Abstract
The purpose of this paper is to analyze the construction on site and the airtightness of 17 houses which were built by 7 different house builders by using the same method which was built by the construction method with vaporproof/airtightness and thermal insulation from the outside of the wooden frames. The results of this study were as follows : 1) The external wall works for 17 houses needed 16-33 man-days per house. The house builders who were unskilled in this construction method needed more man-days than those who were used to the method. 2) The effective open area of the 17 houses measured 1.1-3.8 cm^2 per floor area. And the results also show that the houses with simple-formed walls had better airtightness. 3) The airtightness of houses which were built by the method with thermal insulation from the outside of the wooden frame increased by securing the vaporproof/airtightness of the continuous footing.
