MEASURING OF OVERALL BUILDING CONDUCTION HEAT LOSS COEFFICIENT. Several ways of measuring the k-value of a building have been presented through the years. All of these have been based on the measuring of one or more points in a construction. Since the heatflow through a building construction is not evenly spread, several measuring results have to be obtained to receive a mean value. The method presented in this report is based on the much simpler principle that the amount of used energy is equal to the amount added. The theory is obviously very simple. The reality, however provides some practical problems. The report describes how to measure the k-value in a building construction without being bothered by thermal bridges and air leakage. To illustrate this principle, measurements from three different types of constructions are described. The project has been carried out in connection with a Nordtest-method according to the same principle. Finally, I would like to emphasize that without the contributions made by the biker and technical expert Per Fahlén, the carrying out of this report would not have been possible.