A deprived building and local community receive something to go ‘ping-pong’ over

    Granted a Grade II* Listing in 1954, Christchurch, 35 Cosway Street is a distinctive deconsecrated church in the Lisson Grove Conservation Area. With so much decorative detailing inside and out, it has made the change of use and renovations quite challenging.

    Since the 1980s, the former church has been used as B1 grade offices. It was home to Braemar Shipbrokers during a number of years until early 2017, when it sold the leasehold to their corporate headquarters to Greenhouse Sports Ltd.

    Greenhouse Sports was set up in 2002 as a sports coaching charity and initially provided young people something positive to do in the school holidays. The pilot, which was supported by the Metropolitan Police, was such a success that demand grew and Greenhouse merged with another charity; Table Tennis for Kids (TTK). Since then, the charity has worked predominantly in schools, delivering full-time sports coaching and mentoring programmes that has aided over 40,000 young people. Recently, they acquired 35 Cosway Street, located in one of the most rundown wards in London, and have refurbished the building into a state of the art sport centre that enables them to spread their sport for development model into the community.

    A radical and sensitive transformation was essential to turn the church into a sports centre, to deliver first-rate facilities for the coaches to supply high-quality sports programmes, for the local community and beyond. Latitude Architects was engaged to work on the plans for the renovation, which commenced in consultation with Historic England. Planning permission sought approval for the installation of a lift, new internal lighting, the addition of balustrades to the gallery, a new sports floor and more.

    Located in the midst of local shops, residential areas and community buildings including a school; sound insulation was essential to stop noise escaping and disturbing local residents. The beautiful original single pane stain glass windows could not be altered, so did little to prevent the outbreak of noise. Therefore, Latitude architects specified the use of secondary glazing for sound insulation. It also enhanced the thermal properties of the building and provided guarding in certain areas.

    The installation of secondary glazing, which is fitted to the room side of a building, is a great solution for combating outside noise, and a reduction of 45dB is possible when there is a 100mm-200mm cavity between the primary and secondary windows. Furthermore, secondary glazing traps an insulating layer of air, which can reduce heat loss by up to 50%. With the inclusion of low emissivity glass, U-values of around 1.8 can be achieved. The use of high performance twin seals help to practically eradicate draughts.

    Cosmur Construction (London) Ltd, specialise in sensitive renovations of Listed buildings and were appointed as Main Contractor. They approached Selectaglaze to discuss the treatment and scheduling of secondary glazing works to the windows. Cosmur found they had to extensively repair the 150 year old roof. When inspecting the ceiling it was found to flex when touched, yet initially seemed fit for purpose. Specialist tradesmen had to be enlisted with the required skills to re-plaster like for like with lime as first done in 1826 – they even found signatures of the original plasterers in the roof void.

    Although the secondary glazing wasn’t as problematic as other areas of the renovation, it still posed some interesting challenges. The windows were huge and had large sweeping curved heads at high level. Therefore to enable exact measurements and a snug fit, a laser measurer was used to plot the arches to facilitate the manufacture of the units.

    The newly created mezzanine level cut the full height windows in 2 which left a void in all the reveals. To combat this, the 1st floor glazing also acted as a guard to the void, which included 12mm toughened glass.

    In total 88 units were manufactured and installed, which were a combination of Series 42 fixed lights with curved and standard heads, as well as Series 80 3HS contra sliding units. Some of the Series 80 were 1.9m (h) x 2.3m (w) and weighed over 130kg when all assembled, so fixing points had to be tested for their strength to maintain integrity of the installation. The units came in 3 separate panes to enable manual handling and accessing the specific areas for installation. The transformation is truly stunning and has given the space a new lease of life, which will benefit the local residents for years to come.

    Established in 1966 and Royal Warrant Holder since 2004, Selectaglaze has a wealth of experience working on all manner of building styles, from Listed to new-build. Selectaglaze will be showcasing a variety of secondary glazing products on Stand D325 at 100% Design at Olympia on the 19th - 22nd of September.

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