A team of Guardian Waterproofing employees headed to Koster Aquatecnic’s training centre for two days of hands on training in a new type of roof waterproofing. They had their own roof rig, which had some awkward corner detailing and piping to navigate! It gave Guardian complete training in the installation and design requirements from start to finish. Koster are so confident in this product that they are offering up to 25 year warrantees.