Journal of Korean Institute of Architectural Sustainable Environment and Building Systems ISSN:1976-6483(Print) 2586-0666(Online) 한국건축친환경설비학회논문집

The life time of a house is affected by physical and social factors. In December 2014, the Ministry of Land, Infrastructure and Transport established the standard for building and certification of long-life housing. However, as of September 2019, 99.81% of the total 647 cases received the general grade, except for one good grade. In order to expand the supply of long-life housing, it is necessary to improve the system along with the development of technology. The purpose of this study is to prepare the evidence for improvement of the certification system through the scale survey of the impact factors for each certification item. A survey of the importance of each item was conducted through expert survey. The survey targets long-term housing experts. It consists of 47 persons including long-life housing researchers, construction companies, and design firms. After examining the importance of each item, the level of technology development, and the construction cost, the conclusions were drawn on the measures by evaluation items. First, durability: The items to be maintained and strengthened are the design reference strength (fck) of the cover thickness and the quality of concrete. The items to be lowered are slump, unit bonding mass, water binder ratio, air volume, and chloride content among concrete qualities. Second, variability: The items to be maintained and strengthened are the existing bearing wall length and length ratio, the total drywall ratio inside the household, and the variable ease construction method. The downward revisions were made to the rise of the floor and the double bottom. Third, maintainability: maintenance enhancement items are designed to ensure the independence of common piping and dedicated facility space, and to easily replace and repair pipe wiring, and to be assembled. Downgrading consideration items include dry ondol, 20% of PS area of ​​main piping, and separate installation of spare piping space.