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  • How solid was the kitchen floor? How much depth did you pull up? How long did it take and what did you learn? I had discounted being able to smash out the concrete ground floor in my 1950s house. It is freezing. I would like to add insulation. I have spent a long time looking for advice and there doesn’t seem to be much that is useful, things like “insulate under the concrete” only work if you don’t already have concrete…

    There are two types of thin insulation that could work for me without smashing the concrete but both are expensive and have other draw backs - aerogel and vacuum panels.

    If I could smash out enough to gain even 50mm then I could probably get 70mm of insulation in and a screed without losing too much head room.

  • here’s some progress photos - tbh can’t remember that much of the process, during-after-before judging by the upload order. Also dug out the hardcore/crush subfloor, as previously there was zero insulation.

    feel like with many of these things, if it’s one-off (ish) DIY, any pains during the process are quickly forgotten - i’d certainly not say ‘i’m not doing THAT again’ for what it’s worth.


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  • Thanks, looks ok. I read some retrofit eco website that said it is often not possible just because old concrete is too hard. I guess next steps are structural engineer and test hole.

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