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Which celotex

Discussion in 'Building' started by 10monty, 27 May 2021.

  1. 10monty

    10monty

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    I have a floating floor over block and beam and need to replace the insulation that the chipboard is sitting on. It's currently 25mm polystyrene. I've been quoted for celitex tb4000 but I'm not certain if that is the best stuff to use. I believe ga4000 might be the better product but I can't find it in 25mm. Anyone know the best stuff for this job please.
     
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  3. Notch7

    Notch7

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    To be honest.....any PIR insulation is fine, whatever brand. (Ectotherm, Celetex, Kingspan, Recticel)

    I've never seen anybody care on building sites, despite architects specifying.

    If there is any actual difference Id be interested to know.
     
  4. Swwils

    Swwils

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    R value is not constant. For instance polyisocyanurate loses effectiveness as it gets cold. Sometimes you can find yourself on the bad side of this, especially if it's going to be under 10C.
     
  5. Notch7

    Notch7

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    I hadn't realised that, thanks.

    I think the 2 celetex products the OP is mentions are both PIR.

    not that 25mm in a floor is anywhere near sufficient.
     
  6. Swwils

    Swwils

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    Yeah bad example with those products that are very similar. I can't see any difference other than the sizes offered.
     
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  8. ^woody^

    ^woody^

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    It's only worth insulating to the same value as the wall either side of it.

    Edit
    LOL; wrong post!
     
    Last edited: 27 May 2021
  9. Notch7

    Notch7

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    I've often wondered about insulation.

    If you insulate just one element, say the floor.....but not walls or ceiling, how much of an improvement do you actually make?

    Is it like security - "only as good as the weakest link".
     
  10. ^woody^

    ^woody^

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    It can be worth insulating whole surfaces and there will be benefits - ceiling most benefit, then walls and least benefit from floors. But for parts of these, there is not much benefit and can lead to a higher condensation or pattern staining risk where adjacent surfaces are significantly different temperatures
     
  11. 10monty

    10monty

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    Thanks for the replies. 25mm is obviously not really sufficient although better than nothing and I can't go thicker without creating a step into the next room as the whole downstairs is 25mm. Our house was built in 85 and the regs obviously weren't as tight then. We don't have a damp proof membrane under the polystyrene currently either.
    My question was more about whether there is any difference in the amount of give or bounce I suppose rather than the insulation properties
     
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