Welcome to Retrofit System Support

SIG Retrofit is a support brand to SIG Distribution, focusing on overseeing and managing the supply of SIG’s branded insulation systems. Formed in 2010, SIG Retrofit has been helping installing companies become accredited to install our industry approved Cavity Wall Insulation systems.

In this time, we have forged a reputation for reliability and credibility, growing our installer network nationwide.

Although referred to as SIG Retrofit, our team also supports a network of approved installers in the installation of Cavity Wall Insulation into the new build market. We can therefore provide you with all the insulation systems you require.

In addition, SIG Distribution’s vast product range provides solutions for all your needs in one place and makes SIG Distribution one of the leading distributors in the construction industry.

Why Choose Us

SIG Retrofit System Support understands the issues that installing companies face when attempting to source approved insulation systems in small quantities. SIG provides end to end support from the supply of systems to training, approval, technical support and product know-how.

We put the installing company first

Whether it is a small quantity or a full lorry load, we can be sure to match your requirements.

Our insulation systems can be delivered exactly where and when you need them, via our fast, flexible and reliable vehicle fleets with purpose built offload facilities where required.

In addition, we can arrange collections from our network of 31 Insulation branches nationwide.

What are the benefits to you?

As system certificate holders for our industry approved insulation systems and an integrated part of the wider SIG network, SIG Retrofit takes away the stress of becoming an approved installer. With local support from our SIG Insulation branches and technical support from our department, you can rely on us to be there every step of the way. The benefits you can expect from working with us are:

  • Competitive Prices

 – From the Buying Power of the UK’s Leading Insulation Distributor

  • Improved Cash-Flow

– Ordering Smaller Quantities with Credit Facilities.

  • Local Account Management

– Local Knowledge with National Coverage

  • Technical Support and Advice

– On Site

– By Telephone or Email

  • Routes to Other Markets

– Retrofit or New Build

– Tender Opportunities

– Product Specification

– Funding Opportunities

– Other Measures

  • Flexible Ordering Options

– Speedy Delivery

– Combined Product Ordering

  • SIG’s Vast Product Range

What To Expect

What happens after you’re approved?

Once you’re approved on one of our systems, SIG Retrofit won’t stop there. Count on us to provide additional support and services, our team not only understands the issues installing companies face but will strive to provide you a solution.

Should you require the services of an installing company in a particular area, then our nationwide network of approved installing companies could help.

  • Technical Support & Monitoring
  • Compliance Support
  • Product Specification
  • U Value Calculations
  • Routes to other markets through SIG’s long standing relationships

Working with Manufacturers

SIG know insulation inside out

SIG pioneered insulation distribution over 60 years ago and have since become the UK’s market leading specialist distributor of Insulation systems and related products to the construction industry. We are actively involved in energy conservation through a number of our business streams and have taken the lead in the drive towards sustainability.

Source all your insulation and drylining needs in one place

SIG Distribution is a division of SIG Plc and is the UK’s leading specialist construction supplier.

Our branches not only supply insulation systems but also a comprehensive range of additional products making our branches the one stop shop for all your insulation and drylining needs.

Offering a range of mineral wool fibre industry approved blown cavity wall insulation systems for new build and retrofit applications:
  • SIG CWI 40 BBA Certificate 11/4834
  • SIG CWI 40 is one of the leading solutions for retrofit cavity wall installations
  • For technical information, please see the SIG Cavity Wall Insulation 40 Installation Manual
  • SIG CWI 34 BBA Certificate 15/5244
  • SIG CWI 34 is specifically designed for new build cavity wall installations
  • For technical information, please see the SIG Cavity Wall Insulation 34 Installation Manual
  • SIG CWI CarbonPlus BBA Certificate 13/5001
  • Specially manufactured for cavities 40mm and above and can also be used in partial fill installations
  • For technical information, please see the SIG Cavity Wall Insulation CarbonPlus Installation Manual
SIG CWI Party Wall
  • SIG CWI Party Wall BBA Certificate 19/5625
  • SIG CWI Party Wall is specifically designed for use in internal separating masonry party walls
  • For technical information, please see the SIG Cavity Wall Insulation Party Wall Installation Manual

SIG Insulation’s product range includes:

  • Loft Insulation
  • Roof Insulation
  • Floor Insulation
  • Draft Proofing
  • Personal Protective Equipment
  • Ventilation

Contact Retrofit


SIG Retrofit, Nunnery Drive, Sheffield, S2 1TA, United Kingdom


0330 123 1811