ProjectAn area of about 1,500 sqm of the façade of Adalbert-Stifter-Gymnasium was decoated by means of the hot-water HD method, as it was not permeable and, in parts, blisters had developed. The flawed window sills, pilaster strips and rusticated blocks were reshaped and, finally, the entire surface was coated with silicate paint. The works were executed in the 2017 summer holidays.