Rockwool RWA45 Acoustic Insulation Slabs | 75mm

Rockwool RWA45 75mm slabs are multi purpose stone wool insulation boards used in internal walls, partitions, floors and ceilings to improve acoustic performance and energy efficiency. They help reduce sound transfer between rooms and limit heat loss through the building fabric.

RWA45 is a semi rigid, medium density stone wool slab designed for a wide range of general building applications. Flexi has a flexible edge for friction fitting between studs, and RW3 is a higher density slab typically specified where very high acoustic or fire performance is required.

Yes. RWA45 slabs can be used in both timber and metal stud wall systems, as well as between joists in separating floors and in some ceiling and roof constructions, provided the overall build up matches the relevant system specification.

Rockwool stone wool is non combustible and contributes to fire resistance when installed in tested wall, floor and ceiling systems. RWA45 helps improve both acoustic and fire performance, but the final rating always depends on the complete construction and lining.

Yes. In addition to its excellent acoustic properties, RWA45 provides effective thermal insulation. It helps reduce heat loss through internal and separating walls, floors and roof structures when installed to the correct thickness as part of a compliant build up.

RWA45 slabs can be cut using a sharp insulation knife or a fine toothed saw. Mark the cutting line, cut on a stable surface and wear appropriate personal protective equipment including gloves, long sleeves, eye protection and a suitable dust mask.

No. Rockwool stone wool is inorganic and does not support the growth of mould, fungi or bacteria. It is also rot proof and dimensionally stable, provided it is kept dry within the building structure.

In many stud walls and floor voids, the slabs are simply cut slightly oversize and friction fitted between the studs or joists. This holds them securely in place until the linings are installed. Follow the installation guidance for the particular system you are using.

Yes. RWA45 can be installed between ceiling joists and rafters in some ceiling and pitched roof applications, provided the overall roof construction incorporates any required ventilation and vapour control layers. Always check Rockwool guidance for the specific roof type.

RWA45 slabs are straightforward to handle and cut, so they can be installed by competent DIY users as well as professionals. Always follow the product instructions, wear suitable PPE and ensure that the planned construction meets building regulation requirements.