SUMMER MAINTENANCE
overlapping the one before to create a wave like ripple that announces the word ‘ZOO’ in big white letters below.
THE BEAR RAVINE
INCLUDES A CENTRAL BEAR PIT WITH A RAISED WALKWAY.
The entrance canopy is an iconic feature of the zoo but the curved shapes catch rainfall, which makes the structure vulnerable to standing water and the damage it can cause. Being cold liquid applied, Kemper System’s waterproofing system was ideal for following the exact contours of each curve.
JUST THE TICKET The Kemperol system was also used
to waterproof the roofs of the four ticket kiosks that are located beneath the entrance canopy, which were originally constructed without any waterproofing protection at all. This was because the structural concrete was perceived to be robust enough to withstand weather conditions, especially given the shelter afforded to the kiosks by the entrance canopy.
However, the risk of leaks to buildings of such architectural significance, which are built from concrete that is now almost 80 years-old, prompted DZG to incorporate the ticket kiosks into the roofing programme.
Specialist contractor, Dent Roofing, was tasked with carrying out this aspect of the project, installing the Kemperol system to two kiosks at a time in a phased programme to enable the Zoo to keep the remaining two kiosks operational and thereby avoid any business interruption during the works.
Each kiosk has a flat roof with a single outlet in the centre for drainage. Dent Roofing began the installation by applying primer to the bare prepared substrate followed by the resin. The resin saturates a reinforcement fleece in a single wet-on-wet process and cures to form a seamless, monolithic membrane that remain permanently elastic and is UV stable.
BEAR’S EYE VIEW Dent Roofing has also been
responsible for waterproofing the Bear Ravine; a much larger and more complex structure which has not been used as an animal enclosure for several years.
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The design of the Bear Ravine includes a central bear pit with a raised walkway and viewing platform that also forms a partial roof to a largely open building. This is accessed by a set of concrete stairs. There is also a viewing pier that extends out at a right angle beneath the main walkway.
For this structure, a quartz aggregate was scattered onto the wet primer to create a key for the waterproofing membrane and a solvent-free system was used; applied using the same methodology with resin, followed by 200g fleece and more resin, all installed in a single wet-on-wet process.
Julian Dent from Dent Roofing explained: “The curved lines that make the Bear Ravine such an iconic structure also make it a challenging waterproofing project. Fortunately, the liquid Kemperol system is ideal for following the individual contours of the concrete surface and we simply used smaller brushes to apply the resin to awkward corners.”
Once the waterproofing system to the walkway and staircases of the Bear Ravine was complete, the Dent Roofing team applied a quartz aggregate laid into the coating to create a non-slip surface. The team then moved on to the Bear Ravine’s concession stand. They started by mixing a paste of primer and resin which was then applied around the outside edge of the roof to ensure that there was no ‘run on’ of wet resin from the roof to the walls of the concession stand when the main roof area was being waterproofed. The system was then applied in the conventional resin-fleece-resin sequence with decorative quartz aggregate used to provide the finished look and complete the project.
Julian continued: “Kemperol 2K-PUR provides a high level of waterproofing performance, and is BBA-Accredited with a 25-year service life, ensuring that the Bear Ravine is protected and preserved for the next generation just as effectively as the Tecton structures at the Zoo’s entrance.”
www.kempersystem.co.uk TOMORROW’S FM | 35
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