Cavity Wall Insulation

House Wrapped have access to UK government ECO funding grants which allows us to deliver 100% funded cavity wall insulation to any property which qualifies.

Simply fill in our very quick and easy online enquiry form and we will then contact you to arrange a free home survey.

If you would prefer to know more about our materials, processes, installers and installation times etc. first, just read below.

Supafil 40 Cavity Wall Insulation Technical Data

Please Click Here to read the Knauf Supafil 40 datasheet.

Cavity Wall Heat Loss

Insulating the cavity space in your walls will help you to reduce heat loss and lower your home energy bills more than any other measure. On average a house will lose 35% of its heat through external walls if they are not insulated. This makes it an obvious choice, especially when you consider you can have it done for free through the UK Government's ECO (Energy Company Obligation) funding grant.

Installation Process

A series of small holes (approximately the size of a 10p piece) are drilled through the mortar joints of the outer wall in a pattern which is recommended by the insulation manufacturer. A high performance blown glass mineral wool insulating product (Supafil 40) is then applied via an injection process ensuring that the whole cavity is fully filled.

The pattern of the drilled holes and the amount of pressure applied on application ensures that the insulation product is at the correct density throughout the whole cavity.

On completion the installers will fill all drilled holes and use mortar to match your current mortar colour.

Average Installation Times

Assuming no complications are encountered, such as access complications, approximate times as follows :

Mid Terrace - 1 1/2 hours.
3 Bed Semi Detached - 3 hours.
5 Bed Detached - 4 hours.

Supafil 40 Cavity Wall Insulation

The Supafil 40 cavity wall insulation product is non-combustible and has a very low thermal conductivity value, making it ideal for keeping the heat in your home. It has been approved by the British Board of Agrement (BBA) and complies will all current building regulations for England, Wales, Scotland and Northern Ireland.

The British Board of Agrément tested the Supafil 40 Cavity Wall Insulation product and proved that it will not transmit moisture to the inner leaf of the cavity. Furthermore, independent research for the Energy Saving Trust confirmed that the Supafil insulation product does not add to the risk of water penetration.

All work carried out by our accredited and experienced installers is spot checked by company inspectors, manufacturers and utility companies to ensure all installations meet industry set guidelines.

All work is guaranteed by the Cavity Insulation Guarantee Agency (CIGA) which will cover the work for 25 years. Your CIGA guarantee certificate will be sent direct to you in the post.

Benefits of Cavity Wall Insulation

  • British Board of Agrement approved
  • Reduced heat loss plus cooler in summer
  • Lower energy bills, save up to £285 per year
  • Increase the value of your property
  • Effective for the lifetime of your house

About Our Installers

All our accredited installers are fully trained and experienced in all areas of cavity wall insulation. They can explain the full process in detail to you on site if required. They also have full liability insurance through our accredited and experienced installers.

  • BBA Accredited (quality standards)
  • CIGA Accredited (cavity wall insulation guarantee)
  • PAS 2030 Accredited (ECO Installers)

Apply for ECO funded cavity wall insulation.


Read more about ECO Funding.

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