NBS Source
List your products
ROCKWOOL HP Partial Fill Cavity Slabs

Made of renewable stone wool fibres, HP Partial Fill slabs further maximise energy efficiency by knitting together when tightly butt jointed to eliminate gaps. HP Partial Fill Cavity Slab offers a stable and durable solution that will last for the lifetime of the building.

Rockwool HP Partial Fill Cavity Slab is a CE and Key marked product in accordance with BS EN 13162.

Non-combustible, achieving a classification of A1 in accordance with BS EN 13501-1.

Rockwool insulation products do not contain blowing agents with an ozone depletion potential (ODP) or global warming potential (GWP), are CFC-HCFC-HFC free and 97% recyclable. They will not react with metal components or cause loss of plasticiser from PVC cables and pipes.

Rockwool is a ‘breathable’ material with a vapour resistivity similar to air (5.9 MNs/gm). HP Partial Fill Slabs therefore reduce the risk of condensation and allow natural drying out of the wall construction.


  • Robust front-face resists damage.
  • Slabs knit together to eliminate gaps.
  • Maximises thermal performance.
  • Water repellent.
  • Can be used in high-rise buildings.

General information

Uniclass 2015

Pr_25_57_06_56 Mineral wool slab insulationPrimary


F30/12 Partial fill cavity insulation

F30/155 Partial fill cavity insulation

Specification data - Mineral wool slab insulation

Product Reference

ROCKWOOL HP Partial Fill Cavity Slabs

Face size

1200 x 455 mm


50 mm

80 mm

100 mm

120 mm

135 mm

Standard product features


Mineral wool batts (slabs) to BS EN 13162 or Agrément certified.

Thermal Conductivity:

0.034 W/mK.

Reaction to fire class:

Non-combustible (Class A1 to BS EN 13501-1).

Third party certifications
  • 93/2884
Similar products from ROCKWOOL Ltd