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General: Insulation under parquet floor

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  1.  
    • CommentAuthorvord
    • CommentTimeNov 28th 2022
     
    I want to lay an oak parquet floor on an existing concrete floor but I first need to raise the floor level by about 18mm to get the finished height right.

    I'm working from a concrete floor from 1920 that once had a much thicker parquet and has the bitumen over much but not all of the surface.

    Is there an opportunity to use the 18mm to insulate a bit, and if so what material could I use?
  2.  
    vord,
    What sort of parquet are you using? the traditional sort that comes in a collection of small bits and put together like a jigsaw or engineered wood that is in planks?
    If the former then you could put insulation - ply /osb sheets - parquet. I would fix the ply / OSB to battens with insaulation between. The depth of insulation and battens will depend upon the space available. Use 100 grade EPS.
    If the latter then insulation then fit the engineered wood as a loose layed floor, again insulation to suit depth - from your info above probably 20mm EPS.

    If the remanents of the bitumin is random bits over the floor then consider using a self leveling compound to give a flat surface to work from.
  3.  
    18mm of insulation is not really enough to make much difference, you might want to go for a higher performance insulation like phenolic (kingspan) or aerogel to make it worthwhile.

    But could you raise the floor by a couple more cm to fit in a bit more insulation? If you taper the 'step' down in doorways then IME it's not noticeable. Is more difficult if there are eg external doors that cannot be trimmed, etc.

    Eg if the existing floor is say U=1.0 W/m²K, then adding 20mm of EPS will only reduce it to U= 0.7. If you could squeeze in 40mm of phenolic you could get U=0.3, which is more pleasant for bare feet!
    • CommentAuthorLF
    • CommentTimeNov 29th 2022
     
    I have always thought that putting insulation around outside of footings outside walls is likely to have more effect on heat loss of parquet floor and does not scrap the flooring. I have similar flooring in most of our house and it is on my radar when re do our refurb. I think most of flooring will only sit on earth at 14 C where as near the walls you have ambient temperature - much colder, so temperature driving force for heat transfer is much higher and heat flow per area is proportionally higher.

    I have never pointed my thermal camera at the floor to see the internal gradient - another task - back to work for now.

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