KORE Fill Bonded Bead Cavity Wall Insulation System

Technical | Benefits | Installers | FAQs


KORE Fill is a bonded bead, complete cavity wall insulation system for application in new and existing buildings with a cavity width of at least 40mm.

KORE Fill Cavity Wall Insulation is expanded polystyrene (EPS) injected in bead form into a cavity to form an insulating mass. The cavity wall insulation solidifies in the cavity as it is injected along with a special bonding agent (KORE Fill Glue). KORE Fill significantly reduces thermal transmittance across the cavity.

Filling the cavity with KORE Fill still allows the cavity to perform its function. The cavity is still able to breath, the bead does not absorb water and water will not transfer across the cavity to the inner leaf.




KORE Fill Cavity Wall Insulation System




Many homes across Ireland the UK are built utilsing the cavity wall construction method. Cavity walls are built with an inner and outer leaf (wall) with a gap, or cavity, in between. Cavity walls are typically masonry construction made from concrete block or brick. Cavity wall ties are installed between the two leaves to connect to the walls together. 

Cavity walls are designed so that rain water and moisture do not transfer from the outer leaf to the inner leaf - especially wind-driven rain. Unfortauntely, while cavity wall construction works very well at keeping rain and moisture out, many older homes were built without adequate levels of cavity wall insulation, if any at all.

KORE Fill Bonded Bead Cavity Wall Insulation easily fills cavity walls with a minimum width of at least 40mm (50mm for KORE Fill Diamond). As the insulation is pumped into the cavity from the exterior of the home, disruption to occupants is minimal and installation is completed quickly. 




150mm KORE Fill = 0.21W/m2K


  •  Immediate savings on heating bills
  • Complete insulation fill everytime
  • Excellent thermal properties
  • Specialist insulation installers
  • Suitable for new and existing buildings









KORE Fill offers a complete cavity wall insulation fill every time

KORE Fill Bonded Bead ensures a complete cavity fill for every application, new build or retrofit, utilising the KORE Fill approved drilling pattern relevant to the construction of the building.

KORE Fill will not absorb water or moisture

KORE Fill Bonded Bead is completely water resistant and will not absorb moisture. Any water that penetrates the outer leaf will drain down the cavity without any transfer to the inner leaf. KORE Fill will not retain moisture.

A Nationwide Insulation Installer Network

KORE offers a nationwide KORE Fill Installer network. Every installer is SEAI and NSAI approved to install KORE Fill Bonded Bead along with a wide variety of other insulation and energy efficiency measures.

KORE Fill is installed quickly with minimal disruption

KORE Fill Bonded Bead is installed quickly. Installation times vary from a few hours to a few days, depending on the size of the home, the width of the cavity and local environmental factors. Most retrofit applications can be completed in just a few hours.


KORE Fill begins to work instantly. Occupants should feel a noticeable difference in the building's ability to retain heat during the winter and its ability to stay cool during the summer. The final U-value will depend on the size and construction of the cavity.


KORE Fill is made from expanded polystyrene, a sustainable material. KORE Fill Cavity Wall Insulation will last the entire lifetime of the building and can easily be recycled at the end of the building's useful life. Recycled EPS can be used as insulation or moulded into a variety of other products.




KORE Fill Cavity Wall Insulation is the perfect alternative to PIR insulation for wall applications. The table below shows a comparison between full fill PIR insulation board and KORE Fill Bonded Bead Cavity Wall Insulation. While the table displays a cavity width of 150mm, you can achieve lower U-values by widening the width of the cavity or by combining KORE Thermal Board. 

Material Thermal Conductivity Thickness Required U-Value Achieved

PIR Insulation (Rigid Board)




KORE Fill Original (Bonded Bead)








The KORE Network is a nationwide installer network that is approved and certified to install KORE Fill Bonded Bead Cavity Wall Insulation. Only contractors that have been approved by KORE, SEAI and NSAI may install KORE Fill Bonded Bead in both new build and retrofit applications.


The KORE Network covers every county in Ireland. Find a KORE Approved installer located near you.


Learn more about the KORE Network, including company biographies and the Official Register of KORE Fill Installers.

Official Register of KORE Fill Installers



Download full technical information about KORE Fill Bonded bead by visiting the KORE Resource Centre. Technical documents include the KORE Fill Cavity Wall Insulation Design Guide, sample U-value calculations, condensation risk analysis and construction details. Documents are available in PDF format for immediate download. You may also contact our technical team if you would like to discuss your project in detail or to receive customised U-value calculations.



KORE Fill Cavity Wall Insulation
Design Guide

KORE Fill Cavity Wall Insulation Brochure

KORE Fill Cavity Wall 
Insulation Brochure



Request a Quotation for KORE Fill Cavity Wall Insulation

Request a Quotation