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 & Returns

Delivery: This item is delivered to the kerbside or the nearest accessible road point at your property. The driver won't be able to bring it into your property, so please make sure you can move it from there.

Due to courier restrictions, we're unable to deliver this item to the following postcodes:
Scotland: AB10–16, AB21–25, AB30–39, AB41–45, AB51–56, IV1–28, IV30–32, IV36, IV40–56, IV63, KW1–17, PA1–20, PA21–38, PA41–49, PA60–78, PA80, PH1–26, PH30–44, PH49–50
Wales: LD1–8, LL21–49, LL51–78, SA1–20, SA31–48, SA61–73, SY15–25

Returns: As this is a bulky item, unwanted returns incur a £40 collection fee (replacing our standard £9 fee). There is no charge for items that are faulty, damaged or sent in error. To arrange a collection, please contact our Customer Services team.

This item will be delivered directly by our supplier. Lead times are shown on the product and trolley pages and are always advertised in working days (Monday to Friday).

• If your order contains items stocked by us and items that come direct from the supplier, your order will be automatically split and processed accordingly.
• We will pass the details you give us, including delivery details, your email address and your phone number, to the relevant supplier.
• Most of our suppliers can deliver to any UK address. Delivery to remote or offshore postcodes may take a little longer than the advertised lead time. If the supplier cannot deliver to your postcode or we believe your order may take longer, we will try to tell you beforehand.
• Items that come direct from a supplier will be delivered by the courier chosen by the supplier. Where possible, suppliers will update you with delivery information. This may be by email, phone call or text message.
• Items delivered direct from suppliers cannot be returned through a store. You would need to return these items direct to the supplier, unused and in their original packaging, at your expense. You can arrange for most items to be collected by contacting our Customer Services team. A fee of £9* will be taken off your refund. There is no charge for faulty items being collected. *For big and bulky items, additional charges may apply.
• Please note, you cannot return bespoke or made-to-measure items unless they are faulty.