Acoustic performance is the most frequently underspecified aspect of commercial gym flooring — and the most expensive to fix after construction. A gym installed above occupied space without adequate acoustic treatment will generate complaints, building control issues, and potentially costly remediation work. This guide explains the testing standards, the key metrics, and how to specify correctly from the outset.
Why Gyms Are Acoustically Demanding
A commercial gym generates two distinct types of noise that affect occupied spaces below:
- Impact sound — the structural transmission of impacts through the floor. Barbell drops, jumping, running, and equipment vibration all generate impact sound. This is the dominant acoustic problem in most gym installations.
- Airborne sound — music, instruction, and general gym noise. This is addressed through wall and ceiling construction, not flooring.
Flooring specification addresses impact sound. Airborne sound requires separate treatment and is outside the scope of this guide.
The Relevant Standard: EN ISO 140-8
Impact sound reduction performance for floor coverings is measured to EN ISO 140-8 (laboratory measurement of the reduction of transmitted impact noise by floor coverings on a standard floor). The result is expressed as ΔLw — the weighted reduction in impact sound level, measured in decibels (dB).
A higher ΔLw value means greater impact sound reduction. The standard floor used for testing is a 140mm reinforced concrete slab — results on other substrates will vary.
Key metric: ΔLw (delta L weighted) — the reduction in impact sound transmission provided by the floor covering, measured in dB. Higher is better. Typical values for commercial gym rubber flooring range from 12dB (thin tile, no underlay) to 28dB (thick tile with acoustic underlay).
UK Building Regulations Requirements
Approved Document E (Resistance to the Passage of Sound) sets the requirements for sound insulation in buildings. The relevant limits for a gym above residential or hotel accommodation are:
| Building Type | Impact Sound Limit (L'nT,w) | What This Means |
|---|---|---|
| Residential (new build) | ≤ 45 dB | The transmitted impact sound level in the room below must not exceed 45dB |
| Hotel rooms | ≤ 48 dB | Slightly less stringent than residential |
| Commercial above commercial | No statutory limit | But lease agreements and planning conditions often impose limits |
The floor covering's ΔLw contribution is one component of the overall acoustic performance. The base floor construction, ceiling treatment, and any floating screed also contribute. A structural engineer or acoustic consultant should model the complete system for compliance-critical projects.
Typical Performance Values for Gym Flooring Systems
The following values are indicative for common commercial gym flooring configurations. Always request the test certificate for the specific product — values vary significantly between manufacturers and between product batches.
| System | Typical ΔLw | Suitable For |
|---|---|---|
| 6mm rubber tile (no underlay) | 8–12 dB | Ground floor only, or commercial above commercial with no acoustic requirement |
| 20mm rubber tile (no underlay) | 14–17 dB | Low-intensity use above commercial space |
| 30mm rubber tile (no underlay) | 17–20 dB | Free-weight zone above commercial space |
| 8mm rubber tile + 8mm acoustic underlay | 20–24 dB | Cardio zone above hotel/residential |
| 30mm rubber tile + 8mm acoustic underlay | 22–27 dB | Free-weight zone above hotel/residential |
| 30mm rubber tile + underlay + floating screed | 28–35 dB | High-intensity use above residential — compliance-critical |
Superstrata Products and Acoustic Performance
The Superstrata range includes Shield, a dedicated acoustic underlay designed to work in combination with Titan, Pulse, and Stride. The combined system has been independently tested to EN ISO 140-8.
| Product Combination | ΔLw (Tested) |
|---|---|
| Titan 30mm alone | 18 dB |
| Titan 30mm + Shield 8mm | 24 dB |
| Pulse 8mm alone | 12 dB |
| Pulse 8mm + Shield 8mm | 20 dB |
Test certificates for all combinations are available via the Technical Library. For projects requiring performance above 24 dB ΔLw, a floating screed system should be modelled with an acoustic consultant.
How to Specify Acoustic Performance
When writing acoustic performance into a gym flooring specification, the following approach is recommended:
1. Define the Requirement
Establish the required ΔLw based on the building type, the occupancy below, and any planning or lease conditions. For compliance-critical projects, commission an acoustic consultant to model the complete floor system.
2. Specify by Tested System
Specify the floor covering system (tile + underlay combination) by reference to the tested configuration. Do not specify the tile and underlay separately and assume the combined performance will be the sum of the individual values — it will not be. The combined system must be tested as a unit.
3. Require the Test Certificate
Always require the EN ISO 140-8 test certificate from an accredited testing laboratory. A manufacturer's claimed ΔLw without a test certificate is not a specification-grade data point.
4. Address the Subfloor
The base floor construction significantly affects acoustic performance. A 140mm concrete slab will perform differently from a 200mm slab or a timber joist floor. Confirm the base floor specification with the structural engineer and model the complete system accordingly.
5. Include Post-Installation Testing
For compliance-critical projects, specify post-installation acoustic testing (field measurement to EN ISO 140-7) as a contract requirement. Laboratory ΔLw values are measured on a standard floor — in-situ performance will differ due to flanking transmission and construction tolerances.
Common Mistakes in Acoustic Specification
- Assuming any rubber tile provides adequate acoustic performance. A 6mm tile provides 8–12 dB ΔLw. This is not sufficient for a gym above residential accommodation.
- Adding ΔLw values from separate products. The combined performance of a tile and underlay system must be tested as a unit. You cannot add the individual values.
- Specifying acoustic performance without addressing flanking transmission. Sound travels through walls, columns, and service penetrations as well as through the floor. Acoustic performance of the floor covering alone will not achieve compliance if flanking paths are not addressed.
- Leaving acoustic specification to the contractor. Acoustic performance should be specified in the tender documents, not left as a contractor's design responsibility. If it is not specified, it will not be delivered.
Getting the Data
Superstrata's Technical Library contains acoustic test reports for all products and system combinations. For projects requiring a complete acoustic assessment, the specification team can provide product data and connect you with acoustic consultants experienced in gym installations.