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Condensation issue in lobby below balcony

  • 19-02-2008 10:37pm
    #1
    gsxr1
    Closed Accounts Posts: 3,167 ✭✭✭


    Hello again.

    My company has recently built 70 appartments and houses in Sallins.

    We are having terrible problems with condensation on the concreate slabs above the ceilings in the lobbies.

    There is no heat in the lobbies. They are vented with a 4 inch hole

    the ceiling is double insulated with king span.

    the small attic space in between the ceiling and precast slab has been vented by me. Drilling a 2 inch hole on each side of the lobby , hoping to get a breeze in there.

    The concrete slab acts as a floor to the second level balcony and is open to the elements.

    there is still heat from the apartment hitting this precast slab and turning into large droplets of water. We have spent 2 weeks insulating tacking and replastering. Followed homebonds advise.

    I am at my wits end. there is water gathering in the ceiling again.


    I was thinking of spray foam on the bottom of the precast slab but have no experience with it.

    Would it be useful in this application.


Comments

  • #2
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    what about your architect ? who is certifying your developments ? I am obviously NOT looking for a name - I mean this is the person you need to turn to now


  • #3
    Builderfromhell
    Registered Users, Registered Users 2 Posts: 1,569 ✭✭✭Builderfromhell


    Sorry to hear you are at your wits end.
    If you could post a detial of the balcony construction I'm sure the many experts will be keen to give an opinion.
    I had similar problem with an insulated cavity wall which was then dry lined by sticking Kingspan composite board (plasterboard on PU) onto inside leaf of cavity. It transpired the condensation resulted from excessive water still in the building evaporating once heating on and condensing evrywhere - mould all over walls. Solution; opened windows with heat on and re-painted. No more condensation.
    agin, I would suggest posting details - you can convert a .dwg file to .pdf file for simpler posting.
    Good luck.


  • #4
    gsxr1
    Closed Accounts Posts: 3,167 ✭✭✭gsxr1


    sinnerboy wrote: »
    what about your architect ? who is certifying your developments ? I am obviously NOT looking for a name - I mean this is the person you need to turn to now

    I dont think he knows whats even going on. I will talk to the boss about that.



    Someone suggested I take up the tiles on the balcony and insulate from the outside. This is starting to go into big money now.


  • #5
    Mellor
    Registered Users, Registered Users 2 Posts: 39,671 ✭✭✭✭Mellor


    There possible a cold bridge where the balcony slab meets the first floor slab or wall. Where the slab is insulated internally, the cold bridge bypasses it into the appartment above.
    This is just speculating from some of your comments, it is impossilbe to know without seeing the detail


  • #6
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    I don't mean to sound disrespectful , but i am finding difficulty with your descriptions . as BFH says if you can post a sketch

    in the meantime however my instinct tells me you need an insulation layer over the slab


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  • #7
    gsxr1
    Closed Accounts Posts: 3,167 ✭✭✭gsxr1


    Mellor wrote: »
    There possible a cold bridge where the balcony slab meets the first floor slab or wall. Where the slab is insulated internally, the cold bridge bypasses it into the appartment above.
    This is just speculating from some of your comments, it is impossilbe to know without seeing the detail

    yeah . It is kinda hard to explain.

    I don't have drawings. Im finishing foremen . Im just left to pick up the mistakes of the trades before me.

    there is an RSJ in the little attic which could be contributing to cold bridging.

    I hope it is just the moisture from the plasterer who was here last week.

    will keep yas posted


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