Cavity

Product Rockwool Cavity provides a completely reliable and cost effective method of insulating new masonry cavity walls. The lightweight insulation batts considerably reduce heat loss without permitting water transmission from the outer to the inner leaf. The risk of condensation is also reduced and intermittent heating systems will be more effective.

Rockwool insulation for full cavity fill

Advantages

• Agrément certified for all exposure zones
• Act as a cavity barrier
• Water repellent
• Excellent thermal and fire insulation
• Superior fit against blockwor

Rockwool Cavity is 1200mm long and 455mm wide.
Standard thicknesses are 50, 65, 80, 90, 100, 110 and 120 mm.

The product width shown above is suitable for wall ties placed at 450 mm vertical spacing.

Performance and Properties  

Fire Classification
Rockwool Cavity achieves a reaction to fire classification of A1 as defined in EN 13501-1.

Thermal performance
Rockwool Cavity has a thermal conductivity (K value) of 0.037W/mK.

Water resistance
The orientation of the water repellent fibres will prevent water crossing the wall construction. Provided the batts are correctly installed and sound building techniques are applied to the cavity wall construction (see Installation Notes), any water penetrating the outer leaf will drain down the surface of the batts.