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PIR vs. EPS

  • 26-01-2019 9:34am
    #1
    clonagh
    Registered Users Posts: 243 ✭✭


    Hi,
    I'm getting close to point of having to decide on floor insulation for the new house. I'll have 150mm of insulation, under floor heating pipes and 75mm liquid screed on top... I was wondering which is better, PIR or EPS? Thanks.


Comments

  • #2
    893bet
    Registered Users, Registered Users 2 Posts: 9,165 ✭✭✭893bet


    If you are going with 150mm of insulation then you have no choice but to go PIR.


  • #3
    sydthebeat
    Subscribers Posts: 41,863 ✭✭✭✭sydthebeat


    clonagh wrote: »
    Hi,
    I'm getting close to point of having to decide on floor insulation for the new house. I'll have 150mm of insulation, under floor heating pipes and 75mm liquid screed on top... I was wondering which is better, PIR or EPS? Thanks.

    New House build?


  • #4
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,143 Mod ✭✭✭✭BryanF


    New build, with 150mm space, You have no choice, you need PIR to comply.

    Suitable PIR certified for subfloor


  • #5
    sydthebeat
    Subscribers Posts: 41,863 ✭✭✭✭sydthebeat


    clonagh wrote: »
    Hi,
    I'm getting close to point of having to decide on floor insulation for the new house. I'll have 150mm of insulation, under floor heating pipes and 75mm liquid screed on top... I was wondering which is better, PIR or EPS? Thanks.

    Im just seeing now that its a new house build, apologies.

    You can't simply switch different materials.
    They are not the same.
    There's knock on effects of choosing one over the other, but with UFH you're looking at 150 PIR for the most standard situation.


  • #6
    clonagh
    Registered Users Posts: 243 ✭✭clonagh


    Thanks for all the reply's guys.

    Why have I no choice, what's the difference between the two? (Excuse my ignorance...)


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  • #7
    sydthebeat
    Subscribers Posts: 41,863 ✭✭✭✭sydthebeat


    clonagh wrote: »
    Thanks for all the reply's guys.

    Why have I no choice, what's the difference between the two? (Excuse my ignorance...)

    PIR has better insulation values than EPS, approx 30%.

    Therefore in order to get the same end result, you'd have to use approx 30% thicker EPS than PIR, and that has knock on effects to your build


  • #8
    Louth Build
    Registered Users Posts: 6 ✭Louth Build


    I've a similar dilemma. Also with underfloor heating

    Provisional ber specced 140mm of kooltherm giving u value of .12

    When building, subfloor was left lower giving 300mm for insulation and screed.

    I think 225mm of eps can only give .14

    Is combining EPS with pir an issue? I think 125mm EPS with 100mm pir is about .12


  • #9
    sydthebeat
    Subscribers Posts: 41,863 ✭✭✭✭sydthebeat


    Louth Build wrote: »
    I've a similar dilemma. Also with underfloor heating

    Provisional ber specced 140mm of kooltherm giving u value of .12

    When building, subfloor was left lower giving 300mm for insulation and screed.

    I think 225mm of eps can only give .14

    Is combining EPS with pir an issue? I think 125mm EPS with 100mm pir is about .12

    that couldnt possibly be economical.

    figure out the u value you want to reach.... calculate what thickness of each material is required.... and price up each spec.

    would 225 EPS be structurally stable under a 75 mm screed? would it crack the screed?

    with 300mm to play with, you can manipulate both the material thickness and the screed thickness, and even use sand blinding to build up the levels if required.


  • #10
    caddy16
    Registered Users Posts: 720 ✭✭✭caddy16


    Louth Build wrote: »
    I've a similar dilemma. Also with underfloor heating

    Provisional ber specced 140mm of kooltherm giving u value of .12

    When building, subfloor was left lower giving 300mm for insulation and screed.

    I think 225mm of eps can only give .14

    Is combining EPS with pir an issue? I think 125mm EPS with 100mm pir is about .12


    That's exactly what I'm doing combining EPS & PIR. Much more cost effective. Our screed installer has insisted on PIR on top layer as he advised ufh clips can lift from EPS.


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