Points to watch – Do requirements

(a) Do fill all joints between parts of the floor to avoid air paths. (b) Do give special attention to workmanship and detailing at the perimeter and wherever a pipe or duct penetrates the floor in order to reduce flanking transmission and to avoid air paths. (c) Do build a separating concrete floor base into the walls around its entire perimeter where the walls are masonry. (d) Do fill with mortar any gap that may form between the head of a masonry wall and the underside of the concrete floor. (e) Do control flanking transmission from walls connected to the separating floor as described in the guidance on junctions.