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ROCKWOOL® HP Partial Fill Cavity Slabs - Insulation

Verified by manufacturer 5 months ago

50 mm

ROCKWOOL Ltd Variant:

Robust, long-lasting protection for masonry cavity walls.

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+44 (0)1656 862621 Website


Partial fill insulation for masonry cavity walls.


Did you know...

ROCKWOOL have launched a new cavity wall insulation product with a thermal conductivity of 0.032 W/mK.

NyRock Cavity Slab 032 is the lowest lambda stone wool insulation currently available in the UK and Ireland.

BBA certified for both full and partial fill applications.

Check out its NBS specification for more details.

NyRock® Cavity Slab 032 - Masonry Cavity Wall Insulation | ROCKWOOL Ltd | NBS Source - the new home of the National BIM Library (thenbs.com)


ROCKWOOL® High Performance Partial Fill Cavity Slabs are a robust and durable solution for the thermal insulation of external masonry cavity walls. High Performance Partial Fill slabs further maximize energy efficiency by knitting together when tightly jointed in order to eliminate performance sapping gaps. The slabs are Euroclass A1 non-combustible and water repellent. Made from abundant, renewable volcanic rock, which is recyclable.

Features and benefits:

  • Euroclass A1 non-combustible.
  • Dual-density slabs (applicable to >90 mm-thick slabs only) - absorb irregularities on the inner leaf and provide a robust outer surface.
  • Water repellent - prevents water transmission from outer to inner leaf.
  • Superior fit against blockwork.
  • Dimensionally stable and robust - preventing slumping and sagging.
  • CE marked to BS EN 13162:2012+A1:2015.
  • BBA certified (certificate number 93/2884).


Approved Document L (2013 edition England and 2014 Wales) – U-value requirements for walls:

  • New build dwellings: England 0.25-0.18 W/m²K / Wales 0.21-0.18 W/m²K.
  • New build non-domestic: England 0.26-0.22 W/m²K / Wales 0.26-0.22 W/m²K.
  • Extensions to dwelling: England 0.28 W/m²K / Wales 0.21 W/m²K.
  • Extensions to non-domestic: England 0.28 W/m²K / Wales 0.26 W/m²K.

General information


Mineral wool

Guidance for specification option:

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




1200 mm


455 mm



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

General requirements

Insulation products generally.


To BS EN 13162; ISO 14001.


50 mm.



Thermal conductivity (maximum)

0.034 W/m·K.

Fire performance

To BS EN 13501-1, Class A1.

Guidance for specification option:

No combustible.


1200 x 455 mm.

Guidance for specification option:

Length x width.


Mineral wool batts.

Guidance for specification option:

To BS EN 13162 or Agrément certified.

Sustainability data

Country of material origin

United Kingdom

Country of product manufacture

United Kingdom


Can be recycled

Manufacturer guidance

ROCKWOOL stone wool insulation is recyclable and can be transformed into new ROCKWOOL products. Please contact us for details of how we can work together to recycle waste ROCKWOOL stone wool material that may be generated during on-site installation.

BIM objects


NBS BIM Object Standard

This BIM object has been authored to meet the requirements of the NBS BIM Object Standard.

Find out more about the NBS BIM Object Standard.

Platform Compatible Version




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