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RCI Feb 2018

Project1_Layout 1 07/05/FLAT ROOFING & WATERPROOFING SYSTEMS Kemperol is the remedy for Lewisham Hospital Lewisham Hospital is run by Lewisham and Greenwich NHS Trust. The history of the site dates back to 1612 when it became a workhouse for the sick and poor in the area. When the Lewisham Workhouse became overcrowded, a new building was erected at the site in 1817 to meet demand. A separate infirmary was then built in 1892 – this building now houses the hospital’s pathology department at the site today. Following the formation of the NHS in 1948, the hospital continued to expand with new buildings opening in the 1950s and 1960s. Today, Lewisham Hospital offers a wide range of specialist services and gained university status in 1997. Lewisham and Greenwich NHS Trust realised that some of the buildings were in need of repair. The existing felt roof above the main building and outpatient department had failed. Kemper System’s Kemperol 2K-PUR was selected to provide a durable and long-lasting waterproofing solution. In this article, I will look at why Kemper System was specified, and the installation challenges faced by contractors, Noble House Services (UK). Quality installation Because of the nature of the building, there was a need to ensure the project avoided any disruption or nuisance to staff and patients in the unit or the surrounding wards. Kemperol 2K-PUR is an odourless cold-applied solution, and was used to refurbish the 1,600m2 roof area that needed to be repaired. Noble House Services (UK) first cleared the roof of all redundant services, removing as much as feasibly possible without causing disruption 060 FEBRUARY 2018 RCIMAG.COM to the running of the hospital. The existing asphalt roof was then cleaned, and the Kemperol 2K-PUR resin was applied directly to the existing roof coverings in a single wet on wet process. Reinforcement fleece was laid directly onto the first application of wet resin, immediately followed by more resin on top to ensure complete saturation of the reinforcement fleece. This provided visible assurance that the correct amount of resin had been used throughout, and a consistent depth of coverage and membrane thickness was achieved. Once cured, the system forms a seamless, elastomeric waterproof membrane that cannot delaminate, is UV stable, and creates a strong bond directly to the substrate. Contractors then installed an inverted insulation scheme, comprising a closed-cell, 160mm extruded polystyrene insulation board, concrete faced 50mm insulation board, followed by paving slabs to the perimeters to add additional ballast to the roof build-up. The roof area had a number of complexities with many ventilation outlets, up-and-over staircases and walkways, steel beams supporting the units on the roof, as well as upstands and roof hatches for access. As Kemper’s waterproofing system is roller-applied, operatives could easily install the resin underneath the units and around the complex roof structure. The solvent-free and odourless qualities of the Kemperol system also meant minimum disruption at the hospital throughout the application process. No hot works were required as part of the refurbishment, further reducing potential health and safety risks, with no wait time between applications of resin. An ideal solution Thanks to the speed of application of the Kemperol 2K-PUR system, vital services provided at the hospital were able to continue with little disruption to staff or visitors. Matthew Bigley, capital projects and estates manager at Lewisham and Greenwich NHS Trust, comments on the success of the refurbishment. He said: “The roof area, which needed attention, was above the main entrance, as well as the radiology, cardiology and MRI departments. Refurbishment of the roof using Kemperol and the inverted insulation scheme has provided higher thermal performance and energy saving benefits for the building. We are extremely pleased with the finished project, which was completed on time and within budget.” Contractors were able to install the Kemperol liquid waterproofing system quickly and safely, without the fire risk of hot works, despite the complexity of the roof area. Gerry Ogborn from Noble House Services (UK), added: “We didn’t experience any issues when installing Kemperol 2K-PUR. It was not only easy to transport with minimal materials and apparatus to carry, but the liquid-applied resin meant we could get underneath and around the complex roof structure and detailing with ease to provide a seamless waterproofing solution.” Kemper System will be exhibiting at next month’s Ecobuild exhibition, which will be taking place between 6-8 March at the ExCel in London. Visit the company on stand C51 to discuss it can help you with your latest roofing project or waterproofing needs. www.kempersystem.co.uk Stuart Hicks from cold-applied liquid waterproofing specialist, Kemper System, explains the challenges surrounding the roof renovation of a busy London hospital


RCI Feb 2018
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