40mm Rockwool RWA45 Acoustic Sound Insulation Slab (8.64m2/Pack)
| 8+ packs | 15+ packs | 30+ packs |
| £32.34ex. VAT | £32.01ex. VAT | £31.02ex. VAT |
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- Choose Clearpay at checkout to pay later with Pay in 4.
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Delivery & Returns Information
How Our Delivery Works
We work with a nationwide network of trusted suppliers. As a result, items in your basket may be supplied by different suppliers and delivered separately. Where this applies, you'll see multiple delivery charges at checkout. We always aim to group products from the same supplier to keep delivery costs as low as possible.
Delivery Areas & Charges
Delivery charges listed on our website apply to mainland UK, excluding the following postcode areas: AB, CF, DD, DG, FK, KW, IV, LA, LD, LL, NP, PA, PH, SA, SY
If your delivery address falls within one of these postcode areas, we’ll be in touch before processing your order to confirm any additional delivery costs.
Please note: We do not currently offer delivery outside the UK mainland.
Standard (Nationwide) Delivery
| Insulation, Plasterboard and Drylining Products | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £350 | £35 ex. VAT |
| Over £350 ex. VAT | FREE |
| Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 | £10 ex. VAT |
| Over £300 ex. VAT | FREE |
| Screws & Fixings and Adhesives & Sealants | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £50 | £5 ex. VAT |
| Over £50 ex. VAT | FREE |
Express Delivery
| Express Delivery - Insulation and Plasterboard & Drylining | |
|---|---|
| ORDER VALUE | DELIVERY CHARGE |
| Under £400 | £50 ex. VAT |
| Over £400 ex. VAT | £35 ex. VAT |
| Express Delivery - Timber & Sheet, Building Materials, Joinery and Gardens & Landscaping Products | |
| ORDER VALUE | DELIVERY CHARGE |
| Under £300 | £50 ex. VAT |
| Over £300 ex. VAT | £35 ex. VAT |
Returns
We offer a 30 day returns policy on any faulty products.
Key Features
- {{home}} Use in ceilings, walls and floors
- {{local_fire_department}} A1 non-combustible
- {{density_medium}} 45kg/m3 density
- {{volume_off}} Excellent acoustic and thermal performance
- {{build}} 600mm width to fit between studwork
- {{public}} Zero Ozone Depletion Potential (ODP)
Technical Specification
| Product: | RWA45 |
|---|---|
| Material Type: | Rock Mineral |
| Thickness: | 40mm |
| Width: | 600mm |
| Length: | 1200mm |
| Pieces Per Pack: | 12 |
| Sales Unit: | Pack |
| Sales Unit Coverage: | 8.64m2 |
| Brand: | Rockwool |
| Manufacturer's Reference: | 181175 |
| Thermal Conductivity: | 0.035W/mK |
| Density: | 45kg/m3 |
| Fire Rating: | A1 Non-Combustible |
Technical Downloads
Product Overview
Stone wool insulation slab, measuring 40mm in thickness, designed for use in internal partitions, floors, and roof applications.
Manufactured from high-density stone wool, the slab combines excellent acoustic absorption with reliable thermal insulation and inherent fire resistance.
Its rigid composition allows a close friction fit between studs or joists, preventing gaps that could compromise performance.
Non-combustible and classified as Euroclass A1, the slab contributes to improved fire safety within the building fabric. Its fibre structure also provides effective sound reduction, limiting noise transfer between rooms and floors.
At 40mm thick, the slab offers a balance between minimal wall build-up and meaningful acoustic performance.
It is often specified in partitions, linings, and ceiling systems where space is limited but higher sound absorption is required than thinner slabs can deliver.
Features & Benefits
- Euroclass A1 fire classification: Non-combustible in accordance with BS EN 13501-1.
- Stone wool mineral slab: Naturally resistant to rot, fungal decay, and insect attack.
- Square-cut edges: Butt together cleanly for continuous insulation layers.
- Porous fibre structure: Absorbs sound energy, reducing noise transfer through walls and floors.
- Semi-rigid slab: Simple to shape with a knife and friction-fit between studs or joists.
- Thermal conductivity 0.035 W/m·K: Helps maintain building energy efficiency.
- Sustainable manufacture: Made from natural volcanic rock, recyclable, zero ODP/GWP.
- 40mm thickness: Balanced choice for partitions needing acoustic insulation.
Applications
- Timber or metal stud partitions: Balances sound insulation and thermal resistance.
- Intermediate floors: Improves acoustic separation between levels.
- Ceilings below living spaces: Adds dependable sound reduction.
- Drylined internal walls: Enhances overall performance of partitions.
Installation Guidance
- Cut accurately with knife or insulation saw: Ensures a close friction fit.
- Fit slabs snugly with no gaps: Maintains fire and acoustic integrity.
- Wear gloves and protective clothing: Prevents irritation from mineral fibres.
Compliance & Performance
- Thermal conductivity: Declared 0.035 W/m·K (EN 13162).
- Fire performance: Euroclass A1 non-combustible (BS EN 13501-1).
- Certification: CE and Key marked to BS EN 13162:2012 + A1:2015.
- Acoustic standards: Supports compliance with Approved Document E (England & Wales), Section 5 (Scotland), and BB93 (schools).
- Marine/offshore certification: Lloyd’s Register approved as non-combustible.
