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Soffit Insulation

Soffit Insulation

We offer a range of slim insulation solutions to maximise space for your soffit construction

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When insulating a structural ceiling (soffit), there are a number of insulation types and options. From thin insulation boards to maximise space, to Euroclass A1 rated mineral fibre, we have solutions to meet your needs.

On this page you will find:

  • Our soffit insulation options
  • A comparison of the different solutions we offer - scroll down the page for a full comparison table
  • Useful links to help with your project

Our soffit insulation solutions

Premium performance soffit insulation

Kooltherm K110 Soffit Board

Premium performance soffit insulation

Premium performance soffit insulation

Kooltherm K110 PLUS Soffit Board

Premium performance soffit insulation

Microporous silica-based insulation for rainscreen & soffit applications
Featured

AlphaCore Pad

Microporous silica-based insulation for rainscreen & soffit applications

Rock mineral fibre soffit insulation

K-Roc Soffit Slab

Rock mineral fibre soffit insulation

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

Where to buy our products

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

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Insulation Boards

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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.

Find out more about soffits

Soffit installation

Approved Document B England - Soffit Insulation

Find out about the requirements for soffit insulation in Approved Document B England.

Knowledge Article5 min read
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Beaufort House

A 1950’s office building has been transformed into a luxury apartment complex

Case Study4 min read
How to Insulate Soffits

How to insulate soffits

Some of the key points to consider when selecting soffit insulation

Knowledge Article5 min read
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Beechwood West

Find out about a new build estate of bespoke modular houses

Case Study4 min read
Soffit installation

Approved Document B Wales - Soffit Insulation

Find out about the guidance for soffit insulation in Approved Document B Wales.

Knowledge Article5 min read
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National College for High Speed Rail

A new special education and training college dedicated to the future of the UK’s rail industry

Case Study6 min read
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AVCP – What does it mean?

In this article we will look at what AVCP is and the different systems (levels) of AVCP.

Knowledge Article5 min read

Soffit 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.

Compare soffit insulation solutions

Material

Advantages

Products

Microporous silica-based insulation

Suited to applications needing both thermal and fire performance in one solution

Problem solver for areas of a building that require a thinner solution

AlphaCore Pad

Phenolic

Thermal conductivity of 0.019 W/mK - can help to create a thin soffit construction

Quick and easy to install compared to some other commonly used insulants

Kooltherm K110

Kooltherm K110 PLUS - manufactured with an outer (exposed) facing of a 6 mm A1 Euroclass building board

Rock mineral fibre

A1 Euroclass

K-Roc Soffit Slab

Page updated 11/07/2025

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