Rockwool Insulation

Rockwool acoustic insulation is a stone wool insulation material designed to absorb sound within building cavities.

It is commonly installed in walls, floors and ceilings to help reduce airborne noise transmission between adjoining rooms and properties.

Rockwool insulation also provides thermal insulation and can contribute to the fire performance of suitable building constructions.

Rockwool RWA45 and RW3 are both stone wool insulation products, but they have different densities and specifications.

RWA45 has a nominal density of 45 kg/m³ and is widely used for acoustic insulation within wall, floor and ceiling cavities.

RW3 is a higher-density stone wool slab, with a nominal density of 60 kg/m³, making it suitable for selected applications where a denser insulation product is specified.

The best option depends on the construction and its acoustic, thermal and fire-performance requirements.

Both 50mm and 100mm Rockwool insulation can help improve sound insulation when installed within suitable building cavities.

The appropriate thickness depends primarily on the cavity depth and the specified soundproofing system.

A thicker slab may provide additional sound absorption within a suitable cavity, but increasing insulation thickness doesn't automatically guarantee better overall sound insulation.

The supporting construction, plasterboard layers and structural connections also influence acoustic performance.

Yes. Rockwool acoustic insulation can help reduce airborne noise from neighbouring properties when installed within a suitable wall or ceiling soundproofing system.

Its fibrous structure absorbs sound energy within the cavity, helping improve the acoustic performance of the construction.

However, Rockwool insulation alone is unlikely to provide a complete solution to significant noise problems. Additional acoustic boards, membranes or resilient isolation components may be required.

Yes. Suitable Rockwool acoustic insulation slabs can be installed between timber floor joists to help reduce airborne sound transmission between floors.

The insulation should fit the cavity without unnecessary compression or gaps.

For impact noise from footsteps and movement above, additional resilient floor or ceiling components are often required.

Rockwool stone wool insulation is manufactured from non-combustible mineral fibres, and many Rockwool products achieve a Euroclass A1 reaction-to-fire classification.

However, fire classifications and performance requirements should always be checked against the technical documentation for the specific product.

The fire resistance of a wall, floor or ceiling depends on the complete construction rather than the insulation alone.