Case studies matching "waterproofing"

Projects of complexity that demand innovative solutions to technically challenging interface design often deliver exceptional buildings. As a shining example, Axter recently completed the roofing systems for The Cheng Yu Tung Building, a landmark project for Jesus College in the heart of Oxford City.Systems in useStarcoat® PMMAForce Dalle®Excel®Cityflor®OverviewThis project required Axter’s extensive range of materials and methods combined to complete the multifaceted interfaces and deliver the demanding architectural design, whilst achieving the project’s ambitious goals.Founded in 1571, and with original buildings from this date, Jesus College is based in the centre of this diverse and historic city. With the development of the Cheng Yu Tung Building the college has undertaken its most significant transformation since the early 18th century.Combining new graduate accommodation, indoor and outdoor communal spaces, state-of-the-art teaching and meeting facilities with the latest digital technologies, this £36m innovative development is intended to have significant impact on the college faculty and students’ learning experience.Axter worked with architects MICA from early in the process, helping to specify solutions that would realise the design vision of lead architect Mandy Franz.“We’d worked with MICA before on a number of projects - including Keble College, University of Oxford - so they knew us and trusted us to add value through being involved with the design,“ comments Axter's Regional Sales Director, Matthew Saunders. “However, this project was a significant step up in complexity, with approximately 18 separate roof areas in total to complete. Looking at the main quad alone there is a raised area, numerous external stairways and walkways to waterproof as well as further raised terraces and inaccessible roof sections. Fortunately, we had significant experience to bring to this challenge.”Sustainability was the client’s major focus from the start, with the college already utilising ground source heat pumps, photovoltaic panels, and a heat recovery and cooling system to ensure zero carbon building operations, as well as reviewing all construction waste to ensure minimum diversion to landfill. We supported this aim working with main contractor BAM Construct UK to carefully plan and schedule the waterproofing systems to be installed, identifying the material composite of each roof to maximise efficacies in installation and logistics.The College’s key priority was to achieve a sustainability-focused design to reduce their carbon footprint. Naturally, this contributed to the challenges of the scheme, such as the additional fire safety requirements in response to the timber-framed construction. To help deliver the College’s ambitions, Axter supported the client’s design team by providing expert knowledge, understanding and application of the current regulations.Tapered roof insulation was used to support energy efficiency and drainage requirements, with bituminous waterproofing throughout. In keeping with the college’s sustainability mission, the main quad features a blue roof system to attenuate rainwater drainage. Other roof areas are finished with wildflower meadows. A combination of exposed and buried waterproofing membranes were consequently required, with additional complexity created by the range of different materials and surfaces involved.“Normally, if our membrane is marrying up to a vertical wall, we would see it come up as a visible detail,” continues Matthew, “but the beautiful Clipsham stonework used for the building façade wasn’t compatible with the typical detailing. We were also challenged by the desired architectural intent to defend the historic aesthetic of the stone, so we created a bespoke solution that has the required guaranteed watertightness whilst also delivering the architectural vision.”Additional challengesThe project started in 2020, just as the UK was trying to navigate the guidelines for operating during the COVID-19 pandemic. Matthew explains: “there were still restrictions in place, such as a general 2-metre distancing requirement, which was challenging in the tighter spaces, for example corridors where you literally couldn’t pass another person. We had an unusually hot summer also, which wasn’t helpful when you have workers in full PPE using 1,400-degree butane torches where use of naked flame was permitted in accordance with NFRC Safe2Torch guidance.”The overall scope of the project, which encompassed multiple terraces at different levels and a mixture of concrete, CLT and steel frame structural composites, was a defining characteristic. “This was a large-scale development to begin with,” adds Matthew. “Furthermore, the university emphasised from the start the centrality of the significant sustainability objectives, and MICA had ambitious solutions in mind in terms of the materials used. Our job was to accommodate these various requests while keeping in mind all of the regulatory and compliance requirements. Achieving those without exception, for a large number of surfaces, does become more challenging where each part of the project has several ambitious aspirations intersecting with one another. Fortunately, we are known for always rising to a challenge.”SolutionsThe pandemic accelerated the shift to a range of technological solutions replacing traditional or face-to-face approaches. Systems were evolved for everything from distancing to digital rather than traditionally signed delivery acceptance.“As a manufacturer, we don’t have to be on site every day,” notes Matthew, “but traditionally we would attend fairly frequently, as well as meeting regularly with partners to agree and then oversee various aspects of the project plan. Fortunately, Axter was already moving towards solutions such as virtual meetings, so we simply shifted much more quickly to those approaches, using them wherever possible.“I think one advantage we have is the breadth of the product range we design. We can offer clients such as Jesus College a full system approach involving multiple solutions, to ensure we use the right system for the right application on each occasion. Our accredited installers are carefully vetted and trained by us, and have worked with us for long enough to know our products inside out.”The range of products we are able to offer, all developed in-house, does testify to the culture of Axter. Comments Matthew: “We are very much a technically-oriented company and that runs through every aspect of our work and our staff. Our sales team are all very aware of the products on that level, they aren’t selling products they don’t fully understand the technical details of. Our long-term partners know that what we offer them is reassurance that, from early-stage design meetings through to completion, whatever challenges they put to us, our response will be considered and robust in terms of quality and compliance.”Systems and products usedExternal stair cores used Axter Starcoat PMMA liquid waterproofing membranes.For the main quad and some lower areas, our innovative Force Dalle warm roof solution was used.Our Excel reinforced waterproofing membranes were used as an exposed membrane finish, with a tapered insulation to ensure the falls and consequent drainage characteristics required by BS 6229.Axter’s Cityflor warm living roof membranes were used as buried applications in several roof terraces, again with tapered insulation.Self-adhesive membranes were used where necessary to ensure compliance with NFRC Safe2Torch Guidelines, especially required due to the timber elements.Acknowledgments"To deliver the increasing demand on a building’s performance specification, combined with the seamless aesthetics of contemporary architectural design, an advanced understanding of technical detailing is required in the design and construction process. The design criteria have also resulted in an extensive range of engineered systems on the market to provide certified, technical solutions for multifaceted interfaces.Working directly with the designers and product manufacturers, we prioritise a full system approach to the weather-tightness of the building, focusing on durability, termination and compliance with current regulations. I have worked with the team at MICA Architects and Axter’s Matthew Saunders on a number of challenging projects, including The Cheng Yu Tung Building, Jesus College, and the HB Allen Centre, Keble College. Matthew Saunders has always been a key consultant for the technical specification of above ground waterproofing systems and the buildings’ thermal performance. He’s an expert in technical detailing and advisor on the materials required to deliver the optimum waterproofing system for the building."Eric O’Hare, Design Manager, BAM Construction www.bam.co.ukWith special thanks to: Tomasz Zozak, who provided the photographs, and BAM Construction Ltd.

The Rhondda Heritage Park is a renowned tourist destination in South Wales, offering a glimpse into the coal mining community that thrived in the area for over 130 years until the early 1980s. Every year, thousands of visitors take a guided tour led by former colliery workers to experience the life of coal miners.The Heritage Park takes great pride in its appearance and the local heritage it represents. However, the aging asphalt roof terraces that covered the old mine shafts had been leaking constantly, damaging the visual appeal of the visitor site.The ChallengeThe Polyroof technical team was called in to help with the waterproofing and refurbishment of the two roof terraces, measuring over 1100m², that protected the underground mining attraction. After conducting a thorough survey of the roof terrace areas, a customized specification was prepared. This specification included a comprehensive set of recommendations for addressing the issues that had caused the aged and worn condition of the terrace areas over the years. To support the proposal, additional information was provided to the client to demonstrate how a liquid system could seamlessly encase and waterproof the terraces while maintaining an aesthetically pleasing solution that was true to the authenticity of the site.Satisfied that the solution proposed would provide the long-term peace of mind they were looking for, the Heritage Park awarded the contract to RM Polymers Ltd.Before starting the work, any areas affected by fungal growth or moss were treated with Polykill Anti-Fungal Wash to eliminate all spores. Any holes in the asphalt were smoothed out or removed, and levelled using Polyroof Structural Repair Mortar. All large cracks and voids were cleaned and repaired using the same mortar.PVC protrusions were removed and surfaces were cleaned with acetone. Any damaged, loose, or unsound concrete or brickwork was removed and repaired using Polyroof Structural Repair Mortar. All repairs were allowed to cure and dry before priming.The SolutionOne of the main features of the tourist attraction is the mining carts that were used to transport coal around the mine tunnels during its operation. Similar to train tracks, the mining cart tracks are fixed into the ground using metal bolts and fixings which over time had become a weak point for water ingress. Concrete and sandstone had been used as a “quick fix” to prevent rainwater entering the mine shaft below but a long-term solution was now needed. The cement and sandstone was carefully chiselled from the rails, exposing the original metal tracks which were then lifted and abraded back to their original condition. Whilst lifted, the underlying surface was made good before the application of the Protec System. Railway sleepers were then laid on a sacrificial layer on top of the waterproof membrane, upon which the tracks and mining carts were re-instated.As the terraces are constantly trafficked by the general public, the client was clear that an anti-slip finish would be required on any walkway areas.Following the application of the Protec System, Polyfinish and Quartz Sand Anti-Slip was applied to all walkway areas, to provide slip resistance and surface protection. A 50mm margin around the perimeters of the terrace was masked off to provide a neat termination of the anti-slip finish. Ensure masking tape was removed whilst resin was still wet. Then a third coat of Protec Resin was applied at a minimum coverage rate of 0.5Litres/m² (2.0m²/Litre) and whilst wet, clean dried quartz sand (0.7 – 12mm) was broadcast at an approximate coverage rate of 4.0kg/m². Once cured, the loose sand was removed.WorkmanshipThe engine houses along the tour experience featured vast amounts of intricate details and unique items and structures, such as “Bertie and Trefor” – the names given by the mine owner to the mine head stock wheels. This presented an exceptional challenge, particularly in regards to the difficulty of working on the intricate details of the degraded mastic asphalt upstands and decking.As a result of many years of weathering and gravity, the vertical sections of asphalt on the raised terraced roof had slumped and rippled, leading to stress cracks and ultimately water ingress. To overcome this ugly problem, the asphalt was stripped from these vertical sections back to the concrete and removed from site in accordance with the Health and Safety policies in place. The contractor then installed new 18mm OSB3 to these areas to create a flat substrate for the Protec System. The incorporation of Polyroof pre-formed GRP Drip trims at the bottom of the OSB3 ensured the timber would not be exposed to any rain water in the future as well as provide a neat, edge detail.To keep the overall aesthetic feel of the site, the application of the liquid waterproofing system at wall abutments was critical. This, combined with the undulating nature of the stone and brickwork meant that the contractor would not be able to install a cover flashing or termination bar. Instead, the contractor carefully dressed the system onto the wall to the standard minimum 150mm upstand height and into a chase.The edging was then finished with a mortar to provide a neat and clean weatherproof finish, in-keeping with the traditional methods of the site at the time of its construction.The roof terraces that cover the old mining areas also act as the main walkways to the Heritage Centre’s tour routes. Therefore, one of the main challenges of the project was the complex planning of the works to ensure that the site continued to operate so not to financially impact the heritage park. It was imperative that works were complete within an 8-week period with 17,500 visitors booked in for their annual Santa’s Grotto Experience Tour beginning in early December.The application speed of the catalyst cured Protec System, combined with communication between the contractor and the site to ensure unobtrusive installation, meant the centre stayed open and the tours running with minimum disruption.The benefits of using a fast-curing liquid waterproofing solution were also vital due to the ever-changing micro-climate in the Welsh valleys. On any single day, the weather would serve up anything from bright sunshine to windy, rainy conditions. Therefore, the fast-curing Protec System, combined with the flexibility of the installation team, who gave up weekends when required, ensured the project was finished on schedule. The works were completed to an extremely high standard with full encapsulation of the roof terrace areas and without a single detail being left exposed to the elements.ConclusionThe unique aspects of this project certainly kept the team on their toes. But they were determined to complete the project on time.The team worked tirelessly, even giving up their weekends to ensure that the project was completed on schedule. Despite the harsh Welsh weather, they pushed on and were determined to make sure that Santa could visit the children of the Welsh Valleys. It was a challenging project but the team’s hard work and dedication paid off.Finally, the project was completed and the results were astounding. The roof terraces are now fully waterproofed and refurbished, and the visual appearance of the visitor site was greatly improved. It was a project that was both memorable and rewarding to all those involved.