This report presents results and analysis from model scale tests carried out to validate calculation methods for estimation of the risk for fire spread between buildings. The basic parameters necessary to determine the risk for fire spread are: flame height and the incident thermal radiation. Knowledge about both these parameters is vital in order to estimate the risks properly. There is a lack of experimental information that considers the following important aspects influencing the propensity of a fire to jump from one industrial premise to another: heat release rate, size of an opening in a flashed over building, flame height and incident thermal radiation at different distances from the burning building. This report provides new data and better understanding of necessary input for such calculations. The model scale tests show good correspondence between a simple method to calculate heat radiation from a point source and experimental data obtained. Further, a simple and robust method to measure incident heat radiation is examined and evaluated.