.jpg)
40mm Rockwool RW3 Acoustic Sound Insulation Slab (7.2m2/Pack)
Coverage required
High-density stone wool slab with strong thermal and fire performance and enhanced acoustic properties. Suitable for adding sound reduction to partitions and ceilings without excessive build-up.
Nationwide Delivery
Thu 2 Oct
- 0days
- 4hrs
- 33mins
- 48secs
Learn more
Pay in 3 interest-free payments
Split your purchase of £47.52 into 3 with no sign-up fees or late fees.
£190.08
today
£190.08
1 month
£190.08
2 months
How it works
- Choose PayPal at checkout to pay later with Pay in 3.
- Complete your purchase with the first payment today.
- Remaining payments are taken automatically.
Pay in 3 is a form of credit, so carefully consider whether the purchase is affordable and how you will make the repayments. Be aware of the possible impact of using Pay in 3 and of missing payments, including making other borrowing more difficult or more expensive. Pay in 3 eligibility is subject to status and approval. 18+ UK residents only. Available for purchases of £30 to £2,000. Terms and conditions apply. PayPal Pay in 3 is a trading name of PayPal (Europe) S.à r.l. et Cie, S.C.A. 22-24 Boulevard Royal L-2449, Luxembourg.
Learn more
Buy now. Pay with Klarna at your own pace.
Get what you need for your next project, choose how you pay.
Pay in 30 days
£47.52
Pay in full
Klarna's Pay in 30 days is an unregulated credit agreement. Borrowing more than you can afford or paying late may negatively impact your financial status and ability to obtain credit. 18+, UK residents only. Subject to status. T&Cs and late fees apply.
Pay over time
£190.08
Every 30 days
Pay in 3
£190.08
today
£190.08
in 30 days
£190.08
in 60 days
Klarna's Pay in 3 is an unregulated credit agreement. Borrowing more than you can afford or paying late may negatively impact your financial status and ability to obtain credit. 18+, UK residents only. Subject to status. T&Cs and late fees apply.
How it works
- At checkout select Klarna.
- Choose your payment plan.
- Different payment plans may be shown depending on the purchase amount and credit score.
- Complete your checkout.
- The amount will be charged based on the payment plan you chose.
Learn more
Pay in 4 interest-free payments
Split your purchase of £47.52 into 4 with no sign-up fees or late fees. Your purchase will be split into 4 payments, payable every 2 weeks
£142.56
today
£142.56
second payment
£142.56
third payment
£142.56
fourth payment
How it works
- Choose Clearpay at checkout to pay later with Pay in 4.
- Complete your purchase with the first payment today.
- Remaining payments are taken automatically.
Clearpay is unregulated credit. Use responsibly. 18+, T&Cs and late fees apply at clearpay.co.uk/en-GB
Clearpay lends you a fixed amount of credit so you can pay for your purchase over 4 instalments, due every 2 weeks. Ensure you can make repayments on time. You must be 18+ and a permanent UK resident (excl Channel Islands). Clearpay charges a £6 late fee for each late instalment and a further £6 if it’s still unpaid 7 days later. Late fees are capped at £6 for orders under £24 and the lower of £24 or 25% of the order value for orders over £24. Missed payments may affect your ability to use Clearpay in the future and your details may be passed onto a debt collection agency working on Clearpay’s behalf. Clearpay is credit that is not regulated by the Financial Conduct Authority. T&Cs and other eligibility criteria apply at clearpay.co.uk/terms
Product Overview
High-density stone wool slab with strong thermal and fire performance and enhanced acoustic properties. Suitable for adding sound reduction to partitions and ceilings without excessive build-up.
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}} 60kg/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: | RW3 |
|---|---|
| Material Type: | Rock Mineral |
| Thickness: | 40mm |
| Width: | 600mm |
| Length: | 1200mm |
| Pieces Per Pack: | 10 |
| Sales Unit: | Pack |
| Sales Unit Coverage: | 7.2m2 |
| Brand: | Rockwool |
| Manufacturer's Reference: | 181182 |
| Thermal Conductivity: | 0.034W/mK |
| Density: | 60kg/m3 |
| Fire Rating: | A1 Non-Combustible |
Technical Downloads
Product Overview
Stone wool insulation slab, measuring 40mm in thickness and cut to 1200 × 600mm, for use in partitions, ceilings, and floors.
Manufactured at a density of 60 kg/m³, the slab combines dependable acoustic absorption, effective thermal insulation, and inherent fire resistance.
Its semi-rigid composition ensures straightforward installation, while maintaining a close fit to limit gaps that could compromise performance.
Non-combustible and classified to the highest fire safety standards, the slab contributes to enhanced fire protection within the building fabric. Its fibre structure also provides airborne sound absorption, improving acoustic comfort between rooms and floors.
At 40mm thick, the slab delivers greater acoustic and thermal performance than thinner options, while still offering a relatively slim profile.
It is well suited to applications where space is limited, but improved sound control, energy efficiency, and fire resilience are required.
Features & Benefits
- A1 non-combustible fire rating (BS EN 13501-1): Meets UK and Ireland Building Regulations for non-combustible materials.
- Stone wool material: Naturally resists rot, fungal decay, and insect attack for long-term durability.
- 60kg/m³ density: Provides rigidity for friction fitting and reliable acoustic performance.
- Semi-rigid slab format: Fits neatly between studs, joists, and rafters.
- Open-fibre structure: Provides excellent sound absorption for reduced noise transfer.
- Easily cut to size: Allows straightforward installation around services and fixtures.
- Slab size 1200 x 600mm: Standard board dimensions suit common stud spacings.
- 40mm thickness: Adds acoustic performance to partitions and ceilings while keeping overall build-up low.
Applications
- Stud partitions: Enhances sound reduction between rooms, meeting Approved Document E requirements.
- Ceiling upgrades: Improves airborne sound insulation in residential or commercial builds.
- Floor voids: Adds acoustic performance to timber floors, reducing impact and airborne sound.
- Service risers and enclosures: Provides fire and acoustic protection in building services applications.
Installation Guidance
- Friction fit between studs/joists: Ensures slabs stay securely in place without gaps.
- Cut with insulation saw or knife: Achieves accurate fitting around pipes, sockets, and structural details.
- Protect from moisture during install: Maintain insulation performance by keeping slabs dry until enclosed.
Compliance & Performance
- Euroclass A1 non-combustible (BS EN 13501-1): Complies with Building Regulations requirements for non-combustible materials in internal partitions, floors, and ceilings.
- CE marked to BS EN 13162: Factory-made mineral wool insulation, tested for thermal conductivity (0.034 W/mK) and acoustic absorption performance.
