Rockwool RWA45 Insulation Slab 1200 x 600 x 100mm

Achieve maximum thermal and acoustic insulation with Rockwool RWA45 insulation slabs, supplied in a thick 1200 x 600 x 100mm size. Manufactured from dense stone mineral wool at 45kg/m3, these robust building slabs conform to BS EN 13162:2012 standards for factory-made mineral wool products.

Delivering a thermal conductivity of 0.035 W/m.K, the 100mm slabs provide exceptional heat retention while acting as a highly effective sound absorber in partition walls, ceilings, and intermediate floors. Holding a Euroclass A1 non-combustible rating, they deliver the highest standard of fire protection for building structures.

Designed for general construction use across walls, roofs, and floors, these slabs are easy to friction-fit between framing. Optional facings including black or white tissue and aluminium foil are available on request (subject to production compatibility).

• 1200 x 600 x 100mm dimensions – maximum thickness delivers robust thermal and acoustic isolation
• 45kg/m3 stone mineral wool – dense structure ensures sound absorption and physical stability
• 0.035 W/m.K thermal conductivity – minimizes heat loss across major building envelopes
• Euroclass A1 non-combustible – provides maximum fire resistance and structural safety
• BS EN 13162:2012 compliant – verified to European standards for mineral wool building slabs
• Universal building application – ideal for thermal, acoustic, and fire protection in roofs and walls
• Available in various thicknesses – including 25mm, 50mm, and 75mm

Delivery (UK mainland only)

 

Next Day: £5, or FREE over £40

- Order by 9pm Mon-Thu: next working day

- Order Fri to 5pm Sun: Monday

- Order after 5pm Sun: Tuesday

 

Pre-12pm: £10

- Same cut-offs as Next Day above

 

Saturday & Sunday: £10, or £5 over £40, or FREE over £75

- Saturday: order by 6pm Fri

- Sunday: order by 4pm Sat

 

Heavy items (over 30kg)

- Mon-Fri only. Order by 6pm and allow up to two working days

- Order after 6pm Thu: arrives after the weekend

 

Supplier items

- Sent directly by the supplier, so timings vary. Lead times appear on the product page in working days (Mon-Fri)

 

More about delivery 

Next Business Day Collection (eligible items)

- Order by 9pm Mon-Thu: collect next day

- Order after 9pm Thu to 5pm Sun: collect Monday

- Heavy items (over 30kg): allow up to two working days

 

Opening hours

- Weekdays vary by branch: open 6:30am-7am, close 6pm-8pm

- Saturday: 7am-6pm

- Sunday: 9am-4pm

 

Check your local store's hours and that it's open before visiting. Please wait for our text or email before collecting.

 

Holding your order
We'll hold it for 14 days, then automatically refund your original payment method.