Rockwool RWA45

Rockwool RWA45 is a multi-application insulation solution made up of high-quality resin bonded slabs, used within a variety of general and specific building practices, including floors, walls and Roofs. The Rockwool RWA45 acoustic insulation slab is available in a vast spectrum of thicknesses ranging from 25mm to 120mm and is CE marked to EN 13162.

Product Information:
Rockwool RWA45 insulation slab achieves a lambda value of 0.035 w/mk and is rated A1 Euroclass non-combustible, offering the highest accreditation of fire resistance and outstanding acoustic performance. This is thanks to the structure of the fibres which make the RW slab range the ideal sound absorbers.

*Always Refer Back To The Manufactures Specification Document

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ROCKWOOL RW Slabs can be applied to an array of general building applications for acoustic, thermal and fire protection of partition walls, ceilings, floors and roofs. Available in range of thicknesses and densities from 45 to 140 kg/m3, the slabs can also be black or white tissue faced, or foil faced, to one or both sides (subject to production compatibility). ROCKWOOL RW Slabs conform to: BS EN 13162:2012: Thermal insulation products for buildings. Factory mademineral wool (MW) products.


ROCKWOOL RW slabs can be used for a wide range of applications, which include acoustic and fire insulation for partitions and ceilings, as well as thermal insulation for floors, walls, and roofs.


All Rockwool RW slab products, either un-faced or with an aluminium foil or glass fleece on one or both surfaces, achieve an A1 classification in accordance with BS EN 13501-1 and therefore comply with the requirements of non-combustible materials/products, as defined in all UK and Ireland Building Regulations.

Acoustic performance

ROCKWOOL stone wool products work in two distinct ways to reduce noise, either by impeding the transmission of sound through an element of the structure or by absorption of sound at the surface. The structure of the fibres in ROCKWOOL RW slabs make them ideal for use as a sound absorber.


In England and Wales, Approved Document E requires all internal walls between a bedroom or room containing a WC and another room to have a minimum sound insulation of 40 Rw dB. This applies to new walls built both in dwellings formed by a material change of use and new build extensions of existing dwellings. (For Scotland, the minimum sound insulation requirement is 43 Rw dB).


Specific performance standards are set for airborne sound insulation between spaces by Building Bulletin 93 (December 2014) ‘The Acoustic Design of Schools’. This classifies each room for the purpose of airborne sound insulation by its activity purpose and sets the minimum sound insulation performance standards for each partition.


Similar to schools, the Healthcare Technical Manuals HTM 08-01 (previously HTM 2045) sets standards for privacy according to room type and from this the specific performance requirement for any partition can be obtained. Fire performance requirements for internal partitions Generally, fire performance of partitions will be determined in line with the appropriate Building Regulations.

In certain buildings there may be specific fire performance requirements for partitions separating specific room types, for example in Hospitals where this is set by Firecode HTM 05-02 and Building Bulletin 100 Design for fire safety in schools. ROCKWOOL products also help to improve the fire rating of a partition by limiting the transfer of heat across the cavity.

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