Rockwool Cavity Wall Batts

  • Size of boards: 455 x 1200mm
  • Thermal, acoustic and fire performance
  • Cavity wall insulation
  • Non-combustible
  • Superior fit against blockwork
  • Dimensionally stable – no slumping
  • Water repellent
  • Rockwool Cavity Wall Batts are sold per pack

Rockwool Full Fill Cavity Wall Batts

Rockwool cavity wall insulation is a semi-rigid, full-fill insulation solution for external masonry cavity walls and for the thermal insulation and acoustic protection of masonry party walls between dwellings. Offering excellent thermal performance, the Cavity Wall Batts slow the rate of heat transfer, effectively maintaining the thermal comfort of your home while also providing superior sound protection. 

If you’re looking for a cavity wall insulation material with excellent fire safety properties, the Rockwool Cavity Wall Batts are the ideal solution. With fire safety being so topical and of such importance, the Rockwool insulation goes extra lengths to offer complete assurance against the threat of fire. With its ability to withstand temperatures of up to 1,000ºC (1,800ºF), Rockwool insulation helps to effectively contain and prevent the spread of flames. Rockwool Full Fill Cavity Wall Batts are rated as Euroclass A1 completely non-combustible – this is the highest rating that an insulation material can achieve.

When you choose Rockwool for your cavity wall insulation system, you also gain the added benefit of acoustic insulation. The open porous structure of the stone wool means that the Cavity Wall Batts are able to absorb and reduce the impact of sound, enabling homeowners to enjoy a comfortable, quiet internal environment. In highly populated areas or for homes that are within close proximity to a busy road, the benefits of this are unrivalled.

Rockwool Full Fill Cavity Wall Batts are lightweight, easy to handle, quick to cut and provide a close fit against brick and blockwork. The insulation is also completely water repellent, thereby preventing the passage of water from the outer to the inner leaf. 

Technical specification

  • Composition: semi-rigid mineral wool
  • Thermal conductivity: 0.037 W/m2K
  • Reaction to fire: Euroclass A1
  • Size of boards: 455 x 1200mm
  • Density: 38kg/m3
  • Weight: 12.46kg
  • Weight/m2: 3.8kg
  • R-value: 2.7W/m2K
  • Thicknesses available: 50mm, 75mm, 80mm, 100mm, 150mm

Coverage Per Pack

Thickness (mm) Boards per pack m2 per pack
50 12 6.55
75 9 4.91
80 8 4.37
100 6 3.28


Rockwool Cavity Wall Batts should be installed in accordance with the manufacturer’s installation guidelines – these should cover design and all aspects of the application of the insulation. Suitable for installation in new domestic and non-domestic buildings of up to 25m in height. May also be used in buildings over 25 metres where a height restriction waiver has been issued.


Shelf life: please see the manufacturer’s date of expiry. Keep in a dry place, in the original packaging. Avoid excess heat or UV light exposure.


50mm, 75mm, 80mm, 100mm


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