Rockwool Building Slab RW5


Acoustic and thermal building slabs – 100 kg/m³ density

Excellent thermal, acoustic and fire insulation.

Suitable for a wide range of general building applications.

Non-combustible – Euroclass A1.

Reduce noise, either by impeding the transmission of sound through an element of the structure or by absorption of sound at the surface.

Made from diabase rock, which is a renewable and plentiful natural resource.

Does not contain gases that have ozone depletion potential (ODP) or global warming potential (GWP).

Thicknesses and Availability:

This Rockwool Range includes the following readily available product thicknesses 25mm, 30mm, 50mm, 75mm and 100mm (some thicknesses may only be available in pallet quantities as they will need to be sourced from the manufacturer before being delivered to site).


Product options


Availability Indicators

Rockwool RW5 is sent out from depots nationwide and is subject to the Local Depot Delivery minimum order levels and delivery charge thresholds.

Reasonable stock levels of popular thicknesses are held at larger depots. Please allow extended lead times where products need ot be sourced from the manufacturer before being delivered to site.

Rockwool reserves the right to change stocked products - while we will do all we can to keep on top of changes, availability and lead times my vary.

  • Generally 1 to 3 working days for delivery
  • Generally 1 to 5 working days for delivery
  • Generally 5 to 10 working days for delivery
  • Special request or made to order item, allow extended lead times. Minimum order levels may apply.
  • Please call to check availability and approximate lead times

Delivery charges will be calculated at check-out. Please visit our Ordering From Us page for further details on minimum order levels and delivery charges. If you have any queries, please do not hesitate to contact me.

Product Application

Thermal and Acoustic Building Slabs

Rockwools versatile RW5 building slabs, with a density of 100 kg/m³, are suitable for use in acoustic, thermal and fire protection applications in partitions, ceilings, floors, and roofs.

Product Make-up

Core: Durable non-combustable stone wool spun from volcanic rock, resin bonded into slabs.

Facings: Unfaced as standard, however, we may be able to supply tissue or foil faced slabs on request, depending on requirements.

Product Properties

Thickness25mm to 100mm 
Slab Length1.2m 
Slab Width0.6m 
Slab EdgeSquare 

Product Performance

Thermal Conductivity0.034 W/mK 
Fire PerformanceClassification A1BS EN 13501-1
Surface Spread of FlameNon-combustable 
Nominal Density100 kg/m³ 
Vapour ResistanceNegligable 

Product Variants

ProductThicknessThermal Resistancekg/m²
Rockwool RW5 25mm25mm0.73 m²K/W2.5 kg/m²
Rockwool RW5 30mm30mm0.88 m²K/W3.00 kg/m²
Rockwool RW5 50mm50mm1.47 m²K/W5.00 kg/m²
Rockwool RW5 75mm75mm2.2 m²K/W7.50 kg/m²
Rockwool RW5 100mm100mm2.94 m²K/W10.00 kg/m²