Insulating Old Buildings with Ultra-Thin Wood Fibre (UdiIN2CM)

Find out more about how we approach this building scenario.

What are the problems faced when insulating old buildings?

    1. Greater heat loss and heating costs
    2. Difficulties insulting narrow/small spaces
    3. Condensation and mould growth
    4. Damage to the timber within walls
    5. Problems with wall materials that don’t take and hold a fixing

What is our solution?

UdiIN2CM is a new, high performance insulation designed to massively improve comfort in solid walled historic buildings. The system can reduce heat loss through walls by up to 65% improving levels of comfort and dramatically reducing heating requirement.

What scenarios does UdiIN2CM perform best in?


UdiIN2CM is ideal for use in narrow rooms where space is a premium. The simplicity of bonding the boards to the surface of the wall means it is fast to install and cost effective. 

Made of wood fibre insulation, the boards keep walls dry and prevent interstitial condensation and surface mould growth. UdiIN2CM is very breathable, preventing any issues with damage to timber within walls.

The UdiIN2CM boards are bonded to the walls with a lime based adhesive, requiring no drilled fixings and preventing damage to delicate building fabric. Soft, friable masonry, such as cob, soft brick and slate, can be easily insulated.

What are the alternative, thin/flexible insulation solutions? 


Traditionally, internal insulation requires the mechanical fixing of insulation boards to the interior of a wall. Whilst this can enable the fixing of thick insulation boards, creating high levels of insulation, the walls much be stable enough to take and hold a fixing. With some types of soft stone, earth or soft brickwork this is simply not possible. Using the UdiIN2CM you can simply stick the boards to a levelling plaster applied to the surface.

The board looks very thin – is it a good insulation material?

The Evidence – how well does an ultra-thin, wood fibre insulation board perform?

We always carry out our own experiments on our products to validate manufacturers’ claims – when investigating UdiIN2CM, this is what we’ve found:

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  1. I am trying to insulate a wall in my 400 year old cottage. However this particular wall is an external single skin (4 inch) soft brick that bows and is not flat by any means. Obviously in winter it is extremely cold and warm moisture creates mould on surface. It is build directly on the chalk bedrock and I have inserted a physical DPM along base.
    Question is can I cut your boards at various angles to follow contour of the wall and stick with adhesive, it would have voids behind though. Then a lime render over top.

    • Hi Mike

      Thanks for your question.

      You can cut the UdiIN2CM boards into smaller pieces and bond them to the surface of the wall if you wish. They do need to be fully bonded though and not have voids behind them to perform correctly. Once installed you can apply any sort of lime plaster over the top but we would usually recommend the Baumit RK 70N so that you have good bond strength to the wall and also to the wood fibre board. It is also quite fine so you can achieve a good finish with it.

      Hope that helps.