Simplified Representation of the Thermal Behavior of Flat-roofs.

On the basis of the results of digital simulation of the thermal behavior of four types of insulated flat-roofs subjected to the climate of ten weather stations distributed over France, the paper links the maximum thermal load effects at the different levels in the roof with simple weather data. The meteorological magnitude selected is the equivalent temperature and its extreme variations. Correlations between the thermal loads in a variable state and the load effects in a steady state provided with a corrector coefficient depending only on the types of roof studied are established.