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58 EXTERNAL ENVELOPE


Over 13 Schöck product variants at Hendon Waterside


envelope, has become increasingly important in the drive for sustainability and energy efficiency. And the prevention of thermal bridging is critical with structural attachments such as balconies. Ineffectual insulation at the connection points means local heat loss, with more energy being required to maintain the internal temperature of the building. This is an important aspect of thermal bridging, but there are other issues. Low internal surface temperatures in the area of the thermal bridge can cause condensation. Leading not only to structural integrity problems with absorbent materials such as insulation products or plasterboard, but the potentially serious occurrence of mould growth. So for any large-scale project involving a variety of different balcony types, the prevention of thermal bridging is particularly important.


M


Challenging variety of balcony types One current project with a challenging variety of balconies is Hendon Waterside in North West London, a mixed tenure development. Situated alongside the Brent Reservoir (known locally as the Welsh Harp after a public house which used to stand nearby), the scheme involves the regeneration of a 1960s housing estate being built in six phases and scheduled for completion in 2027. The masterplan will deliver around 2100 new homes consisting of social, affordable and private housing. These are being constructed


inimising energy use in buildings, by improving thermal performance of the building


The main Tower from across the Welsh Harp


in twenty-three blocks, varying in height from three to twenty-three storeys – along with an imposing tower building of twenty-eight storeys. Also planned are new public parks, a primary school, community centre and commercial space.


Hundreds of Isokorb variants in the range The many balconies involved vary in their design demands and to ensure that thermal bridging is minimised, Schöck has supplied over thirteen different product variants. As the leading international supplier of structural thermal breaks, Schöck has a solution to practically every connectivity detail with the hundreds of variants available in its Isokorb range. The products at Hendon are for concrete-to-concrete and provide optimum solutions by using varying tension bar arrangements. For example, one type provides cantilever balcony connections and


Inside the complex


One of the Isokorb types used at Hendon Waterside


transfers both negative moments and positive shear forces. Another is a load-bearing thermal break element for transferring shear forces on supported balconies, recessed balconies and for occasional peak shear forces. Others transfer positive shear forces with point support, or transfer positive shear forces with point support and zero stress connection.


Totally verifiable performance In addition to concrete-to-concrete, the comprehensive Isokorb range also offers solutions for concrete-to-steel and steel- to-steel – and even a maintenance free alternative to wrapped parapets. A requirement that the temperature factor used to indicate condensation risk (fRSI) must be greater than, or equal to, 0.75 for residential buildings, is easily met by incorporating the Isokorb. Products meet full compliance with the relevant UK building regulations, have NHBC approval and offer LABC Registration. There is also the security of independent BBA Certification.


01865 290 890 www.schoeck.co.uk


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ADF AUGUST 2019


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