make significant savings on fuel bills (up to 90 percent in the case of the certified units).
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