The Rockwool RW5 100mm Acoustic Insulation Slab is a top-tier stone wool panel designed for outstanding acoustic, thermal and fire performance. With a substantial thickness of 100 mm, and standard dimensions of 1,200 mm × 600 mm, this pack typically covers ~1.44 m² (2 slabs per pack).
Manufactured with a nominal density of 100 kg/m³ and a thermal conductivity (λD) of 0.034 W/mK, the RW5 is built to handle tough sound-proofing requirements while contributing toward energy-efficient builds. 
The fire classification is Euroclass A1 (non-combustible), giving you peace of mind for compliance in fire-sensitive partitions, ceilings or separating floors. 
This slab excels in acoustic applications — especially where low-frequency or bass noise control is important. Its high density and open-fibre structure mean it absorbs airborne sound and reduces reverberation within cavities, making it a go-to for high-spec residential, commercial or studio use.
Installation is straightforward: semi-rigid slabs cut easily, can be friction-fitted between studs, joists or rafters, and retain shape and thickness over the lifetime of the building. Full cavity-fill is essential to get the performance. 
If you’re specifying for high-performance partitions, separating floors/ceilings, sound-sensitive rooms or refurbishments where depth and specs count — the Rockwool RW5 100 mm slab is your premium solution, trusted by trade and professionals.

Key Features

• Thickness: 100 mm — generous depth for high performance

• Dimensions: 1,200 mm × 600 mm per slab

• Pack coverage: ~1.44 m² (2 slabs)

• Nominal density: ~100 kg/m³ — high density for acoustic strength

• Thermal conductivity: 0.034 W/mK (λD) — strong thermal insulation

• Fire rating: Euroclass A1 (non-combustible) — highest non-combustible standard

• Material: Stone wool (rock mineral wool) — durable, fire safe, water-repellent

• Acoustic performance: Excellent for airborne sound & low frequency control

• Applications: Internal partitions, ceilings, separating floors, sound-sensitive spaces, refurbures/new builds

• Installation: Semi-rigid slabs, easy to trim and insert, high reliability over lifetime

Technical Specifications