Hi I have a 1914 house in the Peak District .
I am currently renovating the house and am looking for advice regarding insulating the ground floor
Half of the ground floor has a concrete screed floor with no insulation under it
The other half is floor boards with a 4 ft void below.
The house is built on bed rock limestone not clay, soil

I am wanting ideas on how I can insulate the ground floor . I do not want to dig out the concrete floor and am looking at products to place on top of the existing screed. Obviously anything added to concrete will result in a step at one point where the back meets the front of the house
Also would it be possible to incorporate under floor heating to both concrete and timber floor?

I was going to insulate under the timber floor with rock wool or similar but am worried about restricting air circulation to the floor joists and causing further problems.

I look forward to hearing your ideas

Regards Kieron

  • Rachel Haynes

    Hello, there are a lot of options out there for retrofit insulated underfloor heating that can be laid above screeds or timber decks. These range from 15mm to 50mm build-ups prior to the floor finish being applied. Using a system that can sit above both timber and screed floors will help keep a constant floor level. One example is this from Nu-heat.


    Obviously the more insulation you can get on top of the screed with more efficient your heating and house will be but this would have to be balanced with how much you can step up the floor from the external level.

    Insulating between timber joists is quite common now with either rigid or flexible insulations This shouldn’t cause any problems with air circulation. Check out the various insulation manufacturer’s websites (Knauf, Celotex, Kingspan) for ideas and methods. You can also integrate the underfloor heating between the joists above a rigid insulation and keep the existing floor level where it is – again look at the Nu-Heat products for ideas.

    Speaking to a good underfloor heating specialist would be a good start to discuss options. If not we are very local to you (Derbyshire and Sheffield) and would be happy to discuss further in more detail if you would like.

    Hope this is of use.

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