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Cavity trays and pumped insulation

  • 28-12-2012 8:50pm
    #1
    JD6910
    Registered Users, Registered Users 2 Posts: 227 ✭✭


    I am building at the moment and putting a 200mm fully pumped cavity with 100mm block work inner and outer leaf.

    I realise a cavity tray is required where a roof meets a gable wall.

    My query is - can I use a stepped dpc at this junction or do I use the cavity trays that u can buy. Remember this is a fully pumped cavity so will the stepped dpc do the job????

    No probs using the cavity tray but I don't want to install these when a normal stepped dpc would do the same job perhaps????

    The cavity trays will ultimately be filled with bead when I pump the cavity so therefore are they any benefit over the stepped dpc.

    P.s the site is exposed so need to get this right!!!!


Comments

  • #2
    A fella called fish
    Banned (with Prison Access) Posts: 188 ✭✭A fella called fish


    I'm genuinely curious - are you building your own home without the involvement of an Architect and Structural Engineer?


  • #3
    esox28
    Registered Users, Registered Users 2 Posts: 800 ✭✭✭esox28


    Can you post pic of this junction..?


  • #4
    JD6910
    Registered Users, Registered Users 2 Posts: 227 ✭✭JD6910


    I have an engineer on board and we are debating the issue - are cavity trays any use with a fully pumped cavity and won't a stepped dpc do the same job?????


  • #5
    esox28
    Registered Users, Registered Users 2 Posts: 800 ✭✭✭esox28


    I'm not sure if you can get a tray 200mm plus off the shelf. I used dpc above the windows lintel and cut out h d insulation to seal between the lintels from underneath the dpc.


  • #6
    JD6910
    Registered Users, Registered Users 2 Posts: 227 ✭✭JD6910


    esox28 wrote: »
    I'm not sure if you can get a tray 200mm plus off the shelf. I used dpc above the windows lintel and cut out h d insulation to seal between the lintels from underneath the dpc.


    the tray dpes not need to be 200mm. it just needs to extend into the cavity by say 50mm and catch any water that penetrates the outer leaf.

    the question still remains - will the trays work when they are full of bead????


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  • #7
    AnarchistKen
    Registered Users, Registered Users 2 Posts: 129 ✭✭AnarchistKen


    JD6910 wrote: »


    the tray dpes not need to be 200mm. it just needs to extend into the cavity by say 50mm and catch any water that penetrates the outer leaf.

    the question still remains - will the trays work when they are full of bead????

    What finish is going on your external leaf? If your rendering the cavity is sealed completely by the render and the chances of a damp cavity are very small.

    Cavity trays IMO are belts and braces I would personally not go to the expense of buying and installing them


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