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Damp Proof Membrane

  • 20-04-2014 8:05pm
    #1
    myshirt
    Registered Users, Registered Users 2 Posts: 5,245 ✭✭✭


    I'm looking to lay some laminate flooring on a concrete subfloor. The house is only 6 years old, so I am assuming the floor already has a dpm. Led to believe it is standard practice on new houses? However, haven't a clue to be honest.

    Also, bought the cheap underlay, 2mil, as the laminate has 'built in' underlay. Am I an idiot?


Comments

  • #2
    galwaydude18
    Registered Users, Registered Users 2 Posts: 3,695 ✭✭✭galwaydude18


    myshirt wrote: »
    I'm looking to lay some laminate flooring on a concrete subfloor. The house is only 6 years old, so I am assuming the floor already has a dpm. Led to believe it is standard practice on new houses? However, haven't a clue to be honest.

    Also, bought the cheap underlay, 2mil, as the laminate has 'built in' underlay. Am I an idiot?

    I never heard of laminate having a built in underlay


  • #3
    myshirt
    Registered Users, Registered Users 2 Posts: 5,245 ✭✭✭myshirt


    galwaydude18 wrote: »
    I never heard of laminate having a built in underlay

    Well, a thin bit of padding glued to the board.

    I got it at €16 a sq mtr, so it's mid range tack. Nothing special


  • #4
    WilyCoyote
    Closed Accounts Posts: 3,059 ✭✭✭WilyCoyote


    myshirt wrote: »
    Well, a thin bit of padding glued to the board.

    I got it at €16 a sq mtr, so it's mid range tack. Nothing special

    myshirt
    Registered User


    Join Date: Nov 2010
    Posts: 666
    Adverts | Friends

    A beast of a post!


  • #5
    RKQ
    Registered Users, Registered Users 2 Posts: 2,292 ✭✭✭RKQ


    A six year old floor should be well dried out by now.
    IMO you don't need a dpc as there should be one in the floor already. The laminate underlay will separate the laminate from the concrete surface anyway. You say there is rubber bonded to the underside of your laminate boards, so this will also prevent contact between the wood and conc.

    Some people do recomment a dpc under laminate. It depends on your wood type, your floor dryness and age.


  • #6
    slimjimmc
    Registered Users, Registered Users 2 Posts: 7,786 ✭✭✭slimjimmc


    Personally I'd feel safer with a dpm if there are any water pipes running underneath. Buried pipes have been known to leak.
    Also, the padding might already serve as a dpm so check the instructions that come with the laminate.


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  • #7
    myshirt
    Registered Users, Registered Users 2 Posts: 5,245 ✭✭✭myshirt


    Thanks guys, I've just put it down with the cheap underlay. I am going to trust the water pipes are dropped enough.

    So the room is 13.5 foot wide, and the length of two boards nearly gave me that, but didn't. About 8mil out on each side. What do I do about that? As to do it the easy way there would be a load of wastage.

    Being the genius I am, I only copped this after pulling off the skirting boards. Should have left them on or put them back on and went with the beading. I just proceeded and put the floor down, but now I'm slightly out.

    I was thinking of putting some 2x1 at the back of the skirting board to bring it out so the room looks tidier.

    I just really don't want to buy beading or new skirting boards. I've also a few marks on the wall from pulling the skirting boards off with the nail bar which the wife is giving out about that I f#cked it all up and should just have got the beading as she only cleaned that wall. So, I've to recover face!


  • #8
    nerrad1983
    Registered Users Posts: 502 ✭✭✭nerrad1983


    myshirt wrote: »
    Thanks guys, I've just put it down with the cheap underlay. I am going to trust the water pipes are dropped enough.

    So the room is 13.5 foot wide, and the length of two boards nearly gave me that, but didn't. About 8mil out on each side. What do I do about that? As to do it the easy way there would be a load of wastage.

    Being the genius I am, I only copped this after pulling off the skirting boards. Should have left them on or put them back on and went with the beading. I just proceeded and put the floor down, but now I'm slightly out.

    I was thinking of putting some 2x1 at the back of the skirting board to bring it out so the room looks tidier.

    I just really don't want to buy beading or new skirting boards. I've also a few marks on the wall from pulling the skirting boards off with the nail bar which the wife is giving out about that I f#cked it all up and should just have got the beading as she only cleaned that wall. So, I've to recover face!

    Just use the off cut from one row to start off the next one mate

    You should have very little waste at all

    Just leave a couple mm gap all round the edges allow for expansion


  • #9
    slimjimmc
    Registered Users, Registered Users 2 Posts: 7,786 ✭✭✭slimjimmc


    nerrad1983 wrote: »
    Just use the off cut from one row to start off the next one mate

    You should have very little waste at all

    Just leave a couple mm gap all round the edges allow for expansion
    OP, Follow the laying instructions included with the laminate, A "couple of mm" is not literally 2mm, it's likely to be closer to 10mm.


  • #10
    whizbang
    Registered Users, Registered Users 2 Posts: 1,946 ✭✭✭whizbang


    Make sure you start the first with a cut piece.
    Cut the first about 1/3rd length, then you need a 2/3rd length for the start of the second row.


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