Thermal Performance

Combining a good thermal resistance value with exceptional airtightness, cellulose insulation makes a great thermal insulator.

Cellulose insulation has an R-value (thermal resistance) comparable with alternatives such as fibreglass, rockwool, and expanded polystyrene. However, its blown installation method means cellulose insulation tightly packs every corner of a void. This provides superior airtightness when compared to to most other types of insulation. Alternatives are manufactured in rolls, boards, or batts that are practically impossible to fit tightly in awkward spaces. Even tiny gaps leak heat.

Cellulose vs Fibreglass Insulation

In practice, the performance of cellulose insulation significantly exceeds that of fibreglass. Separate studies by the University of Colorado and Wimpey Homes show that cellulose reduces energy costs by around 25%.

Performance of Cellulose Insulation vs Fibreglass


I was sitting at my desk as the insulation went in. I had been struggling to get the temperature in that room above 16°C with the radiator on full. During the course of that day I watched in amazement as my thermometer rose. In the weeks that followed the room retained its heat and I was able to turn the radiator down by two settings and still be very warm.
Helen Taylor
Helen Taylor
Over Bed & Breakfast


About Devana

We are specialist installers of cellulose fibre insulation, installing all over the country from our Cambridgeshire base.

With a wealth of experience covering insulation, building and design; we would love to find out how we can help with your project.

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Devana Insulation Limited 
81A Fred Dannatt Road
IP29 7RD

01638 501069

Retrovive Floor

Retrovive Floor is the only system that can install insulation underneath your traditional suspended wooden ground floor WITHOUT taking up all the floorboards.

Visit our Retrovive Floor website for details.