Rockwool RWA45 100mm Slab Mineral Wool Insulation

Rockwool RWA45 100mm is an insulation slab, suitable for thermal and acoustic insulation properties within stud partitions, floors, walls, ceilings & roofs. The product features an A1 combustion rating, 0.035 W/mK Lambda value and a density of 45kg per/m3. Currently on back order – contact us for a lead time or to discuss alternative options.


100 mm


Covers 0.72m2


£14.81 /

inc VAT


£12.34 /

ex VAT
Actual Area (sq m) 2.88
Total Price £35.55

Product Description

Rockwool RWA45 100mm Slab is an insulation solution designed for a range of building projects, including commercial, domestic and specialist applications.

The product is robust in composition and features excellent acoustic, thermal and fire performance properties.

Rockwool RWA45 slabs can be used for thermal insulation in ceilings, partition walls, floors and roofs.


  • 100mm thickness
  • 4 units per/pack
  • 2.88m2 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 2.88m2
Dimensions 1.2m x 0.6m x 100mm
Thickness 100mm

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