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Cavity Wall Insulation

Our cavity wall insulation products are suitable for use in both partial fill walls and walls with a residual 10 mm cavity.

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When insulating a cavity wall there are a number of cavity wall insulation types and options. From full fill cavity insulation to partial fill insulation, we have solutions to meet your needs.

Our 'Guide on cavity wall insulation' is a great place to find out more about whether full fill or partial fill is best for your project and what thickness you might need.

On this page you will find:

  • Our cavity insulation options
  • A comparison of the different solutions we offer
  • Useful links to help with your project, including how to find a stockist and standard construction details for junctions. 

Our Cavity Wall Insulation Solutions

Premium performance full fill cavity wall insulation
Featured

Kooltherm K106 Cavity Board

Premium performance full fill cavity wall insulation

Premium performance partial fill cavity wall insulation
Featured

Kooltherm K108 Cavity Board

Premium performance partial fill cavity wall insulation

High performance partial fill cavity wall insulation

Thermawall TW50

High performance partial fill cavity wall insulation

We have 3 different solutions for cavity wall insulation, depending on the design and performance requirements. Scroll down for full comparison table.

Useful links

U-value calculator
Technical Information

U-value Calculator

We provide U-value calculations free-of-charge to show compliance with current Building Regulations, Standards and best practices. 

Types of insulation
Materials

Find your nearest stockist

Our insulation boards are stocked up and down the country. Use the interactive map to find your nearest stockist.

Construction details how it works 3
Thermal Modelling

Standard details and indicative psi-values

Our standard construction details provide psi-value calculations for the use of different Kingspan Insulation products at major junctions.

House Within A House Inside Case Study- 4:3
Homeowner

Homeowners Hub

Whether you're looking to keep your home warmer, cut energy bills, or upgrade your insulation, you'll find clear advice on choosing the right products.

Building Regulations - Further Information

Cavity wall installation

Approved Document B England - Insulation for Masonry Cavity Walls

Find out about the requirements for masonry cavity walls in Approved Document B England.

Knowledge Article5 min read
Cavity wall

Approved Document B Wales - Insulation for Masonry Cavity Walls

Find out about the requirements for masonry cavity walls in Approved Document B Wales.

Knowledge Article5 min read
Cavity wall

Technical Handbooks Scotland (Section 2 - Fire) - Masonry Cavity Walls

Find out about the requirements for insulating masonry cavity walls in Technical Handbooks Scotland.

Knowledge Article5 min read

Cavity wall insulation support

Kingspan Technical Services
Technical Information

Technical services

Contact details for technical enquiries relating to insulation boards, cavity closers and membranes for Great Britain.

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Education & Training

Product Awareness Training

Our Product Awareness Training is delivered by dedicated technical experts who provide free onsite training and guidance to your team.

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Education & Training

CPDs & online learning

We have a number of in-person CPDs that can be booked, as well as 'Kingspan Learn' - our online training platform.

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Insulation Boards

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Compare our Cavity Wall Insulation Solutions

Product

Advantages

Kooltherm K106 Cavity Board - full fill with a 10 mm cavity

Rigid insulation with a thermal conductivity of 0.019 W/mK. 

Can be a thinner solution than other commonly used insulants.

Full fill cavity insulation with a 10 mm cavity that resists moisture penetration.

Indicative psi-values and thermally modelled junctions available.

Water-tight, vapour-open polypropylene fleece outer facing protects against moisture penetration.

Kooltherm K108 Cavity Board - partial fill

Rigid insulation with a thermal conductivity of 0.019 W/mK.

Can be a thinner solution than other commonly used insulants.

Clear cavity is maintained - resists moisture penetration.

Indicative psi-values and thermally modelled junctions available.

Low emissivity foil facings significantly increase the thermal resistance of the cavity.

Thermawall TW50 - partial fill

Rigid insulation with a thermal conductivity of 0.022 W/mK.

Clear cavity is maintained - resists moisture penetration.

Indicative psi-values and thermally modelled junctions available.

Low emissivity foil facings significantly increase the thermal resistance of the cavity.

Page updated 10/03/2026

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