Laminate underlay and expansion gaps done right
Laminate floats, so the underlay does the cushioning and the sound control. Over concrete we use underlay with a vapour barrier. In condos we use the acoustic underlay your building’s rules name. Laminate also grows and shrinks with humidity, which in Toronto swings from dry furnace air in winter to humid summers. We leave the expansion gap the manufacturer specifies at every wall, doorway and pipe, then hide it under baseboard or quarter round.

