Laying laminate flooring on concrete

Discussion in 'Subfloor Preparation' started by Jrterror0, Jul 9, 2019.

  1. Jrterror0

    Jrterror0 Member

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    Hi.
    The Mrs has just ordered some laminate flooring for our lounge.
    And she ordered a non barrier underlay.
    The laminate is to be laid on an old concrete floor, (it is NOT freshly laid, it's been down years).
    1. Should we have ordered a barrier underlay?
    In my mind I can't see how effective a barrier underlay would be, unless it was taped at the joints.

    2. Could a one piece polythene sheet be laid below the underlay, instead of buying the more expensive barrier underlay, that she hasn't actually ordered. Ha.

    Many thanks
    D
     
  2. brenchy

    brenchy Well-Known Member

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    yes a 300mu 1200 gauge DPM sheet will do ;)
     
  3. Jrterror0

    Jrterror0 Member

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    Hi. Thanks for the reply.
    Am I right I thinking that these 'barrier' underlays are pointless for the above reasons. Or do the installation instructions say you must tape the joints.
    Ta again
     
  4. d'Arcy

    d'Arcy Well-Known Member

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    Stuff like Barrier Plus has a built in overlap and cloth tape for the joints. It's good stuff.
     
  5. dazlight

    dazlight Super Moderator

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    How old is your house ? Or the concrete floor
     
  6. Jrterror0

    Jrterror0 Member

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    The house is probably 40 years old.
     
  7. Jrterror0

    Jrterror0 Member

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    Hi. Where can I buy the barrier plus underlay in store? Ta
     
  8. d'Arcy

    d'Arcy Well-Known Member

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    We do it in the West Mids, but a fair few should!
     
  9. Jrterror0

    Jrterror0 Member

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    Bought some Barrier plus underlay. But can't find any installation instructions.
    Anyone know of a link?
    Or willing to talk me through the installation.
    Do both the upper and lower overlaps need taping? Should there be s gap between each length. Or just butt them up?
    Ta
     
  10. d'Arcy

    d'Arcy Well-Known Member

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    Is there not a little leaflet in there?
     
  11. Jrterror0

    Jrterror0 Member

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    Yes. I've just checked the back of leaflet
    I've reads "roll out underlay printed side down in direction you'll lay floor covering.

    I thought you lay it at 90 degrees to the laminate
     
  12. AngryAndy

    AngryAndy Well-Known Member

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    I think you'll find that that suggestion was given in jest!!
     
  13. Rugmunching

    Rugmunching Well-Known Member

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    Sod it lay it on the 45 then....best of both worlds lol
     

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