Rockwool Sound Insulation Slab 1200 x 400 x 100mm
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Product Details
These 100mm-thick mineral wool slabs (1200x400mm) absorb airborne noise in walls and floors. Unlike rigid boards, the flexible material fits snugly between studs while remaining fire-resistant. Essential for achieving Part E building regulations in residential conversions
As of August 2026, PriceNailer data confirms that the cheapest price for Rockwool Sound Insulation Slab 1200 x 400 x 100mm is £37.49 from BuildingMaterials.co.uk across 6 suppliers. Prices have decreased by 8.7% over the last 19 months.
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Frequently Asked Questions
What coverage area does one Rockwool Sound Insulation Slab provide?
Each 1200 x 400mm slab covers 0.48 square metres. You'll need approximately 2.08 slabs per square metre of wall or floor area when accounting for standard stud spacing.
Is Rockwool Sound Insulation Slab suitable for Part E building regulations?
Yes, these 100mm mineral wool slabs are specifically designed to help achieve Part E acoustic requirements. They're commonly used in residential conversions and new builds where sound insulation between dwellings is mandatory.
How do you install 100mm Rockwool slabs between timber studs?
Cut the flexible mineral wool slabs slightly oversized using a sharp knife, then friction-fit between studs or joists. The material compresses easily and springs back to fill gaps completely without additional fixings.
What's the difference between Rockwool slabs and rigid acoustic boards?
Rockwool slabs are flexible and compress to fit snugly between framework, while rigid boards are cut to exact size. Slabs typically provide better coverage as they eliminate air gaps that can compromise acoustic performance.
Are Rockwool Sound Insulation Slabs fire-resistant?
Yes, mineral wool slabs are naturally fire-resistant and won't contribute to flame spread. They maintain their insulating properties at high temperatures, making them suitable for fire-rated wall and floor constructions.