Case Study:

Herefordshire Housing Association

Main Contractor

Merriman Roofing

Project Type

Housing Stock Upgrade

Project Value

Herefordshire Housing Upgrade

The Project

Recently, Herefordshire Housing Association, part of Connexus, announced plans of a five year project with the aim of improving the energy efficiency levels of its entire housing stock, which includes over 500 Cornish type houses across Herefordshire. 

Many of these homes were built between 1946 and the 1960’s as a ‘temporary’ solution to the post-war housing crisis and they are easily recognised because of their distinctive Mansard roof structure. While they were intended to be temporary, these Cornish-type homes are still inhabited by thousands of people across the country. 

Herefordshire Housing Association have invested £3.5 million over 5 years to increase energy efficiency in their existing properties. 

The Problem

The contractors, Merriman Roofing and distributor Encon Insulation were given the target of improving the thermal performance of this insulation in the Mansard roofs to a u-value of 0.30 W/m²K, while minimising the disruption to residents which wouldn’t have been possible using traditional means. 

Because the houses were occupied, all improvement works needed to be carried out from the outside to minimise the impact on the occupants.

Unfortunately, due to the Mansard roof which covers the second storey of the building, it’s difficult to significantly improve the energy efficiency of the homes using traditional materials and tools, with a u-value target of 0.30 W/m2.K, traditional insulation was too thick.

In the past, efforts to improve the insulation of the Cornish-type homes have been limited by the design of the roof. Achieving a good fit within the timber frame using externally applied options has proved to be challenging due to the narrow cavity between the interior wall and the exterior roof and applying products from inside can typically be disruptive and intrusive for occupants.

How We Helped

To overcome this issue, the companies sought our expert advice and services to provide cost-effective insulation which could be quickly and easily applied from the outside of the property and which met their targets for thermal performance.

After visiting the houses that required new insulation, our experts came to the conclusion that our SuperFOIL SF40 multifoil insulation would be the perfect solution to the problem. Because SF40 measures to be just 65mm thick when installed, it was a suitable fit for the unusual Cornish-type properties and their distinctive roofs which only allow a narrow space for insulation. 

Working with, Herefordshire Housing, Encon and Merriman Roofing Contractors Ltd, we have supplied enough insulation to provide for over 500 houses, improving heat retention in the winter and energy efficiency throughout the year. 

SuperFOIL worked very closely with Hereford Housing Ltd and Merriman Roofing Contractors Ltd to offer a bespoke solution. SF40 was up to the challenge achieving 0.26 W/m2.K, significantly exceeding their target value. A single layer of SF40  provided maximum performance, minimal thickness, improved air-tightness, radiant barrier, huge cost savings and less disruption to the residents.

Director of Merriman Roofing, Mike Merriman, said: 

“SuperFOIL’s SF40 multifoil insulation was the only product on the market that could do the job and we’ve used it on every one of the 500 homes to great effect. Using SuperFOIL, we’ve exceeded our target and cut the u-value to just 0.26 W/m²K. 

“The SF40 insulation has been quick and easy to install, enabling us to complete the work with minimal disruption to residents. The upgraded houses should cut residents’ heating bills significantly and they’ll be much more comfortable in their homes over winter. I’m really pleased with the results.”

National Sales Director of Encon Insulation, Steve Clarke said:

‘’Encon were proud to be involved with the Herefordshire Housing contract. SuperFOIL were very helpful in providing calculations to ensure we achieved the correct specification for the contract. 

“It was great to see modern construction materials being used on the traditional Cornish type properties. The products worked well and were easy to install for our customer, Merriman Roofing.

“SuperFOIL were helpful throughout the project and the products performed well.’’

We help 1000's of customers every year

Here are just a few of the comments we've received...

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Loft Conversion

Actually, I bought Superfoil for my small extension and I must say easy to install and it works, room is comfortable better than Kingspan. Now looking at installing an underfloor in my daughter's house. Thanks!

Duncan Walker

Conservatory Conversion

I'm really grateful for all the info you've provided, many thanks. To be honest I didn't think your stuff is as good as it clearly is, and we'll definitely be using it in the future. Can I ask a favour and ask you to calculate two more please?

Carl Bell

Self Build

In the past, I used SF19 for thermal insulation of the roof. I have the best experience. I'm thinking about insulating the house outside wall. As I want to be clear, I will definitely call. Many satisfied customers wish.

Jiri Milfait


We’re delighted with the thermal improvements after fitting Superfoil SF40. The system was clearly and helpfully specified, simple to install and immediately felt warmer, despite this also being the Winter of Beast from the East. It suits our 200 year old house, now heated with a modern, green air source heat pump.

Tim Clements

Senior Building Control Surveyor

Many thanks for all your assistance with this matter, you have been very helpful. The information you have provided has been very useful to one of our customers and I am now more familiar with this type of double fit of SuperFOIL as a suitable method of achieving compliance with The Building Regulations.

Donna Worrell

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