The roof insulation - can be distinguished into: inside insulation for pitched roof and outside insulation for flat roof. More than 80% area of the roof of the CEE-building is pitched, so inside insulation was considered. At the beginning, there are two alternatives to be considered, which are (l) blown fibre insulation and (2) rigid pre-formed panels insulation. A sampled comparison of them shows that the construction of option 2 is more difficult than option 1, so evaluation of option 1 was carried out in Section V, and finally option l will be selected depending on the results of evaluation.