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Insulating under ground floor

  • 20-07-2014 4:18pm
    #1
    Smythe
    Registered Users, Registered Users 2 Posts: 434 ✭✭


    I want to have bare floorboards on the ground floor, and was therefore going to insulate under the floorboards.

    Do you think it would be possible to simply lift one floorboard at each of the room and pull insulation along under the boards using, perhaps, string attached to one end?

    That is, rather than having to lift every floorboard?

    Would you suggest any particular type of insulation to use?

    Thanks for any info!


Comments

  • #2
    esox28
    Registered Users, Registered Users 2 Posts: 800 ✭✭✭esox28


    To have contunity of the insulation you will need to remove most of the flooring. Waste of time and money if insulation is not snugly fitted with no gaps.

    Is there a void space beneath flooring joices?


  • #3
    Smythe
    Registered Users, Registered Users 2 Posts: 434 ✭✭Smythe


    esox28 wrote: »
    Is there a void space beneath flooring joices?

    By void space, if you mean a space where someone could get in to work from below, then no.

    If the insulation is of the same depth as the joists (or slightly thicker than the depth of the joists), does this mean potentially the insulation would not have to be attached to the underside of the floorboards since it should fit snugly against them without being attached using a net?


  • #4
    esox28
    Registered Users, Registered Users 2 Posts: 800 ✭✭✭esox28


    Exactly...cut insulation sightly bigger than joists. If you try to think of the insulation as an wind tight barrier, no gaps whatsoever, use expansion foam if required.


  • #5
    Smythe
    Registered Users, Registered Users 2 Posts: 434 ✭✭Smythe


    So if the insulation is slightly thicker than the depth of the joists and therefore does not need to be attached by a net to the underside of the floorboards, does this mean it might be possible to drag the insulation along under the floor through one or two lifted boards at one end of the room using a string/rope which comes out where there is another lifted board at the other end of the room?

    Rather than having to lift all the boards?

    Or would all the boards still have to be lifted for some reason?


  • #6
    esox28
    Registered Users, Registered Users 2 Posts: 800 ✭✭✭esox28


    Well first of all how are you going to attach a string to the insulation?

    Taking that your floor joist are 150mm deep how can you fit insulation under floor boards deeper that 150mm?

    Also the joisting will have knogens every mtr or so which will mean lifting 2-3 boards around the knogens.

    So imo lift the whole floor isn't that big a deal once you get started and no. Them if you need to.


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