The principles for achieving satisfactory sound insulation through light-weight, timber-joist floors are similar as for light-weight cavity partitions.
For example, it is possible to isolate the walking surface of a floor from the main structure by inserting a resilient layer between the two.
This is known as a floating floor and acts on the same principle as the resilient rails used on a high-performance acoustic wall.
Similarly, a gypsum plasterboard ceiling can be fixed directly to the timber joists or, for improved airborne and impact sound insulation, it can be isolated from the floor structure above by using resilient mounts.
As with the wall design, a layer of sound absorbing material provided within the main floor cavity is beneficial.
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