Rock mineral wool
Denser slab or roll made of rock fibre.
- Where it is used: Sound and fire partitions.
- Watch out: If there is dust, wear an FFP1 mask.
Brands and types in the UK (4)
Rockwool RWA45 100mm Insulation Slab 1200 x 600mm
Rockwool RWA45 slabs provide thermal, acoustic and fire insulation in walls, floors and roofs.
Technical data
- Thickness: 100mm
- Coverage: 2.88m²
- Thermal conductivity: 0.035W/mK
- European Fire Classification of A1
- Length: 1200mm
Source: Builder Depot
Rockwool Sound Insulation Slab 100mm 1200 x 600mm
Rockwool sound insulation slabs reduce noise in internal walls and floors, absorbing and trapping sound waves.
Technical data
- Non-combustible: Euroclass A1
- Thickness: 100mm
- Coverage per pack: 4.32m²
- Airborne sound insulation (RW dB): 40
- Slabs per pack: 6
Source: Builder Depot
Rockwool Flexi 100mm Insulation Slab 1200 x 400mm
Rockwool Flexi is a multi-use thermal and acoustic insulation slab with a flexible edge for a perfect fit.
Technical data
- Thickness: 100mm
- Size: 400mm x 1200mm
- Pack Size: 6
- Thermal conductivity: 0.038W/mK
- Non-combustible (Euroclass A1)
Source: Builder Depot
Rockwool RW3 100mm Insulation Slab 1200 x 600mm
Rockwool RW3 slabs provide acoustic, thermal and fire protection for partition walls, ceilings, floors and roofs.
Technical data
- Thermal conductivity: 0.034W/mK
- Size: 600mm x 1200mm x 100mm
- Pack Size: 4
- European Fire Classification of A1
- Thickness: 100mm
Source: Builder Depot
Sources: product listings from Builder Depot, checked on 31-10-2026. Photos are from Builder Depot (with permission) the manufacturer or the shop (shown under each photo); where there is no photo we show a drawing. Original Fixiz Academy text; data can change, always check the manufacturer data sheet.