In this study, It is investigated the relationships between deteriorations of finishing materials and carbonation of concrete using a model building at the age of 11 years. It is measured the carbonation depth, deterioration of finishing materials, and so on. And, it is carried out the accelerated carbonation test on the specimens after natural exposure test. According to the results, some natural exposure test results are different from accelerated carbonation test results on same conditions specimens. So, it seems that it is important to take account into durability of finishing materials for evaluation on the protection effects.