Because of increasing complaints of disturbance from impact noise in multifamily dwellings, the Federal Housing Administration plans to include in their Minimum Property Standards some recommendations for the control of this noise. A study of the existing noise codes and several surveys of public reaction to household noise has led to (1) the recommendation of a criterion of acceptability for floor/ceiling constructions in multifamily dwellings; a listing of floor/ceiling structures commonly used in the U S A, classified as to their ability to meet the criterion, and (2) a set of recommendations and suggestions regarding important structural details. This paper gives the results of that study and tells how they were arrived at.