Please Note: the values predicted by this tool are only intended to be used for preliminary indicative purposes because there are many other factors besides specification of the wall or floor format that will affect acoustic performance e.g. junction details, exact specification of products, adjoining construction form and workmanship during construction. The tool is based on empirical interpretation of test data from structures in the residential, health and school sectors to predict the acoustic performance of the user's chosen arrangement so although these additional factors are not specifically included, their effect is built in to the underlying data allowing a realistic assessment to be made.