What Is Rockfloor Insulation?
A Complete Guide to Thickness, Density, Acoustic Performance and How West Sussex Soundproofing Use It
When it comes to soundproofing floors, Rockfloor insulation is one of the most effective products available. Designed to deliver both acoustic and thermal benefits, Rockfloor is a high-density mineral wool floor slab that provides excellent noise control in homes, flats, studios, and commercial spaces.
In this blog, we break down what Rockfloor insulation is, how it works, the available thicknesses and densities, and how specialists like West Sussex Soundproofing Ltd use it as part of high-performance floor soundproofing systems.
What Exactly Is Rockfloor Insulation?
Rockfloor is a rigid, high-density stone wool board made for floating floors and separating floor constructions. Unlike softer loft or cavity wool, Rockfloor is firm enough to support flooring systems while still offering powerful acoustic and thermal performance.
It is used in:
- Homes and flats
- Conversions (loft/garage to living spaces)
- Music rooms & studios
- Commercial buildings
- Hotels & student accommodation
- Any place where footsteps, voices, or airborne noise travel between floors
Because of its rigidity, Rockfloor can sit beneath chipboard, plywood, screed or other floor finishes without compressing—making it ideal for noise reduction.
Thickness Options
Rockfloor insulation is typically available in several thicknesses to suit different construction types and performance requirements.
Common thicknesses include:
- 20mm – Often used where floor height is limited
- 25mm – A popular balance of performance and practicality
- 30–40mm – Increased absorption and better airborne sound reduction
- 50mm and above – For high-performance acoustic floors, studios or where Building Regulations require enhanced sound insulation
West Sussex Soundproofing select thickness based on:
- The type of noise problem (impact vs airborne)
- The existing floor structure
- How much height can be sacrificed
- Required regulatory performance (for conversions or separating floors)
Density and Why It Matters
One of the key features of Rockfloor is its high density, typically in the region of:
- 100–150 kg/m³ for general acoustic flooring
- Upwards of 140 kg/m³ for high-performance systems
High-density mineral wool performs better acoustically because:
- It absorbs airborne sound like speech, TV noise, and music.
- It reduces impact noise such as footsteps and dropped items by dissipating vibration.
- It does not compress under load, preserving the integrity of the acoustic system.
West Sussex Soundproofing often combine Rockfloor’s density with floating floor decks, acoustic membranes, or resilient layers to significantly improve both airborne and impact sound control.
Acoustic Performance
Rockfloor insulation plays a major role in improving:
Impact Sound Reduction
This includes footfall noise, chairs moving, and low-frequency structural vibration. When integrated into a floating floor system, Rockfloor can help achieve dramatic reductions in impact noise transmission.
Airborne Sound Reduction
Rockfloor improves airborne sound performance by absorbing sound energy between floors. This is especially useful in flats or terraced homes where voices, TV, or music are heard from above or below.
Real-World Benefits Include:
- Noticeably quieter footsteps
- Reduced bass and mid-frequency transfer
- Less echo or resonance in hard-floored rooms
- Improved comfort and privacy
- Better compliance with approved standards in conversions
It is particularly effective when paired with resilient bars, acoustic plasterboard and proper perimeter sealing—methods used regularly by West Sussex Soundproofing.
How West Sussex Soundproofing Use Rockfloor Insulation
As floor soundproofing specialists, West Sussex Soundproofing Ltd integrate Rockfloor into a variety of tailored systems depending on the building type and noise issue.
Their typical installation process may include:
- Assessing the existing floor (timber joists, concrete slab, suspended floorboards, etc.)
- Selecting the correct thickness and density of Rockfloor for your property
- Fitting Rockfloor into a floating floor system beneath chipboard or acoustic decking
- Adding optional layers such as acoustic mats, membranes, or resilient floor bars for further improvement
- Sealing all perimeters and junctions to prevent sound leaks
- Finishing the new floor ready for carpets, laminate, or hardwood
This combination approach ensures the insulation performs to its full potential, making your home noticeably quieter and more comfortable.
Is Rockfloor Right for Your Home?
Rockfloor insulation is ideal if you want to:
- Reduce noise between floors
- Improve thermal insulation at the same time
- Meet Building Regulation standards for conversion projects
- Install a floating floor without too much floor height increase
- Upgrade for improved privacy in flats, studios or rented spaces
If you live in the region and need help deciding on thickness, density, or a complete acoustic floor system, West Sussex Soundproofing Ltd offer expert guidance and professional installation.
Rockfloor insulation is one of the most effective ways to control both airborne and impact noise between floors. With multiple thicknesses, high densities, and impressive acoustic absorption, it forms a crucial part of modern soundproofing design.
When integrated into a complete flooring system by specialists like West Sussex Soundproofing, the results can be transformative—giving you a quieter, more peaceful home.
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