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Cavity insulation

  • 29-08-2016 7:00pm
    #1
    Rossdarragh1
    Registered Users, Registered Users 2 Posts: 94 ✭✭


    I have a 50 mm cavity in my timber frame house. Inside leaf timber , outside block. Today I had my windows installed, with the windows sitting on the cill of the outside block. This leaves the cavity exposed to the inside of the house. What is the best way to ensure I don't lose air out the cavity. I'm putting in an airtightness membrane on the studs and taping them to the window frame , however I'm concerned about the cavity. I can't use the 62.5mm insulated board on the internal reveals as this would cover the window frame.

    The studs are being sprayed. Is spraying the cavity around the window an option ? I looked at 26.5 mm insulated board but that would still take up a lot of my window frame. Obviously the cavity won't be pumped as its a timber frame .


Comments

  • #2
    BryanF
    Moderators, Home & Garden Moderators Posts: 10,146 Mod ✭✭✭✭BryanF


    Should be cavity barriers for start. Further insulation works needs to take account of the timber to vent! Get an arch involved.


  • #3
    Rossdarragh1
    Registered Users, Registered Users 2 Posts: 94 ✭✭Rossdarragh1


    BryanF wrote: »
    Should be cavity barriers for start. Further insulation works needs to take account of the timber to vent! Get an arch involved.

    The studs are taking open cell spray foam allowing the timber to breath. Could I use the same foam just inside the window cavity as a cavity blocker? Or would I have to use an insulated board?

    On another point they say that the spray foam is breathable in the stud but when you fix an air tight membrane onto the stud is your 'breathable' open cell spray foam now defunct?

    On the venting issue the cavity is exposed at attic level and so should allow ventilation.


  • #4
    Calahonda52
    Registered Users, Registered Users 2 Posts: 12,889 ✭✭✭✭Calahonda52


    Op: this is pretty hard to follow:
    is this the same project as these threads started by you.
    http://www.boards.ie/vbulletin/showthread.php?p=100583425
    http://www.boards.ie/vbulletin/showthread.php?p=100804919

    “I can’t pay my staff or mortgage with instagram likes”.



  • #5
    Rossdarragh1
    Registered Users, Registered Users 2 Posts: 94 ✭✭Rossdarragh1


    Yes all related to same build


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