Rockwool Sound Insulation Slab 1200 x 600 x 50mm
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Acoustic Rockwool Slab 1200 x 600 x 50mm is a dense stone wool insulation board designed to reduce sound transmission in homes, making it ideal for improving acoustic comfort in walls, floors, and ceilings. Its non-combustible Euroclass A1 fire rating means it also adds fire resistance, withstanding temperatures over 1,000°C. The slab is easy to cut and fit, maintaining its shape for a snug, friction fit between studs, joists, or rafters. Commonly used in home offices, bedrooms, bathrooms, and media rooms, it helps create quieter living spaces. Sometimes called Rockwool Sound Insulation Slab or RWA45 Acoustic Insulation Slab, these names are often used interchangeably depending on the specific product line or application.
As of August 2026, PriceNailer data confirms that the cheapest price for Rockwool Sound Insulation Slab 1200 x 600 x 50mm is £5.89 from B&Q across 6 suppliers. Prices have increased by 0.8% over the last 17 months.
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Frequently Asked Questions
How many Rockwool 1200x600x50mm slabs do I need per square metre?
You need approximately 1.39 slabs per square metre. Each slab covers 0.72m² (1.2m x 0.6m), so for a typical room you'll need to round up to account for cutting and wastage.
Can I use 50mm Rockwool acoustic slabs in stud walls?
Yes, 50mm thick slabs are perfect for standard timber stud walls with 70mm or 100mm studs. The friction-fit design means they compress slightly to fit snugly between 400mm or 600mm stud centres without additional fixings.
What's the difference between RWA45 and standard Rockwool insulation?
RWA45 is specifically designed for acoustic performance with a denser 45kg/m³ composition compared to standard thermal insulation. This higher density provides superior sound absorption and transmission reduction while maintaining excellent fire resistance.
Is Rockwool 50mm thick enough for good soundproofing?
50mm provides good sound absorption for most domestic applications, reducing airborne noise transmission effectively. For maximum acoustic performance in party walls or home cinemas, consider combining with plasterboard systems or using thicker 75-100mm variants.
Do I need protective equipment when installing Rockwool acoustic slabs?
Yes, wear dust masks, gloves, and long sleeves as stone wool fibres can irritate skin and respiratory systems. Ensure good ventilation during installation and vacuum rather than sweep up any loose fibres afterwards.