CoatingsPro Magazine

MAR 2017

CoatingsPro offers an in-depth look at coatings based on case studies, successful business operation, new products, industry news, and the safe and profitable use of coatings and equipment.

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56 MARCH 2017 COATINGSPROMAG.COM material to be applied directly on top of the existing substrate. ere was no need to remove the existing roofing materials, including old waterproofing membrane, concrete topping, and thermal insulation roof tiles," stated Wong. With the water- proofing system chosen for the job, the HKP team was ready to get to work on the 8,000-square-foot (743.2 m²) project. School Holiday = Heat and Humidity A nd here is where the less-than-optimal timing comes in. It was decided that the job would take place during the summer holiday; this way, the HK P crew would not have to worr y about students, teachers, and other staff being onsite during the project. W hile the fact that the students and staff were not onsite was definitely a plus for the crew, the time of year was not even close to being favorable. May, June, and July are the hottest, wettest months in Hong Kong. Extreme heat and humidity are not exactly the best conditions for the application of a coating system on the top of a building with no protection from the elements. According to Wong, Hong Kong also experiences frequent thunderstorms and occasional typhoons during the summer months. It had the potential to be quite a mixed bag for weather-related events…and setbacks. High humidity isn't just uncomfortable for the workers. It can often cause coating materials to blister and delaminate, as well as prolong the curing time and reduce the coatings' bond strength to the substrate. If the air temperature is also high, the heat and humidity combine to make the situation even worse. To prep the concrete, the crew used a blower, vacuum, and 3,000-psi (20.7 MPa) pressure washer. Once it was time to apply the polyurea, they'd also need to mop the substrate to remove moisture. Concrete Roof Recoat Wr i te in Re ad e r In q u ir y #260

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