Airtightness Data and Characteristics of 752 Residential Units of Reinforced Concrete Buildings in Korea

This paper presents airtightness data measured for about 752 units of high-rise reinforced concrete buildings (apartment buildings) that have been recently constructed within five years in Korea. Target buildings were mainly constructed by using reinforced concrete walls/floors, and dry/wet walls were installed between units. Airtightness data of residential units were analysed based on values of ACH50 and air permeability. To identify the airtightness characteristics of reinforced concrete residential buildings, the measured airtightness data were analysed in terms of the dwelling unit sizes, wall types between units, and flow exponent n. The ACH50 values of the dwelling units were measured to range between 1.02 and 4.81, and the average value of the measured units was 2.39. It was found that the flow exponent of the measured units was 0.61 on average. The airtightness prediction model was derived by examining the correlation between a variable by component area and a variable by connection length, and performing regression analysis on these correlations. The ACH50 value tended to decrease as the floor area increased.