Chronological change of the characteristics of rooftop greening architecture and spatial composition of rooftop green spaces from the viewpoint of degree of openness

This study aims to clarify the relationship between buildings and attached rooftop green space from viewpoint of degree openness, chronological characteristics. Some 1,304 spaces developed by 2020 were collected monthly magazine "Shin-Kenchiku (New Architecture)" specialized books classified into three categories openness such as full open, limited open closed public, cross tabulation indicators including location, establisher, presence or absence staying attracting facilities, shape components in each category was performed. As a results, public institution those for visitors more facilities open. Besides, number plant species its combination has increased since 1990s became garden fully opened while lawn plantings have spaces. On other hand, 2000s with installation on highest floors plantings.