Concrete floor Issue in Garage

Discussion in 'Builders' Talk' started by P Quinn, Jan 18, 2021.

  1. P Quinn

    P Quinn New Member


    I’m converting our garage to a home office / occasional sleep over with a wall bed and bathroom. We’ve got a concrete slab and DPM (shown on the 1980’s plans but can’t see from two pits I did a while ago).

    I want / need to:

    1. Improve the thermal quality of the floor - BC officer said I could increase the ceiling insulation but don’t want a stone cold floor.
    2. The planners stated as a condition that it must be able to take a cars load in future....I will never use it for car use but don’t want this to slip up any sale down the track.
    3. Want the levels to be raised at an absolute minimum due to external levels.


    1. Level slab, DPM, 25mm EPS insulation. With highest compressive strength, then a thin screed of say 30-40mm.

    2. Get an epoxy floor specialist in and see if they have any thermal solutions.

    Also, should I do the internal studwork first before the floor...

    Many thanks.

  2. jonathanc

    jonathanc Screwfix Select

    Why have the planners said that? Are you not doing this under permitted development rules?
  3. rogerk101

    rogerk101 Screwfix Select

    How will the planners know whether what you put down canNOT be driven on? Put another way, do whatever you want and that's the end of it. No planner will ever visit you to check what you did, and even then, who are they to say that what you did won't support a car?
  4. P Quinn

    P Quinn New Member

    Hi, Afraid not - in a really nimby local authority with loads of Article 4’s...Is there a insulated film that could be put down before the screed levelling and epoxy? Thanks
  5. P Quinn

    P Quinn New Member

    The floor load does not concern me that much, it’s more improving the insulation properties of the floor with the thinnest section / profile. Thanks. Patrick
  6. stevie22

    stevie22 Screwfix Select

    Going to be tricky to get a car in through a window isn't it?
  7. P Quinn

    P Quinn New Member

    Any ideas welcome.
  8. rogerk101

    rogerk101 Screwfix Select

    I bought a trifold door to replace my garage door when I converted my garage to a granny flat. I also insulated my floor with 50mm of PIR, 22mm of chipboard and then tiles. It could easily still pass as a garage to any busy-body that chose to challenge it.
  9. P Quinn

    P Quinn New Member

    Thanks Rogerk101. Will look and see if there is 25mm PIR but trying to calculate the compressive strength / KPa so a car load is proving problematic - I guess going for the highest compressive strength of 250-300 will do the job with a screed above..
  10. rogerk101

    rogerk101 Screwfix Select

    As I said above, no one in the planning department is EVER going to check, and even if they did, how are they to determine compression strengths of insulation. More correctly WHO are they to check? That sort of thing is way beyond their remit ... so much so that it's a joke for them even to mention it as a condition of their approval.
  11. P Quinn

    P Quinn New Member

    Yes-it made be laugh especially as they’ve gone very woke these last 2 years wanting everyone to walk or recycle and imposing a city centre emissions tax.

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