There are many different ways to acoustically treat a timber floor, but one should always consider that without exception all test performance results (advertised flooring product by suppliers) will be the performance across the entire floor construction including the ceiling and the floor treatment.
There are other factors that heavily influence the outcome of a successful acoustic floor treatment such as the depth of the floor void, span of the joists and even the surrounding wall construction. It is for this reason that Isomass Ltd offer a free advice/design service, because we recognise that the average home owner/occupier could not hope to recognise or appreciate what impact any small change in the detail could have to the acoustic performance of a party or partition floor.
Many of you will not need to carry out any testing because you are contemplating an upgrade of an existing floor structure in your home, but you will still no-doubt rely on test performance data during the product selection process. It is this performance data that few people fully understand and consequently are comparing the performance data without appreciating what the sequence of letters that follows the dB rating means.
So when an acoustic product is accredited with an airborne test performance it should appear as a Dntw+Ctr, Dntw or even an Rw. These measurements exist to qualify how floors will perform and the same floor measured as a laboratory-rated performance (Rw) compared to on-site (DnT,w), will range between 8-10 dB even though it is still the same product.
Acoustic floors will also be accredited with an impact performance because unlike wall systems it will receive footfall.