In order to make clear the effect of rooftop lawn-planting on the thermal environment, outdoore xperiments were carried out with lawn-planting mock-ups throughout two years. This paper for the first part of our study describes the outline of mock-ups and measurement items and measuring methods. Main subjects of the paper are about diurnal and annual characteristics of heat budget for the foliage layer of lawn-planting. The following items were analyzed with the experimental data. 1. Reflected solar radiation from the surface of lawn. 2. Radiant temperature of lawn and temperatures in the lawn-planting layers. 3. Heat flow below the layer of foliage. 4. Heat capacity of the layer of foliage.
