Case Study:

How SuperFOIL Saved This First Floor Balcony

Main Contractor


Project Type


Project Value

First Floor Balcony Insulation

The Project

A project that had been seven years in the planning, the dream to create much-needed space for Darren and his family.

With plans to build a spacious two-storey extension, providing an open plan family kitchen dining area downstairs, with an extra bedroom and dressing area upstairs. It also allowed Darren to build a first floor, sheltered balcony area to enjoy the views from the property.

By building the extension, it allowed for Darren and his family to stay in their much loved family home.

The Problem

A first-floor balcony area with a need for a warm roof due to having an inhabited room below and a required U-value of 0.18. With limited space of 6.3m2, it was important to have a space-saving product. Darren had looked at PIR solutions but with builds ups of 200mm plus, it meant that his balcony would have to have a step up which was a big “no-no!!”.

Darren had previously used SuperFOIL for a stable conversion with good results, so decided to contact the technical team to see how we could help.

How We Helped

After discussion with Darren, a solution was offered that would cut a massive 100mm off his current PIR solutions, which would mean he would achieve the level floor that the project needed.
Darren was offered a solution of 40mm PIR combined with SF40 to give a U-value of 0.17.

Darren stated, “ The technical team got back to me really quickly with calculations for U-value and a solution that meant that my balcony floor level could be achieved…”

SF40 is a multifoil insulation product that is 65mm thick. With an R-value of 3.47 when used in a roof, it was the perfect answer for reducing the thickness of the balcony floor level which was an important factor in this build whilst still meeting that important U-value of 0.18 or less.

With an easy, 3 step installation method, Darren found it simple to use. “I used SuperFOIL SF40 which was really straightforward to lay”.

Dean, one of our technical service specialists reported ” It was important to find Darren the correct build-up for his balcony so that he didn’t need to build a step which is something he didn’t want to do. By combining a mix of SuperFOIL and PIR, it gave the best solution to his issues whilst beating the U-value that he needed to achieve…”

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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