Rockwool Full Fill Cavity Batt 75mm, 9 x 0.455×1.2m = 4.91m²


Full fill cavity wall batts

Excellent thermal, acoustic and fire insulation.

Suitable for new-build and renovations in masonry cavity and party wall applications.

Can be used in domestic and non-domestic buildings up to 25m high.

Prevents water transmission from outer to inner leaf.

Non-combustible – Euroclass A1.

Durable, rot-proof, water resistant and sufficiently stable to remain effective as insulation for the life of the building.

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 50mm, 75mm, 80mm 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).

The following thicknesses are manufactured to order and have minimum order requirements: 120mm (minimum order: 16 x pallets), 130mm (minimum order: 16 x pallets) and 150mm (minimum order: 14 x pallets).

Additional information


1 to 5 working days

SKU: RWLRWCW075 Category:
Product ex-VAT inc-VAT  
Rockwool Full Fill Cavity Batt 75mm, 9 x 0.455×1.2m = 4.91m² £39.03 £46.84

Availability Indicators

Rockwool Full Fill Cavity Batts are 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 via our Contact Form or on 01903 899 898.

Product Application

Thermal batt for Masonry Cavity walls

Rockwools full fill cavity slab, Rockwool Cavity, is suitable for use in masonry cavity wall construction and masonry party walls between dwellings in both new builds and extensions.

Product Make-up

Core: Durable non-combustable stone wool spun from volcanic rock with water repellent additives which prevent moisture transmission.

Product Performance

Thermal Conductivity 0.037 W/mK  
Fire Performance Classification A1 BS EN 13501-1
Surface Spread of Flame Non-combustable  
Nominal Density 33 kg/m³  
Vapour Resistance Negligable