In summer 2007 a housing project will be build, reachable within 20 minutes by car from Granada. It contains 33 single family houses , 21 apartements and 40 dwelling units social housing. The goal of this project is to achieve moderate temperatures without electric equipement during most of the time. Energy use achieves so called "Passivhouse Standard". For this project we have to adapt "cooled soil" in weight and thickness. Hygrothermal simulations showed the possibility to evaporate under the roof insulation 200 g Water per day and sqm in this climate. The cooling caused by evaporation is estimated the same value as Givoni found in his investigations. This paper deals with the hygrothermal behavior of the "light weight cooled soil" on the very first flat roof. We will monitor and investigate the heat flux, the in- and outdoor climate and evaporated masses of water. The second part of the paper shows the thermal simulations referring to the both strategies.
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