Glass Mineral Wool - Masonry Party Wall Slab

Masonry Party Wall Slab


Masonry Cavity Walls


Glass Mineral Wool


Masonry Party Wall Slabs are designed for use in masonry separating (party) walls providing a full-fill insulation solution which is installed as walls are being built.

Manufactured to 455mm widths, to suit standard wall tie spacing, Masonry Party Wall Slabs improve the thermal performance of adjoining properties, helping to reduce energy bills. In addition, the excellent sound absorption characteristics ensure improved acoustic performance.


  • Excellent thermal performance, preventing party wall thermal bypass
  • Reduces energy costs
  • Excellent sound absorption characteristics improve the acoustic performance between adjacent properties
  • Non-combustible A1 Euroclass Reaction to Fire classification
  • Manufactured with ECOSE® Technology for improved handling and installation 



Thickness (mm) Length (mm) Width (mm) Product Format Area per Pack (m²) Quantity per Pack Packs per Pallet Area per Pallet (m²) R-Value (m²K/W)
75 1200 455 Un-cut 8.74 16 20 174.72 2.05
100 1200 455 Un-cut 6.55 12 20 131.04 2.75


Eurofins Gold Eurofins Gold
Zero Global Warming Potential Zero Global Warming Potential
A1 Euroclass Fire Rating A1 Euroclass Fire Rating
ECOSE Technology ECOSE Technology
Made in Britain Made in Britain
Red List Free Red List Free


Masonry Party Wall Slab - Product Datasheet
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September 2022


1.4 MB


African Insulation Solutions Guide
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May 2022


42.4 MB


Product Insulation Guide 2019
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June 2019


8.5 MB


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Additional Product Information

ECOSE® Technology

ECOSE® Technology is our revolutionary sustainable bio-based binder used in the manufacture of all of our glass mineral wool products, and the majority of our rock mineral wool products. invented nearly 10 years ago, it is not only unique, but very much central to our sustainability strategy.  Our ECOSE® Technology is present in Masonry Party Wall Slab and is just another key benefit of our products.

ECOSE® Technology has 5 key benefits

  • A natural binder
  • A lower embodied energy
  • Proven durability
  • Optimum indoor air comfort
  • Easy to handle

We care for the people who make our products, the people who use them and the world we all depend on.

Whilst we are dedicated to supplying sustainable high performance insulation solutions for enhanced energy efficiency in buildings, we also continually strive for improvements in our manufacturing and supply chain operations so to improve quality and minimise our impact on the environment. All Knauf Insulation production locations have state-of-the-art manufacturing equipment and meet the highest quality standards as well as they are supported by an ongoing research and development program. All of our products including Masonry Party Wall Slabs are sustainably manufactured.

At Knauf Insulation, we have 7 key sustainability considerations:

  • to conserve natural resources
  • to reduce the evironmental effects of our own processes
  • Treating people fairly, along the supply chain
  • Delivering our products efficiently
  • Building a comfortable and healthy indoor environment
  • Performance reporting
  • Recognition