ROOFING SYSTEMS
themselves with the liquid product application. Full system training ensured that operatives were confident in applying the wet-on-wet, cold-applied resin from Kemper System. Technical representatives from the manufacturer also visited the site during the project to advise and support the installation team.
Quality installation
Noble House Services (UK) first cleared the roof of all redundant services, removing as much a feasibly possible without causing disruption to the running of the hospital. The existing asphalt roof was then cleaned and the Kemperol waterproofing system 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 achieved. Contractors knew enough resin had been applied when the fleece was no longer visible, meaning optimum saturation was assured.
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, 160 mm extruded polystyrene (XPS) insulation board, and a concrete-faced 50 mm insulation board, followed by paving slabs to the perimeters to add additional ballast to the roof build-up.
A number of complexities 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, and upstands and roof hatches for access. Because Kemper System’s waterproofing solution is roller- applied, operatives could easily install the resin underneath the units and around the complex roof structure, once again creating a seamless finish without any joints or potential weak spots for leaks to develop in the future.
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.
Cold-applied waterproofing One of the main reasons why cold-applied Kemperol was specified for the roof
100 Health Estate Journal October 2018
Liquid resin being roller applied to completely saturate the reinforcement fleece in a single wet-on-wet process.
Once the reinforcement fleece is laid into the first layer of wet resin, more resin is immediately applied on top.
Reinforcement fleece being laid into the wet resin.
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