Archetech Issue 24 2016 | Page 91

The company then prepared and cleaned the roof surface and, in the areas around the upstands where the failed membrane had not bonded, the team pulled off the damaged membrane. New insulation had to be cut to size and shape and this was done while the Kemperol V210 membrane was being installed so that the balconies could be completed as quickly as possible. The existing insulation, slabs and green roof medium were then reinstated to complete the roof. The team then moved onto the 8,500m2 former hotel roof, which comprises five ‘fingers’ with a central core. Hotel Roof Water ingress around the roof outlets meant that the recently installed warm roof insulation was already sodden and the roof had to be stripped back to the vapour barrier. The damage caused by the failed waterproofing membrane on the roof and balconies of the former hotel building was even more significant because the original roof build-up was not inverted. Having completed the strip out, Cawston Roofing allowed the concrete substrate to dry on each balcony and the decision was taken to reinstate the build-up for each balcony as an inverted warm roof. When weather conditions did improve, the Kempertherm sections were fixed to the substrate and joint sealed before application of the Kemperol V210 membrane began. Thanks to the replacement of the originally-specified waterproofing system with Kemperol V210, the building not only provides a stylish address on the coast that is warm and dry for residents but also protects a slice of the UK’s holidaymaking heritage and an iconic listed building. Page 91 - Archetech The balconies were tackled first, with strip out of the entire roof build-up. Here, not only had the originally-specified membrane failed, but the insulation below it had begun to rot too. To aid water run-off in the future, Kemper System designed a tapered Kempertherm insulation scheme, introducing a slight pitch to each section of roof. Cawston Roofing pre-primed each piece of board in an on-site workshop during the winter months to aid faster installation once the weather improved. Holiday Heritage