By FencingWise Editorial Team · Updated 3 November 2026.
Locate the sound before selecting a remedy
Record the exact panel, impact location and observed movement before requesting a different fixing or insert. Compare the assembly with an unaffected bay of the same system and identify missing parts, altered contact faces or damage. The supplier needs that evidence to review a compatible replacement; an arbitrary rubber packing strip can change engagement without resolving the underlying fault.
Compare an affected bay with an adjacent bay of the same construction. Differences in fixings, inserts, alignment or damage can help locate the cause.
A designed connection interface can address metal-to-metal movement. Check the proposed inserts and fixings as an assembly; noise-test results from a different setup are not a general noise-reduction promise.
Distinguish mechanical defects from acoustic design questions
| Symptom | First investigation | Possible action after assessment |
|---|---|---|
| One bay rattles markedly | Missing, loose or incorrect connection parts | Restore the approved assembly |
| Sound appeared after repair | Replacement part and installation detail | Correct incompatibility |
| Several sound panels remain noisy | System behaviour under impact | Review suitable sports construction |
| Complaints occur mainly at particular times | Activity and operating pattern | Review management and acoustic assessment |
| Noise is dominated by voices or whistles | Wider site activity | Assess beyond the fence connection |
Do not pack a joint with an arbitrary piece of rubber and assume the job is complete. The insert's dimensions, durability and relationship to the fixing system matter. A change must preserve required clamping and structural performance.
Keep the comparison conditions constant
A before-and-after comparison should record the same ball, impact method, impact position, microphone position and measurement settings. Identify the instrument and its calibration checks.
Also record wind, background activity and surface conditions. A quiet test after the neighbouring road has stopped carrying traffic is not directly comparable with a busy earlier measurement.
For an internal diagnostic exercise, use several repeat impacts at each condition and retain the individual results. The number of impacts and the metric should suit the investigation; a handful of readings is not automatically a planning-compliance test.
If the assessment concerns nearby residents, the receptor positions and evaluation method should be set by the appropriate acoustic specialist. A microphone held beside the panel answers a different question.
Calculate a decibel difference correctly
Assume two comparable measurements of the same sound-level metric are 90 dB and 80 dB. The difference is 10 dB.
It is incorrect to calculate (90 − 80) ÷ 90 = 11.1% and describe that as a noise reduction. Decibels use a logarithmic scale. HSE's noise guidance explains that even a small numerical change can represent a substantial change in exposure.
For comparable mean-square sound-pressure levels, the ratio is:
10^[(80 − 90) ÷ 10] = 0.10.
Under those stated conditions, the lower reading represents one tenth of the mean-square pressure quantity. It does not mean the sound is perceived as exactly 90% quieter, and it does not establish the change in a neighbour's exposure over a whole session.
Average the right quantity
Suppose two equal-duration measurements of a comparable equivalent sound level are 80 dB and 90 dB. Their arithmetic average is 85 dB, but the combined energy-based average is:
10 × log10[(10^(80/10) + 10^(90/10)) ÷ 2] = 87.4 dB approximately.
This example assumes equal durations and compatible measurements. Unequal durations require time weighting. Peak values and maximum levels should not simply be substituted into this calculation.
Keep the original readings, measurement metric and duration in the report. Reporting only one unexplained “average dB” removes information needed to interpret the result.
Repair, repeat and document
After an approved connection correction, repeat the diagnostic comparison under the recorded conditions and identify the replacement parts used. Keep the mechanical finding distinct from any measured acoustic change and from site-level acceptance. For repeat procurement, retain the accepted interface reference so a later batch does not reintroduce the loose contact or incompatible insert.
Record what changed. “Added acoustic material” is insufficient if no one can reproduce its position or identify it for replacement. Include component references and photographs of the interface.
For planning or neighbouring-property questions, use an assessment suitable for the whole activity. Sport England's AGP acoustics guidance addresses assessment methods and practical mitigation for that wider context.
The completed record should distinguish three conclusions: whether a mechanical defect was corrected, what measured change occurred under the test conditions, and whether the relevant site-level requirement was met. These are different findings and should remain separate.