Description Rockwool RWA45 25mm Insulation 600x1200mm 11.52m2 The rockwool rwa45 25mm acoustic insulation slab is a lightweight, multi-purpose stone wool slab designed to deliver dependable thermal, acoustic and fire performance across a wide range of internal partitions, floors, ceilings and roofing systems. Each slab measures 1200 mm × 600 mm, and a full pack provides approximately 11.52 m², making it ideal for large-coverage projects where consistent performance and quick installation are essential. Manufactured at a density of around 45 kg/m³, this semi-rigid stone wool insulation offers strong sound absorption properties—helping to reduce airborne noise transfer through stud walls, between rooms, or between different storeys of a building. The 25 mm thickness is perfect for shallow cavities, over-boarding, acoustic upgrades or layered systems where a thinner slab is required without sacrificing performance. With a thermal conductivity of approximately 0.035 W/m·K, the slab also provides effective thermal insulation, helping improve overall building efficiency. As a Euroclass A1 non-combustible material, rockwool rwa45 25mm supports improved fire protection by resisting flame spread and maintaining structural integrity during fire exposure. The slabs are water-repellent, rot-proof and dimensionally stable, ensuring long-term reliability in both new build and refurbishment applications. They can be easily cut with a knife or insulation saw, fitting snugly between studs and joists at standard 600 mm centres to reduce gaps and improve performance. This product is suited for use in: Internal stud walls Partition walls Acoustic linings Intermediate floors Suspended ceilings Timber or metal frame constructions Layered acoustic systems for enhanced soundproofing The rockwool rwa45 25mm slab delivers an excellent balance of acoustic control, fire safety and thermal efficiency in a practical, easy-to-install format—ideal for trades looking for a reliable and cost-effective insulation solution. This product is available in other sizes which can be found here. If you require an extremely high performing, easy to handle multi-application insulation, this product is perfect for the job. If you require a high volume of this product – please contact us for a quote. Contact us today for more information on 0113 204 7303 or contact us here.
