FLOORIN Acoustic Impact Rubber Underlay – 3mm, 6mm & 10mm

Improve floor sound insulation with FLOORIN Acoustic Impact Rubber Underlay, a high-performance acoustic rubber underlay designed to reduce impact noise and improve airborne sound insulation within residential and commercial flooring systems.

Available in 3mm, 6mm and 10mm thicknesses, FLOORIN Acoustic Underlay is designed primarily for under-screed applications and can be used with floating screeds, concrete slabs and suitable timber subfloors.

Its dense yet elastic rubber construction helps acoustically isolate the finished floor from the building structure, reducing the transmission of footsteps, impacts and other unwanted noise between rooms and floors.

FLOORIN Acoustic Rubber Underlay also offers high compressive strength and long-term dimensional stability, allowing it to retain its thickness and acoustic properties when subjected to sustained loads.

What Is Acoustic Rubber Underlay?

Acoustic rubber underlay is a dense, resilient material installed within a flooring build-up to reduce the transmission of impact and airborne sound.

Rather than allowing the finished floor or screed to remain rigidly connected to the structural floor beneath, the resilient acoustic layer helps isolate the two elements.

This separation can significantly improve the acoustic performance of the complete floor construction.

FLOORIN Acoustic Rubber Underlay is particularly suited to applications where a combination of sound reduction, load resistance, minimal compression and long-term stability is required.

What Does Acoustic Underlay Reduce?

Flooring systems generally need to address two main types of unwanted sound:

Impact Noise

Impact noise is generated when something physically impacts the floor surface.

Common examples include:

• Footsteps
• Furniture movement
• Objects being dropped
• General movement across a floor
• Impact from everyday activities

The vibration created by these impacts can travel through the floor structure and be heard in rooms below or elsewhere within the building.

FLOORIN Acoustic Underlay provides a resilient layer that helps isolate the floor construction and reduce the transmission of impact sound.

Airborne Sound

Airborne noise includes sound such as:

• Conversations
• Television
• Music
• General household noise
• Office activity

These sound waves can cause floors, walls and other building elements to vibrate, transferring noise between adjoining spaces.

A correctly designed acoustic flooring system incorporating FLOORIN rubber underlay can help improve airborne sound insulation as part of the overall floor construction.

Where Is FLOORIN Acoustic Rubber Underlay Used?

FLOORIN Acoustic Impact Rubber Underlay is suitable for a wide variety of residential and commercial flooring applications, including:

• Houses
• Flats and apartments
• Apartment developments
• Offices
• Commercial buildings
• New-build developments
• Refurbishment projects
• Multi-storey buildings
• Under-screed acoustic flooring
• Floating screed systems
• Concrete floor constructions
• Suitable timber subfloors
• Floors incorporating underfloor heating

It is particularly useful where improved acoustic separation between floors is required without compromising the structural stability of the flooring build-up.

Available in 3mm, 6mm and 10mm Thicknesses

FLOORIN Acoustic Rubber Underlay is available in three thickness options, allowing the acoustic layer to be selected according to the available floor build-up and required performance.

FLOORIN 3mm Acoustic Rubber Underlay

The 3mm option provides a low-profile acoustic layer where minimising additional floor height is important.

Roll Size: 1.25m x 10m
Coverage: 12.5m² per roll
Thickness: 3mm
Colour: Black

This thickness is particularly suited to applications requiring acoustic improvement while keeping the overall flooring build-up as low as possible.

FLOORIN 6mm Acoustic Rubber Underlay

The 6mm option provides a balance between acoustic performance and floor build-up, making it a versatile choice for many residential and commercial applications.

Roll Size: 1.25m x 10m
Coverage: 12.5m² per roll
Thickness: 6mm
Colour: Black

For projects where both acoustic performance and finished floor height are important considerations, the 6mm underlay provides a useful middle ground.

FLOORIN 10mm Acoustic Rubber Underlay

The 10mm option provides the highest acoustic performance within the range and is suited to more demanding acoustic flooring specifications.

Roll Size: 1.25m x 6m
Coverage: 7.5m² per roll
Thickness: 10mm
Colour: Black

The 10mm system has tested acoustic performance data available and is the preferred option where maximum sound reduction within the FLOORIN range is required.

FLOORIN Acoustic Underlay Performance

Acoustic performance depends on the complete floor construction, not solely on the thickness of the acoustic underlay.

The following figures provide a guide to the expected performance of the different FLOORIN thicknesses.

3mm Acoustic Underlay – Indicative Performance

• Airborne Sound Insulation: Approximately 44-46 dB
• Impact Sound Insulation: Approximately 38-40 dB
• ΔLw Improvement: Approximately 10-12 dB

Recommended for: Low-profile flooring systems and applications requiring a relatively small acoustic improvement with minimal additional floor build-up.

Important: These figures are indicative estimates based on material behaviour and thickness scaling. They should not be treated as tested or certified acoustic performance values for a specific floor construction.

6mm Acoustic Underlay – Indicative Performance

• Airborne Sound Insulation: Approximately 46-48 dB
• Impact Sound Insulation: Approximately 42-44 dB
• ΔLw Improvement: Approximately 14-16 dB

Recommended for: General residential and commercial applications requiring a balance between acoustic performance and floor build-up.

Important: These figures are indicative estimates based on material behaviour and thickness scaling. They should not be treated as tested or certified acoustic performance values for a specific floor construction.

10mm Acoustic Underlay – Tested Performance

• Airborne Sound Insulation: 49 dB
• Impact Sound Insulation: 46 dB
• ΔLw Improvement: 18 dB

Recommended for: Higher-performance acoustic flooring systems and projects where maximum sound reduction within the FLOORIN range is required.

Test results relate to the tested floor construction. Actual on-site acoustic performance will depend on the complete flooring system, substrate, junction details and quality of installation.

What Does ΔLw Mean?

ΔLw is a measure of the improvement in impact sound insulation provided by a flooring system or acoustic layer.

It is expressed in decibels (dB).

In simple terms, a higher ΔLw figure generally represents a greater reduction in impact sound transmission within the tested floor construction.

The 10mm FLOORIN Acoustic Rubber Underlay achieves a tested ΔLw improvement of 18 dB within the relevant tested system.

Which FLOORIN Acoustic Underlay Thickness Should I Choose?

The correct thickness depends on the acoustic requirements of the project, available floor build-up and complete flooring specification.

Choose 3mm When:

• Floor build-up needs to be kept to a minimum
• A thin resilient acoustic layer is required
• The project has relatively modest acoustic requirements

Choose 6mm When:

• A balance between thickness and acoustic performance is required
• The project is a general residential or commercial application
• There is sufficient floor build-up for a thicker resilient layer

Choose 10mm When:

• Maximum acoustic performance within the FLOORIN range is required
• Tested acoustic data is important to the specification
• The project has more demanding sound insulation requirements
• The additional floor build-up can be accommodated

For compliance-driven projects, acoustic specifications should always be assessed against the complete proposed floor construction rather than selecting an underlay based solely on thickness.

High Compressive Strength and Long-Term Stability

An acoustic layer installed underneath a screed needs to provide sound isolation without excessive compression under the weight of the flooring above.

FLOORIN Acoustic Rubber Underlay provides high compressive strength with minimal creep, helping the material retain its thickness when subjected to sustained loads.

This long-term stability helps maintain both the physical and acoustic performance of the flooring system throughout its service life.

Suitable for Underfloor Heating

FLOORIN Acoustic Rubber Underlay can be incorporated into suitable flooring systems containing underfloor heating.

The complete flooring and heating system should be designed appropriately to ensure compatibility between the acoustic layer, screed, heating system and final floor covering.

Moisture and Mildew Resistant

The rubber construction provides resistance to moisture and mildew, helping maintain the integrity of the acoustic layer within suitable floor constructions.

This makes FLOORIN a durable alternative to acoustic products that may be more susceptible to deterioration when exposed to moisture.

Elastic Rubber Construction

The high elasticity of the rubber underlay allows it to accommodate movement within the flooring system while maintaining a resilient acoustic separation layer.

Its elastic properties can also help protect and accommodate movement around appropriately designed expansion joints.

FLOORIN Acoustic Rubber Underlay Benefits

• High-performance acoustic rubber underlay
• Reduces impact sound transmission
• Improves airborne sound insulation
• Available in 3mm, 6mm and 10mm
• Tested acoustic data available for the 10mm system
• 18 dB ΔLw improvement for the tested 10mm system
• High compressive strength
• Minimal creep under sustained loads
• Maintains thickness under heavy loading
• Suitable for floating screeds
• Suitable for concrete floor systems
• Suitable for appropriate timber subfloors
• Suitable for underfloor heating systems
• Moisture resistant
• Mildew resistant
• High elasticity
• Helps protect expansion joints
• Easy to handle and install
• Suitable for residential applications
• Suitable for commercial applications
• Zero ODP
• Zero GWP

FLOORIN Acoustic Underlay Technical Specifications

3mm

• Thickness: 3mm
• Roll Width: 1.25m
• Roll Length: 10m
• Coverage Per Roll: 12.5m²
• Colour: Black
• Acoustic Data: Indicative estimates available

6mm

• Thickness: 6mm
• Roll Width: 1.25m
• Roll Length: 10m
• Coverage Per Roll: 12.5m²
• Colour: Black
• Acoustic Data: Indicative estimates available

10mm

• Thickness: 10mm
• Roll Width: 1.25m
• Roll Length: 6m
• Coverage Per Roll: 7.5m²
• Colour: Black
• Airborne Sound Insulation: 49 dB*
• Impact Sound Insulation: 46 dB*
• ΔLw Improvement: 18 dB*

*Acoustic figures relate to the tested system. Performance in a completed building will depend on the entire floor construction and installation.

FLOORIN Acoustic Underlay Installation

FLOORIN Acoustic Rubber Underlay is designed for incorporation beneath suitable:

• Floating screeds
• Concrete slabs
• Timber subfloor systems

Correct acoustic performance relies on maintaining separation between the floating floor and surrounding structural elements.

Care should therefore be taken during installation to prevent rigid connections or acoustic bridges that could allow sound and vibration to bypass the resilient layer.

All joints, edges, penetrations and perimeter details should be completed in accordance with the relevant flooring and acoustic system specification.

Can FLOORIN Acoustic Underlay Be Installed Under Screed?

Yes. FLOORIN Acoustic Rubber Underlay is designed particularly for under-screed acoustic flooring applications.

The resilient rubber layer helps isolate the floating screed from the structural floor beneath, reducing the transmission of impact sound through the building structure.

Does Rubber Underlay Reduce Footstep Noise?

Yes. One of the primary purposes of acoustic rubber underlay is to reduce impact noise such as footsteps.

The resilient rubber layer absorbs and isolates some of the vibration created when the finished floor is impacted, reducing the amount of structure-borne sound transferred into adjoining spaces.

Does Acoustic Underlay Reduce Airborne Noise?

A properly designed acoustic floor construction can improve airborne sound insulation as well as impact sound performance.

However, airborne sound insulation depends on the entire floor construction, including the structural floor, screed, acoustic layer, ceiling and surrounding junction details.

Acoustic underlay should therefore be considered one component of the complete acoustic flooring system.

Is 10mm Acoustic Underlay Better Than 6mm?

Where acoustic performance is the primary consideration, the 10mm FLOORIN Acoustic Rubber Underlay provides the highest performance option within this range.

The 10mm system also has tested acoustic performance data, including an 18 dB ΔLw improvement within the tested construction.

The 6mm product may be more appropriate where overall floor build-up is restricted or where a balance between thickness and acoustic performance is required.

Is 3mm Acoustic Underlay Enough?

The 3mm option is primarily suited to projects where floor build-up needs to be kept low while still introducing a resilient acoustic layer.

Whether it provides sufficient acoustic performance depends entirely on the required specification and complete floor construction.

For projects with defined acoustic performance or regulatory requirements, the complete floor system should be assessed rather than relying on the underlay thickness alone.

Can Acoustic Rubber Underlay Be Used With Underfloor Heating?

Yes. FLOORIN Acoustic Rubber Underlay is suitable for incorporation within appropriate underfloor heating systems.

The complete system should be designed to ensure that the acoustic underlay, heating system, screed and finished flooring are compatible.

How Much FLOORIN Acoustic Underlay Is on a Roll?

The coverage depends on the thickness selected:

• 3mm: 1.25m x 10m = 12.5m² per roll
• 6mm: 1.25m x 10m = 12.5m² per roll
• 10mm: 1.25m x 6m = 7.5m² per roll

A minimum order quantity of 2 rolls applies.

How Many Rolls of Acoustic Underlay Do I Need?

First calculate the total floor area by multiplying the room length by its width.

For example, a floor measuring 6m x 5m has an area of:

6m x 5m = 30m²

For 3mm or 6mm FLOORIN underlay:

30m² ÷ 12.5m² = 2.4 rolls

You would therefore require 3 rolls before making any additional allowance required by the installation specification.

For 10mm FLOORIN underlay:

30m² ÷ 7.5m² = 4 rolls

Always round up to the next complete roll where the calculated requirement is not a whole number.

Does Acoustic Underlay Help With Building Regulations Part E?

Acoustic flooring products can form part of a floor construction designed to meet the sound insulation requirements applicable to a building project.

However, compliance cannot be determined from the underlay alone. Performance depends on the complete floor and ceiling construction, junction details, workmanship and other building elements.

Where Building Regulations Part E or another defined acoustic standard applies, the complete proposed construction should be assessed against the required performance criteria.

Minimum Order Quantity

The minimum order for FLOORIN Acoustic Impact Rubber Underlay is:

2 rolls

The roll coverage varies according to the selected thickness, so please check the required floor area and roll size before ordering.

High-Performance Acoustic Rubber Underlay for Floors

Whether you’re designing an acoustic floor for an apartment, house, office, commercial building, new-build development or refurbishment, FLOORIN Acoustic Impact Rubber Underlay provides a durable resilient layer for reducing unwanted sound transmission.

Available in 3mm, 6mm and 10mm thicknesses, the range provides options for both low-profile installations and more demanding acoustic applications.

With excellent load resistance, minimal creep, moisture resistance and compatibility with suitable floating screeds and underfloor heating systems, FLOORIN provides a practical long-term solution for acoustic floor construction.