It is difficult to predict the sound radiation from large flat factory roofs. This is because sound insulation is measured as the average over all angles of sound incidence. With large flat factory roofs one needs to know the sound transmission at grazing angles with directional sound fields. The research in this thesis examined what will be the best method for effectively modelling sound radiation from factory roofs. This research presents a simple analytic strip theory. Simple analytic strip theory has lead to the conclusion that it is mainly the length of the panel in the direction of radiation, rather than its width that is important in determining its radiation efficiency. The findings of the this research also indicated that apart from the effect due to coincidence, a panel was non-directional compared to an opening.

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