Refurb Projects - November 2018

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PROJECTS Weber floor screed keeps everyone on their toes at everyone active leisure centre In the first phase of improvements to Watford Woodside Leisure Centre in Hertfordshire, one of two stateof-the-art facilities in the town managed by Everyone Active, high performance weberfloor 4310 fibre flow by Saint-Gobain Weber has been specified by main contractor Bosun Design & Construction Limited (BDC), Chandlers Ford, Hampshire. Everyone Active is the trading name for Sports & Leisure Management Limited (SLM), the UK’s longest-established leisure contractor. It manages more than 170 leisure and cultural facilities around the country in partnership with 49 different local authorities and trusts, and is currently carrying out a £1.8million improvement project across its Watford Woodside and Watford Central leisure centres. “Working alongside Watford Borough Council, we are supporting local people of all ages and abilities to improve their health by offering them access to top-class leisure services and facilities,” said Gary Foley, Everyone Active’s contract manger in Watford. “This project to update both locations will make a huge difference to our members, providing them with a new fitness studio to cater for the growing demand in group exercise, refurbished changing facilities and a significantly improved fitness suite that will offer the latest state-ofthe-art equipment.” “We undertake contracts for Everyone Active at numerous sites in the south east,” comments James May, director at BDC, which is carrying out the work in Watford. “Multiple contracts are on-going at any one time. The process of selection is via tender direct to Everyone Active, which then works with the local authority. It is at this stage a preferred contractor is proposed.” Included in the current phase of the works is the creation of a new mezzanine floor. It has been installed in the space above a former dance studio and adjacent squash court, and has enabled a brand new fitness studio to be created. The current studio has also been extended. The second phase of development is due to begin at both Watford sites shortly, for completion in early 2019. BDC is actively involved in both projects. Subcontractor C E C Plastering, of Southampton, undertook the application of weberfloor 4310 fibre flow screed. Director Chris Crosby says: “Together with Bosun Design & Construction we specified this fibre reinforced self-smoothing compound which we pump-applied at various thicknesses from 35- 50mm. It was quick and easy to install, very versatile, and has produced an excellent finish. We’re fans of this product and have used it before but, even so, we benefited from Weber’s technical support.” weberfloor 4310 fibre flow screed was applied to a steel framed block and beam floor construction which overcame the concerns around loading issues that might have arisen with the application of a traditional concrete screed. The new floor was initially primed with weberfloor 4716, a water-based primer designed for use with all cementitious and hemihydrate floor screeds. It regulates the porosity of the substrate, improves the adhesion of flooring products while reducing the formation of pinholes in the levelling layer. It should be diluted with clean water and can be spray applied on large areas. weberfloor 4310 fibre flow screed is designed for application at thicknesses between 5 – 50mm and formulated from special cements, aggregates, supplementary binders and chemical admixtures. It is supplied as a blended dry powder and designed specifically for renovation of existing floors and floating floor construction in domestic and commercial applications. weberfloor 4310 fibre flow can receive foot traffic after just 2 - 4 hours and can be tiled after 12 - 24 hours, dependent on ambient temperature following installation. The fibre reinforcement aids durability and allows it to be used in conjunction with under floor heating systems and floating floors. weberfloor 4310 fibre flow has excellent spreading and smoothing characteristics. It has low alkalinity and low emissions during drying and is casein free. Almost 500 bags of weberfloor 4310 fibre flow were required to finish the 190m² mezzanine floor in preparation for a final wood sprung floor suitable for dance and other physical education where shock absorption is essential to enhance performance and reduce the risk of injury. weberfloor 4310 fibre flow is featured in Weber’s one hour long RIBA-Assessed ‘Introduction into Flowing Floor Screeds’ CPD which can be presented by Weber’s Specification Team at your premises or at a Saint-Gobain facility or Training Academy anywhere in the UK. It is free of charge and available on request. This comprehensive CPD presentation covers many subjects from why and where to use floor systems; the attributes of commercial floors; design considerations; the demands of the finished floor that will have an influence on specification, through to renovation, fast-track construction and drying times. The CPD includes an application video showing the attributes of weberfloor 4310 fibre flow smoothing compound which is of specific interest to both designers and applicators. Weber’s floor screeds and tile fixing products are manufactured in sustainable, modern manufacturing facilities in Bedfordshire, Shropshire and Ireland, ensuring product quality, conformity and availability, with reduced transportation costs and CO emissions. Weber has a team of experienced technical advisors who are available to provide advice both at the specification stage and during application. Detailed specifications can be provided for specific projects while site visits and on-site support can be arranged. For more information about the Flooring CPD, to make a booking, or for technical support including award winning training courses, please contact Saint-Gobain Weber on 08703 330 070, or visit www.uk.weber. CPD bookings can be made by email: mail@netweber.co.uk. 40 NOVEMBER 2018, REFURBISHMENT PROJECTS
200 year old warehouse converted to first Passivhaus hostel in the UK Building physics and services engineer Greengauge has provided a complete holistic advice package on the remodelling and retrofit of the Barrel Store, the first and only Passivhaus certified hostel in the UK. Completed in 2016, the exceptionally performing building won the Cirencester Civic Society Design Award 2016 and is a finalist in the UK Passivhaus Awards 2018. But these accolades belie a humbler beginning. BACKGROUND Situated in Cirencester, the Barrel Store was constructed around 1820 as a warehouse to serve the adjacent brewery, which closed in the early 20th century. By the 1970s, the derelict but solidly built Cotswold limestone building narrowly escaped demolition and instead was converted into a theatre. The building sustained this use for several decades, but the theatre recently closed as it was no longer fit for purpose. The New Brewery Arts charity, which had managed the theatre along with two other nearby former brewery buildings, decided to convert the Barrel Store into a youth hostel. This use would provide much needed affordable and stylish visitor accommodation for people attending New Brewery Arts courses and workshops. PASSIVHAUS ENERPHIT RETROFIT The ambitious scheme put together by Greengauge and Potter Church & Holmes Architects proposed a Passivhaus Enerphit retrofit for the building. “I believe our proposal was chosen because it was the only scheme that included Passivhaus,” says Peter Holmes the Architect and director at Potter Church & Holmes Architects. “It may also have been that we proposed a groundbreaking, low energy hostel that would attract people and would result in minimal running costs. We were a good, local team of consultants that were very committed and enthusiastic about the project.” The project brief was fairly straightforward, asking for a hostel that provided 48 beds, a kitchen, dining area, entrance, laundry, office and storage. But a Passivhaus Enerphit retrofit is inherently more difficult than a new build. Thankfully, this project was simpler than most retrofits as everything internal was stripped out leaving the building’s shell, which was in good condition. Two new floors were formed requiring new load-bearing internal structures and the roof space was used to house the mechanical plant. “This project touches on all of our key services,” says Toby Cambray, co-founder of Greengauge. “We did all of the M&E design, the Passivhaus consultancy, which involved specifying and doing the calculations for the insulation, the triple glazed windows and supporting the architect in the detailing. We also completed a moisture risk analysis using WUFI [a specialist software tool which simulates how moisture moves through a building’s structure].” INSULATION CHALLENGES Despite the brief’s simplicity, the project still had its own unique set of challenges. One of the most testing aspects involved the insulation. Given that the building is situated in a conservation area, the insulation required to help achieve Passivhaus could not be fixed to the outside of the stone building. Instead, it had to be fixed on the inside. This decision had a knock-on effect on the hostel’s proposed layout. As the building is long and narrow, the insulation thickness required would take up valuable internal space resulting in fewer beds. The realised scheme provides 14 bedrooms, 13 with en-suite bathrooms, and 48 beds, while still insulating to the level required for Enerphit. A semi-circular oak staircase lined with ash boarding, like a barrel, was introduced into the centre of the hostel. This high quality architectural feature elevates the interior and draws in daylight via a new rooflight. Internal Wall Insulation (IWI) has to be specified carefully because the masonry behind the insulation in a heated building will become colder than before. This increases the risk of moisture accumulation and slows down the rate at which the masonry can dry out. This in turn can increase the risk of mould and damage to the existing stone, new timber structure and the insulation. To this end the solution employed involved the construction of a highly insulated timber-framed ‘building’ inside the existing stone walls. This structure was built off an insulated concrete slab, which helped to thermally isolate the new timber structure from the ground and walls. The semi-basement was filled in with compacted granular material and 350mm of polystyrene insulation below a concrete raft to create level access. MOISTURE RISK ANALYSIS The specialist skills offered by Greengauge played a major role here by modelling the proposed structure in WUFI to check how it was likely to perform. “We had to make sure we managed the risk of moisture accumulation,” says Cambray. “The dynamic movement of water, vapour and liquid form is something that the WUFI software can assess, which other simpler assessment methods don’t.” A lime plaster parge layer was applied to the internal stone walls and then a continuous 100mm thick rigid wood fibre insulation layer was fixed to the masonry. The new timber structure, filled with 80mm thick flexible wood fibre insulation, was then built inside the rigid woodfibre board which is thermally separated from the walls and floor. Minimising thermal bridging and ensuring air-tightness in the building were other critical factors that helped to achieve Passivhaus. Greengauge drew up twodimensional models of proposed key junctions using the THERM software to analyse heat transfer and to evaluate any potential problems with condensation and moisture risk. HOT WATER AND VENTILATION Hot water demand at the Barrel Store was anticipated to be high given its hostel use. Greengauge PROJECTS specified a direct gas-fired water heater that heats a 370-litre cylinder, which supplies approximately 40 showers in two hours. Some of this heat is diverted into space heating when needed. A small 10kw plate heat exchanger takes heat from the cylinder and sends it around the hostel’s small radiator circuit. Like all Passivhaus projects ventilation is important. This is provided via two mechanical ventilation with heat recovery units, which serve the left and right halves of the building. Ventilation is demand controlled based on relative humidity and is supplemented with fresh air via the windows. AT THE FOREFRONT OF PASSIVHAUS Another contributing factor which helps to achieve Passivhaus certification is a good builder. One who is meticulous about ensuring against air leakage and keeps a clean, dust-free site. David Gilkes, managing director at DJP Construction, who was the Barrel Store builder, says it was the first Passivhaus project he had worked on and he is now a Passivhaus convert. “It was a very rewarding job and it has had a huge impact on how we construct other projects,” says Gilkes. “We realise that to achieve Passivhaus is not as difficult as we had thought as long as you follow specific criteria. Toby [Cambray] at Greengauge was fantastic and because of his knowledge and experience in Passivhaus he was very considerate and supportive. Greengauge is at the forefront of Passivhaus and is miles ahead of any other consultants we’ve worked with.” Holmes agrees adding: “Greengauge is not just a services engineer, it also has energy consultants with specialist knowledge about low energy buildings. They are a young firm that is growing very fast and has a really interesting range of skills. This broadening skills base within this overall area of expertise is uniquely theirs.” The energy efficiency of the hostel means that the client should use less than 50% of the energy of a traditional construction. The client has confirmed that the building requires very little maintenance, which maximises the time the hostel is open. This is particularly important as the Barrel Store forms an integral part of the New Brewery Arts financial model; its efficiency therefore directly benefits its charitable organisation. 01225 862605 hannahrayner@ greengaugebuildingenergy.co.uk REFURBISHMENT PROJECTS, NOVEMBER 2018 41
Page 1 and 2: REFURB PROJECTS - THE JOURNAL OF RE
Page 3 and 4: Contents Vol. 29 No.192 November 20
Page 5 and 6: A deprived building and local commu
Page 7 and 8: PROJECTS HVRF offers a perfect blen
Page 9 and 10: ROOFING SFS flat roofing solutions
Page 11 and 12: Gold award for Nottingham City Home
Page 13 and 14: EDUCATION INFRASTRUCTURE £10m fund
Page 15 and 16: Hox Haus - for Hox Park EDUCATION I
Page 17 and 18: EDUCATION INFRASTRUCTURE the old ex
Page 19 and 20: EDUCATION INFRASTRUCTURE Liverpool
Page 21 and 22: EDUCATION INFRASTUCTURE the buildin
Page 23 and 24: Safer Heating For SEN School EDUCAT
Page 25 and 26: PROJECTS Restoration of Grade II* l
Page 27 and 28: Gilbert-Ash Completes Extended Arno
Page 29 and 30: PROJECTS WRW chooses incentive TEC
Page 31 and 32: Cedar shingles help enhance the sou
Page 33 and 34: Impressive entrance for Council Off
Page 35 and 36: PROJECTS Glendyne restores historic
Page 37 and 38: TV presenter returns to Sherwood to
Page 39: New development contributes to the
Page 43 and 44: Millcroft Supports Conservation at
Page 45 and 46: PRODUCTS & SERVICES DIRECTORY BUYER
Page 47 and 48: PRODUCTS & SERVICES DIRECTORY BUYER
Page 49 and 50: WOOD AWARDS 2018 STRUCTURAL AWARD T
Page 51 and 52: THE DESOWOOD REPAIR SYSTEM A DURABL

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