This paper presents results from the first phase of a project to characterize flanking sound transmission at wall/floor junctions in wood-framed constructions suitable for multifamily residential buildings. This phase of the study focused on the junction between a wood joist floor and a separating wall with two rows of 38×89-mm studs. The objective of the study was to identify details that simultaneously provide good noise control and fire resistance. This paper presents the experimental approach and key results from the acoustical measurements. In addition to comparing how five common fire control solutions for the floor/wall junction affect the airborne and impact sound transmission, several generic retrofit modifications to reduce the structural noise transmission were tested. Parameters studied included the floor-joist orientation (parallel or perpendicular to the separating party wall), and the type of subfloor (plywood or oriented strand board). The study has shown that suitable details can provide both adequate fire resistance and noise control. The technical approach provides a framework for extending beyond established laboratory measurement procedures, to predict performance in actual buildings.