Rockwool RW3 Acoustic Insulation Slabs | 100mm

Rockwool RW3 100mm slabs are high density stone wool insulation products used in internal and separating walls, partitions, floors and ceilings where enhanced acoustic performance is required. They also contribute to fire resistance and thermal insulation.

RW3 is a higher density, rigid slab designed for robust acoustic performance and use in a wide range of partition and ceiling systems. Flexi has a flexible edge for friction fitting between studs, while RW3 is generally used where a denser, more rigid slab is specified by the system designer.

Yes. Because of its density and fibrous stone wool structure, RW3 is often used in high performance acoustic applications, including music rooms, studios and cinemas, as part of properly designed multi-layer wall and ceiling systems.

Rockwool RW3 is manufactured from non-combustible stone wool and contributes significantly to the fire resistance of tested wall and floor constructions. Always refer to Rockwool fire test data and building regulations to ensure the complete system meets the required fire ratings.

Yes. RW3 slabs can be installed in both timber and metal stud partitions, as well as in suspended ceiling systems and some floor build-ups, where the specified density and thickness match the system requirements.

Cut RW3 slabs with a sharp insulation knife or fine-toothed saw on a stable surface. Wear gloves, long sleeves, safety glasses and a suitable dust mask to minimise irritation from fibres during cutting and installation.

Rockwool stone wool is water repellent and does not support mould growth, but it should still be kept dry during storage and installation. The surrounding construction should be designed to prevent ongoing water ingress and allow any incidental moisture to dry out.

In many stud partitions, RW3 slabs are held in place by a close fit between studs and the lining boards. In some ceiling or soffit applications, additional mechanical fixings or support may be specified. Follow the installation details for the specific system you are building.

Yes. RW3 is often used in combination with other insulation layers or acoustic membranes as part of high performance systems. Always ensure that the overall build-up is compatible, meets condensation risk requirements and complies with the relevant standards.

RW3 can be installed by competent DIYers, especially in simple stud walls or ceiling voids. However, for demanding acoustic targets or fire-rated partitions, it is best to follow a tested system design and, where necessary, seek professional advice to ensure performance requirements are met.