Knauf Earthwool RS45 75mm Slab Mineral Wool Insulation

Knauf Earthwool RS45 75mm Building Slab is a rock mineral wool product, designed for sound absorption and thermal insulation.


75 mm


Covers 0.72m2


£8.72 /

inc VAT


£7.27 /

ex VAT

Out of stock

Product Description

Knauf Earthwool RS45 75mm Building Slab is an acoustic and thermal insulation product, suitable for use in the construction of floors, ceilings, roofs, rafters and partition walls for superior airborne noise control.

The product is resilient, semi-rigid, non-combustable and is manufactured from rock mineral wool.

Earthwool RS45 mineral wool insulation features a 45kg per/m2 density and an Euroclass A1 fire rating. The product is generally used as part of a system because as a standalone solution, it will only reduce background noise. For retrofit applications, there could be other options which offer a more substantial reduction with less intrusive installation methods, for example when requiring an airborne reduction on an existing floor, wall or ceiling.

  • 75mm thickness
  • 6 units per/pack
  • 4.32m2 pack size
  • Available in 600mm width
  • Superior sound absorption
  • A1 non-combustable performance classification
  • Weight 45kg per/m3
  • Ideal for between floor joists, ceilings, partition walls and roofs.
  • 0.035 W/mK Lambda value

Technical Specification

Area 4.32m2
Dimensions 1.2m x 0.6m x 75mm
Thickness 75mm

The information given here may vary and is partly based on information from our suppliers. It represents the prevailing level of expertise and is not binding in a legal sense. The compliance of legal requirements lies within the customers own responsibility.

You can find all of the information shown here on one of our product data sheets which are in a PDF format. You can download this below.

Technical Data Sheet
Product Data Sheet


On average, this item takes 2 to 3 working days to be delivered to a UK Mainland address.

Our delivery rates are calculated on an order value basis. All standard deliveries are delivered by couriers (company variable) and can be received up to 3 to 5 working days from order (6 working days if you order after 12.30pm on a weekday).

All available delivery options for this item can be selected at the check-out and if you order before 12pm Monday to Friday, your order will be processed the same day.

Need it quickly?

We may be able to deliver this item on a next day service, please contact us to arrange this prior to ordering.


You should never book fitters before you have received your goods, we cannot be held responsible for costs incurred by yourself as a result of delivery complications and/or delays.

Deliveries are palletised and heavy, therefore our delivery services are to kerb-side only – you will be responsible for moving the goods from the roadside to the property.

Shortly after placing your order, you will receive a delivery date confirmation email. This email will detail the day of delivery which can take place any time between 8am and 6pm. If you require a more accurate time slot, please contact us prior to ordering and we’ll do our best to assist you; this could be at an additional cost.

For full delivery details, including timescales and Terms & Conditions, please click here