An acoustic test is most useful when everyone agrees what it needs to establish. A booking for “a floor test” leaves too much open: the construction, the measurement and the requirement all need names.
This guide is for an owner arranging a test after installation, or planning one as part of an approval. For the meaning of the numbers, start with acoustic ratings explained.
What should you agree before booking?
Send the acoustic consultant the by-law, written approval and attached conditions. Ask them to identify the measurement and acceptance criterion they will assess, including the test method and qualifications in their proposed scope.
Do not translate a laboratory IIC claim into a field requirement yourself. Nor should an owner select the easiest number from several documents. If the approval and supporting report use different metrics, resolve that difference with the decision-maker and consultant before commissioning work.
Ask for a written scope covering:
- The question the test will answer and the stated criterion.
- The floor areas and receiving rooms proposed for assessment.
- Access arrangements, expected disruption and preparation instructions.
- What the final report will include, and who will explain a disputed result.
If you are still choosing the floor, ask whether a pre-installation assessment or trial would be useful. The AAAC explanatory note distinguishes evidence about a tested construction from certainty about a finished installation.
What happens during the physical test?
For a tapping-machine impact test, a standard machine produces repeated impacts on the floor while sound levels are measured in the receiving room. ASTM’s description of its field method explains that the result includes the floor-ceiling assembly and associated sound paths. The consultant should identify the method required for your brief, rather than assuming every job uses this particular standard.
The machine is a repeatable test source, not an imitation of a particular person’s footsteps. ASTM also cautions that this method does not adequately assess every annoying creak or boom from human footfalls. Describe those symptoms to the consultant so they can recommend any separate investigation needed.
Who needs to provide access?
Ask the consultant which spaces their method requires. An impact test between apartments can involve the floor being assessed and a receiving room below, so speak to the affected owner or occupier before treating a date as confirmed.
Let the consultant specify the room conditions. Do not add temporary rugs or alter the arrangement to improve the result unless those items are expressly part of the construction or conditions being assessed and reported. Tell the consultant about permanent finishes, furniture, unusual background noise and limitations on access.
Arrange entry through the appropriate owner, manager or strata contact. The need for a test does not itself authorise entry into another person’s home.
What information should you keep about the floor?
Provide the exact board, underlay or attached backing, substrate and known ceiling construction. Include installation photographs and any documented variation from the original specification. A product name alone may not establish what was installed.
Make an explicit note of what is unknown. If the ceiling build-up has not been inspected or confirmed, ask the consultant to describe that limitation rather than filling in a plausible specification.
This record helps distinguish a construction that was tested from a different construction proposed elsewhere. It also makes a later change, such as replacing underlay or adding a ceiling, easier to assess.
What should you check in the report?
Read the report identity, date, test locations, method, metric and conditions before the headline number. Then compare the result with the criterion agreed at the outset. The report reader helps organise those details; it does not replace the consultant’s interpretation.
If accreditation is relevant to the brief, check the laboratory’s applicable scope and the report’s endorsement. NATA explains that accreditation and endorsement relate to work within scope. A logo on a brochure is not enough to establish the status of a particular test.
Keep the complete report. A screenshot of the result loses the construction, method and limitations that give the number meaning.
What if the result does not meet the agreed criterion?
Ask the consultant to explain the result and recommend the next investigation. Give the installer the report and an opportunity to inspect the relevant details. Avoid assuming that a thicker underlay, a perimeter repair or a new ceiling is the answer before the cause has been assessed.
If approval conditions set out a process for a failed test, follow that process and seek advice on any disputed obligation. A test result supplies evidence. The approval documents and applicable rules determine what must happen next.
Questions, answered
Does a laboratory report replace a test in my apartment?
It may support an application, but it does not measure your finished apartment. Ask whether the approval accepts laboratory evidence, requires a field test or needs both.
Can I test only the room with the loudest footsteps?
Agree the locations with the consultant and whoever requires the evidence. Do not assume that one room establishes the result for every area.
Does passing mean nobody will hear footsteps?
No. A result addresses the stated metric and criterion under the recorded conditions. It is not a promise that every sound will be inaudible.
Sources
- Apartment acoustic rating explanatory note V2.0 · AAAC · Accessed 2026-09-25
- NATA test reports explained · NATA · Accessed 2026-09-27
- ASTM E1007-25 field measurement of tapping-machine impact sound · ASTM International · Accessed 2026-09-27